Nils Christopher Gerhardt

Fakultät für Elektrotechnik, Informatik und Mathematik
nils.gerhardt@uni-paderborn.de
ID
115298

184 Publications

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[184]
2025 | Journal Article | LibreCat-ID: 61932
VCSELs: Influence of Design on Performance and Data Transmission over Multi-Mode and Single-Mode Fibers
N.N. Ledentsov, N. Ledentsov, V.A. Shchukin, A.N. Ledentsov, O.Yu. Makarov, I.E. Titkov, M. Lindemann, T. de Adelsburg Ettmayer, N.C. Gerhardt, M.R. Hofmann, X. Chen, J.E. Hurley, H. Dong, M.-J. Li, Photonics 12 (2025).
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[183]
2025 | Journal Article | LibreCat-ID: 61931
Multimode vertical-cavity surface-emitting lasers under spin injection
U. Diiankova, M. Drong, T. Pusch, R. Michalzik, M. Lindemann, N.C. Gerhardt, M.R. Hofmann, APL Photonics 10 (2025).
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[182]
2025 | Journal Article | LibreCat-ID: 64551
Laterally coupled vertical-cavity surface-emitting lasers with tunable resonance width and frequency
M. Lindemann, M. D’Alessandro, N. Ledentsov, O.Y. Makarov, N.N. Ledentsov, A. Tibaldi, N.C. Gerhardt, M.R. Hofmann, Journal of Applied Physics 138 (2025).
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[181]
2025 | Conference Paper | LibreCat-ID: 64293
Quantitative holography for the characterisation of semiconductor amplifieres and lasers
N.C. Gerhardt, M.R. Hofmann, L. Zens, J. Möller, V. Besaga, in: Practical Holography XXXIX: Displays, Materials, and Applications, 2025.
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[180]
2024 | Journal Article | LibreCat-ID: 64550
Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides
L. Zens, V. Besaga, J. Möller, N.C. Gerhardt, M. Hofmann, Optics Express (2024).
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[179]
2024 | Journal Article | LibreCat-ID: 64585
Controlling the helicity of light by electrical magnetization switching
M. Lindemann, N.C. Gerhardt, P.A. Dainone, P. Renucci, A. Bouché, M. Morassi, X. Devaux, J.-M. George, H. Jaffrès, A. Lemaitre, B. Xu, M. Stoffel, T. Chen, L. Lombez, D. Lagarde, G. Cong, T. Ma, P. Pigeat, M. Vergnat, H. Rinnert, X. Marie, X. Han, S. Mangin, J.-C. Rojas-Sánchez, J.-P. Wang, M.C. Beard, I. Žutić, N. Figueiredo Prestes, Y. Lu, Nature 627 (2024) 783–788.
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[178]
2024 | Journal Article | LibreCat-ID: 64549
Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides
L. Zens, V. Besaga, J. Möller, N.C. Gerhardt, M. Hofmann, Optics Express (2024).
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[177]
2024 | Conference Paper | LibreCat-ID: 64296
Study of Electrically Excited Photon-Photon Resonances in Self-Injection-Locked Coupled-Cavity VCSELs
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, N.N. Ledentsov, V.A. Shchukin, O.Y. Makarov, V. Zerova, M. D’alessandro, A. Tibaldi, J.P. Turkiewicz, in: 2024 IEEE 29th International Semiconductor Laser Conference (ISLC), 2024.
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[176]
2024 | Journal Article | LibreCat-ID: 64295
Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides
L. Zens, V. Besaga, J. Möller, N.C. Gerhardt, M.R. Hofmann, Optics Express 33 (2024) 34–49.
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[175]
2024 | Journal Article | LibreCat-ID: 59663
Controlling the helicity of light by electrical magnetization switching
P.A. Dainone, N.F. Prestes, P. Renucci, A. Bouché, M. Morassi, X. Devaux, M. Lindemann, J.-M. George, H. Jaffrès, A. Lemaitre, B. Xu, M. Stoffel, T. Chen, L. Lombez, D. Lagarde, G. Cong, T. Ma, P. Pigeat, M. Vergnat, H. Rinnert, X. Marie, X. Han, S. Mangin, J.-C. Rojas-Sánchez, J.-P. Wang, M.C. Beard, N.C. Gerhardt, I. Žutić, Y. Lu, Nature 627 (2024) 783–788.
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[174]
2024 | Conference Paper | LibreCat-ID: 64298
Analysis of laterally-coupled-cavity VCSELs for ultra-high-frequency photon-photon resonance modulation
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, N. Ledentsov, N.N. Ledentsov, V.A. Shchukin, Ł. Chorchos, O.Y. Makarov, J.R. Kropp, I.E. Titkov, V.P. Kalosha, V. Zerova, M. D’Alessandro, V. Torrelli, A. Tibaldi, P. Debernardi, in: Vertical-Cavity Surface-Emitting Lasers XXVIII, 2024.
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[173]
2023 | Journal Article | LibreCat-ID: 64302
Polarization dynamics in spin‐VCSELs with integrated surface grating for high birefringence splitting
M. Lindemann, N. Jung, N.C. Gerhardt, M.R. Hofmann, N. Manrique‐Nieto, T. Pusch, R. Michalzik, Electronics Letters 59 (2023).
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[172]
2022 | Journal Article | LibreCat-ID: 59668
Spin‐Lasing in Bimodal Quantum Dot Micropillar Cavities
N. Heermeier, T. Heuser, J. Große, N. Jung, A. Kaganskiy, M. Lindemann, N.C. Gerhardt, M.R. Hofmann, S. Reitzenstein, Laser & Photonics Reviews 16 (2022).
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[171]
2022 | Conference Paper | LibreCat-ID: 64306
Spin lasing in high-beta bimodal quantum dot micropillar cavities
N. Heermeier, N. Jung, M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Heuser, J. Große, A. Kaganskiy, S. Reitzenstein, in: Spintronics XV, 2022.
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[170]
2022 | Journal Article | LibreCat-ID: 64307
Investigation of laser-induced periodic surface structures using synthetic optical holography
E.L. Gurevich, M.R. Hofmann, N.C. Gerhardt, K. Neutsch, Nanomaterials 13 (2022).
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[169]
2020 | Journal Article | LibreCat-ID: 59686
Time-resolved photoluminescence characterization of InGaAs/GaAs nano-ridges monolithically grown on 300 mm Si substrates
Y. Shi, L.C. Kreuzer, N.C. Gerhardt, M. Pantouvaki, J. Van Campenhout, M. Baryshnikova, R. Langer, D. Van Thourhout, B. Kunert, Journal of Applied Physics 127 (2020).
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[168]
2020 | Journal Article | LibreCat-ID: 59685
Spin-lasers: spintronics beyond magnetoresistance
I. Žutić, G. Xu, M. Lindemann, P.E. Faria Junior, J. Lee, V. Labinac, K. Stojšić, G.M. Sipahi, M.R. Hofmann, N.C. Gerhardt, Solid State Communications 316–317 (2020).
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[167]
2020 | Journal Article | LibreCat-ID: 59684
Confocal laser scanning holographic microscopy of buried structures
L. Schnitzler, K. Neutsch, F. Schellenberg, M.R. Hofmann, N.C. Gerhardt, Applied Optics 60 (2020).
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[166]
2019 | Conference Paper | LibreCat-ID: 64361
Three-dimensional particle localization with common-path digital holographic microscopy
K. Neutsch, M.R. Hofmann, N.C. Gerhardt, L. Schnitzler, M.J. Tranelis, in: Practical Holography XXXIII: Displays, Materials, and Applications, 2019.
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[165]
2019 | Book Chapter | LibreCat-ID: 64360
Semiconductor spin-lasers
N.C. Gerhardt, I. Žutić, J. Lee, C. Gøthgen, J. Farla, Paulo E., G. Xu, G.M. Sipahi, in: Nanoscale Spintronics and Applications, 2019, pp. 499–540.
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[164]
2019 | Journal Article | LibreCat-ID: 59687
Ultrafast spin-lasers
M. Lindemann, G. Xu, T. Pusch, R. Michalzik, M.R. Hofmann, I. Žutić, N.C. Gerhardt, Nature 568 (2019) 212–215.
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[163]
2018 | Conference Paper | LibreCat-ID: 64371
Brain tissue analysis using texture features based on optical coherence tomography images
M.R. Hofmann, M. Lenz, R. Krug, N.C. Gerhardt, K. Schmieder, C. Dillmann, H. Welp, in: Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXII, 2018.
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[162]
2018 | Conference Paper | LibreCat-ID: 64372
Classification of brain tissue with optical coherence tomography by employing texture analysis
M. Lenz, R. Krug, N.C. Gerhardt, K. Schmieder, M.R. Hofmann, C. Dillmann, H. Welp, in: Optics, Photonics, and Digital Technologies for Imaging Applications V, 2018.
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[161]
2018 | Conference Paper | LibreCat-ID: 64376
Digital holography for the investigation of buried structures with a common-path reflection microscope
M.R. Hofmann, N.C. Gerhardt, M. Finkeldey, L. Göring, in: Practical Holography XXXII: Displays, Materials, and Applications, 2018.
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[160]
2018 | Conference Paper | LibreCat-ID: 64379
Thermally-induced birefringence in VCSELs - approaching the limits
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, S. Scherübl, in: Semiconductor Lasers and Laser Dynamics VIII, 2018.
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[159]
2018 | Conference Paper | LibreCat-ID: 64375
Demonstrating ultrafast polarization dynamics in spin-VCSELs
M. Lindemann, N.C. Gerhardt, M. Hofmann, T. Pusch, R. Michalzik, in: Vertical-Cavity Surface-Emitting Lasers XXII, 2018.
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[158]
2018 | Conference Paper | LibreCat-ID: 64378
Spin lasers for optical data communication
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, R. Michalzik, T. Pusch, in: Semiconductor Lasers and Laser Dynamics VIII, 2018.
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[157]
2018 | Conference Paper | LibreCat-ID: 64377
Electrical birefringence tuning of VCSELs
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, R. Michalzik, T. Pusch, in: Vertical-Cavity Surface-Emitting Lasers XXII, 2018.
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[156]
2018 | Conference Paper | LibreCat-ID: 64374
Common-path digital holographic microscopy for 3D nanoparticle localization
N.C. Gerhardt, K. Neutsch, L. Göring, in: Nanoimaging and Nanospectroscopy VI, 2018.
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[155]
2018 | Conference Paper | LibreCat-ID: 64380
Toward ultrafast spin lasers?
N.C. Gerhardt, G. Xu, I. Žutić, in: APS March Meeting 2018, 2018.
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[154]
2018 | Journal Article | LibreCat-ID: 64370
Automated differentiation between meningioma and healthy brain tissue based on optical coherence tomography ex vivo images using texture features
M. Lenz, R. Krug, N.C. Gerhardt, K. Schmieder, C. Dillmann, R. Stroop, H. Welp, Journal of Biomedical Optics 23 (2018) 071205.
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[153]
2018 | Conference Paper | LibreCat-ID: 64369
A direct-view customer-oriented digital holographic camera
V. Besaga, N.C. Gerhardt, M.R. Hofmann, P.P. Maksimyak, in: Thirteenth International Conference on Correlation Optics, 2018.
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[152]
2017 | Conference Paper | LibreCat-ID: 64402
Spectroscopic optical coherence tomography for ex vivo brain tumor analysis
M. Lenz, R. Krug, A. Gerling, K. Schmieder, M. Hofmann, N.C. Gerhardt, C. Dillmann, H. Welp, in: Advanced Biomedical and Clinical Diagnostic and Surgical Guidance Systems XV, 2017.
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[151]
2017 | Conference Paper | LibreCat-ID: 64399
Multimodal backside imaging of a microcontroller using confocal laser scanning and optical-beam-induced current imaging
M. Finkeldey, L. Göring, F. Schellenberg, C. Brenner, N.C. Gerhardt, M.R. Hofmann, in: Photonic Instrumentation Engineering IV, 2017.
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[150]
2017 | Journal Article | LibreCat-ID: 64401
Optical metrology for the investigation of buried technical structures
M. Finkeldey, F. Schellenberg, C. Brenner, M.R. Hofmann, N.C. Gerhardt, L. Göring, Technisches Messen 85 (2017) 104–110.
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[149]
2017 | Conference Paper | LibreCat-ID: 64398
Linking transducer transfer function with multi-pulse excitation photoacoustic response
M.N. Cherkashin, C. Brenner, W.D. Putro, B. Döpke, N.C. Gerhardt, M.R. Hofmann, in: Medical Imaging 2017: Ultrasonic Imaging and Tomography, 2017.
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[148]
2017 | Conference Paper | LibreCat-ID: 64400
Nondestructive evaluation of protective coatings for the conservation of industrial monuments
M. Lenz, N.C. Gerhardt, M. Prange, M.R. Hofmann, C. Mazzon, C. Dillmann, H. Welp, in: Optics for Arts, Architecture, and Archaeology VI, 2017.
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[147]
2017 | Conference Paper | LibreCat-ID: 64397
Lensless digital holographic microscope using in-line configuration and laser diode illumination
L. Göring, M. Finkeldey, A. Ad­in­da-Oug­ba, N.C. Gerhardt, M. Hofmann, in: Practical Holography XXXI: Materials and Applications, 2017.
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[146]
2017 | Journal Article | LibreCat-ID: 64386
Spectral domain optical coherence tomography for non-destructive testing of protection coatings on metal substrates
M. Lenz, N.C. Gerhardt, M. Hofmann, C. Mazzon, C. Dillmann, H. Welp, M. Prange, Applied Sciences 7 (2017).
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[145]
2017 | Journal Article | LibreCat-ID: 64385
Monolithic vertical-cavity surface-emitting laser with thermally tunable birefringence
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, E. La Tona, Applied Physics Letters 110 (2017).
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[144]
2017 | Conference Paper | LibreCat-ID: 64393
Dynamics of the photoacoustic response of single-element PZT transducers to pulse burst excitation
M.N. Cherkashin, C. Brenner, W.D. Putro, B. Döpke, N.C. Gerhardt, M.R. Hofmann, in: Photons Plus Ultrasound: Imaging and Sensing 2017, 2017.
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[143]
2017 | Journal Article | LibreCat-ID: 64384
Depth-filtering in common-path digital holographic microscopy
M. Finkeldey, L. Göring, C. Brenner, M. Hofmann, N.C. Gerhardt, Optics Express 25 (2017) 19398–19407.
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[142]
2017 | Conference Paper | LibreCat-ID: 64388
Backside imaging of a microcontroller with common-path digital holography
M. Finkeldey, F. Schellenberg, N.C. Gerhardt, M. Hofmann, L. Göring, in: Practical Holography XXXI: Materials and Applications, 2017.
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[141]
2017 | Conference Paper | LibreCat-ID: 64395
Investigations on polarization oscillation amplitudes in spin-VCSELs
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: Vertical-Cavity Surface-Emitting Lasers XXI, 2017.
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[140]
2017 | Conference Paper | LibreCat-ID: 64391
Common-path holographic objective for conventional photographic camera
V. Besaga, N.C. Gerhardt, M.R. Hofmann, P.P. Maksimyak, in: Novel Optical Systems Design and Optimization XX, 2017.
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[139]
2017 | Conference Paper | LibreCat-ID: 64394
High-frequency polarization dynamics in spin-lasers - pushing the limits
M. Lindemann, M.R. Hofmann, N.C. Gerhardt, T. Pusch, R. Michalzik, in: Spintronics X, 2017.
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[138]
2017 | Journal Article | LibreCat-ID: 64403
Thermally induced birefringence tuning of 37 GHz in VCSELs
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, E. La Tona, R. Michalzik, 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC 2017) 1 (2017) 108.
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[137]
2017 | Journal Article | LibreCat-ID: 64392
Digital holographic microscopy of buried specimen using a common-path reflective setup
M. Finkeldey, C. Brenner, N.C. Gerhardt, M.R. Hofmann, L. Göring, DGaO-Proceedings 118 (2017).
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[136]
2016 | Journal Article | LibreCat-ID: 59690
Frequency tuning of polarization oscillations: Toward high-speed spin-lasers
M. Lindemann, T. Pusch, R. Michalzik, N.C. Gerhardt, M.R. Hofmann, Applied Physics Letters 108 (2016).
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[135]
2016 | Preprint | LibreCat-ID: 64425
Large laser spots and fault sensitivity analysis
F. Schellenberg, M. Finkeldey, N.C. Gerhardt, M.R. Hofmann, A. Moradi, C. Paar, (2016).
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[134]
2016 | Journal Article | LibreCat-ID: 64426
Local bi­na­ry pat­terns for dif­fe­ren­tia­ti­on of brain tis­sue types in­op­ti­cal co­he­rence to­mo­gra­phy ima­ges
M. Lenz, R. Krug, N.C. Gerhardt, K. Schmieder, M. Hofmann, C. Dillmann, H. Welp, Biomedical Engineering 61 (2016).
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[133]
2016 | Conference Paper | LibreCat-ID: 64424
Large laser spots and fault sensitivity analysis
F. Schellenberg, M. Finkeldey, N.C. Gerhardt, M.R. Hofmann, A. Moradi, C. Paar, in: 2016 IEEE International Symposium on Hardware Oriented Security and Trust (HOST 2016), 2016, pp. 203–208.
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[132]
2016 | Conference Paper | LibreCat-ID: 64420
Common-path depth-filtered digital holography for high resolution imaging of buried semiconductor structures
M. Finkeldey, F. Schellenberg, N.C. Gerhardt, C. Paar, M. Hofmann, in: Practical Holography XXX: Materials and Applications, 2016.
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[131]
2016 | Conference Paper | LibreCat-ID: 64423
Influence of birefringence splitting on ultrafast polarization oscillations in VCSELs
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: Vertical-Cavity Surface-Emitting Lasers XX, 2016.
LibreCat | DOI
 
[130]
2016 | Conference Paper | LibreCat-ID: 64427
Microscopic description of a spin laser
N.C. Gerhardt, Jr. Faria, Paulo E., G. Xu, J. Lee, G.M. Sipahi, I. Žutić, in: APS March Meeting 2016, 2016.
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[129]
2016 | Conference Paper | LibreCat-ID: 64422
Frequency tuning of polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers
M. Lindemann, M.R. Hofmann, N.C. Gerhardt, T. Pusch, R. Michalzik, in: Semiconductor Lasers and Laser Dynamics VII, 2016.
LibreCat | DOI
 
[128]
2016 | Conference Paper | LibreCat-ID: 64419
Birefringent vertical cavity surface-emitting lasers - toward high-speed spin-lasers
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: Semiconductor Lasers and Laser Dynamics VII, 2016.
LibreCat | DOI
 
[127]
2016 | Conference Paper | LibreCat-ID: 64415
Dynamics of double-pulse photoacoustic excitation
C. Brenner, L. Göring, B. Döpke, M.N. Cherkashin, N.C. Gerhardt, M.R. Hofmann, in: Photons Plus Ultrasound: Imaging and Sensing 2016, 2016.
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[126]
2016 | Journal Article | LibreCat-ID: 64421
Common-path digital holography microscopy of buried semiconductor specimen
L. Göring, M. Finkeldey, N.C. Gerhardt, M.R. Hofmann, Adaptive Optics: Analysis, Methods & Systems (2016).
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[125]
2016 | Conference Paper | LibreCat-ID: 64418
Birefringence tuning of VCSELs
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, M. Bou Sanayeh, R. Mich­al­zik, T. Pusch, in: Semiconductor Lasers and Laser Dynamics VII, 2016.
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[124]
2016 | Conference Paper | LibreCat-ID: 64411
Common-path digital holography microscopy of buried semiconductor specimen
N.C. Gerhardt, M.R. Hofmann, M. Finkeldey, L. Göring, in: 2016.
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[123]
2016 | Conference Paper | LibreCat-ID: 64413
Common-path digital holography microscopy of buried semiconductor specimen
N.C. Gerhardt, M.R. Hofmann, M. Finkeldey, L. Goring, in: 2016.
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[122]
2016 | Conference Paper | LibreCat-ID: 64417
Common-path digital holography microscopy of buried semiconductor specimen
N.C. Gerhardt, M.R. Hofmann, M. Finkeldey, L. Goring, in: 2016.
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[121]
2016 | Conference Paper | LibreCat-ID: 64416
On the complexity reduction of laser fault injection campaigns using OBIC measurements
F. Schellenberg, M. Finkeldey, B. Richter, N.C. Gerhardt, M. Hofmann, C. Paar, M. Schapers, in: 2015 Workshop on Fault Diagnosis and Tolerance in Cryptography - FDTC 2015, 2016, pp. 14–27.
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[120]
2016 | Conference Paper | LibreCat-ID: 64407
High-frequency operation of spin vertical-cavity surface-emitting lasers - towards 100 GHz
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: Spintronics IX, 2016.
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[119]
2016 | Journal Article | LibreCat-ID: 64406
Frequency tuning of polarization oscillations in spin-lasers
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, Spintronics IX (2016).
LibreCat | DOI
 
[118]
2016 | Conference Paper | LibreCat-ID: 64408
Common-path digital holography microscopy of buried semiconductor specimen
N.C. Gerhardt, M.R. Hofmann, M. Finkeldey, L. Göring, in: 2016.
LibreCat | DOI
 
[117]
2016 | Conference Paper | LibreCat-ID: 64409
Common-path digital holography microscopy of buried semiconductor specimen
N.C. Gerhardt, M.R. Hofmann, M. Finkeldey, L. Göring, in: 2016.
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[116]
2016 | Conference Paper | LibreCat-ID: 64410
Common-path digital holography microscopy of buried semiconductor specimen
N.C. Gerhardt, M.R. Hofmann, M. Finkeldey, L. Go, in: 2016.
LibreCat | DOI
 
[115]
2016 | Conference Paper | LibreCat-ID: 64412
Common-path digital holography microscopy of buried semiconductor specimen
N.C. Gerhardt, M.R. Hofmann, M. Finkeldey, L. Göring, in: 2016.
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[114]
2015 | Journal Article | LibreCat-ID: 59691
Toward high-frequency operation of spin lasers
P.E. Faria Junior, G. Xu, J. Lee, N.C. Gerhardt, G.M. Sipahi, I. Žutić, Physical Review B 92 (2015).
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[113]
2015 | Journal Article | LibreCat-ID: 59693
Toward high-frequency operation of spin lasers
P.E. Faria Junior, G. Xu, J. Lee, N.C. Gerhardt, G.M. Sipahi, I. Žutić, Physical Review B 92 (2015).
LibreCat | DOI
 
[112]
2015 | Conference Paper | LibreCat-ID: 64444
Tu­ning the fre­quen­cy of po­la­riza­t­i­on oscil­la­ti­ons in spin VC­SELs by me­cha­ni­cal strain in­duc­tion in GHz-ran­ge
M. Lindemann, N.C. Gerhardt, M. Hofmann, T. Pusch, R. Michalzik, in: The European Conference on Lasers and Electro-Optics 2015, 2015.
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[111]
2015 | Conference Paper | LibreCat-ID: 64441
Increasing the birefringence of VCSELs beyond 250 GHz
M. Lindemann, N.C. Gerhardt, M. Hofmann, T. Pusch, R. Michalzik, in: The European Conference on Lasers and Electro-Optics 2015, 2015.
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[110]
2015 | Preprint | LibreCat-ID: 64442
On the complexity reduction of laser fault injection campaigns using OBIC measurements
F. Schellenberg, M. Finkeldey, B. Richter, N.C. Gerhardt, M.R. Hofmann, C. Paar, M. Schäpers, (2015).
LibreCat
 
[109]
2015 | Journal Article | LibreCat-ID: 64430
Simple concept for a wide-field lensless digital holographic microscope using a laser diode
A. Ad­in­da-Oug­ba, N. Koukourakis, N.C. Gerhardt, M. Hofmann, Current Directions in Biomedical Engineering 1 (2015) 261–264.
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[108]
2015 | Conference Paper | LibreCat-ID: 64432
Laser-diode-based photoacoustic setup to analyze Grüneisen relaxation-effect induced signal enhancement
M.N. Cherkashin, C. Brenner, L. Schnitzler, B. Döpke, N.C. Gerhardt, M. Hofmann, in: Opto-Acoustic Methods and Applications in Biophotonics II, 2015.
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[107]
2015 | Conference Paper | LibreCat-ID: 64436
Ultrafast polarization dynamics with controlled polarization oscillations in vertical-cavity surface-emitting lasers
M. Lindemann, H. Höpfner, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: Vertical-Cavity Surface-Emitting Lasers XIX, 2015, pp. 1–7.
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[106]
2015 | Conference Paper | LibreCat-ID: 64443
Towards high frequency operation of polarization oscillations in spin vertical-cavity surface-emitting lasers
M. Lindemann, H. Höpfner, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: Spintronics VIII, 2015.
LibreCat | DOI
 
[105]
2015 | Journal Article | LibreCat-ID: 64435
Controlling the frequency of ultra-fast polarization oscillations in Spin-VCSELs
M. Lindemann, H. Höpfner, N.C. Gerhardt, M. Hofmann, T. Pusch, R. Michalzik, 79. Jahrestagung Der DPG Und DPG-Frühjahrstagung (2015).
LibreCat
 
[104]
2015 | Conference Paper | LibreCat-ID: 64440
Tuning the frequency of polarization oscillations in spin-VCSELs by mechanical strain induction
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: 2015.
LibreCat
 
[103]
2015 | Conference Paper | LibreCat-ID: 64437
Increasing the birefringence of VCSELs beyond 250 GHz
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: 2015.
LibreCat
 
[102]
2015 | Conference Paper | LibreCat-ID: 64429
Compact low-cost lensless digital holographic microscope for topographic measurements of microstructures in reflection geometry
A. Ad­in­da-Oug­ba, N. Koukourakis, F. Mitschker, N.C. Gerhardt, M. Hofmann, B. Kabir, in: Optical Systems Design 2015, 2015, pp. 1–8.
LibreCat | DOI
 
[101]
2015 | Conference Paper | LibreCat-ID: 64433
Quantitative phase imaging by wide field lensless digital holographic microscope
A. Ad­in­da-Oug­ba, N. Koukourakis, A. Essaidi, N.C. Gerhardt, M. Hofmann, in: Optical Methods for Inspection, Characterization, and Imaging of Biomaterials II, 2015, p. 952903.
LibreCat | DOI
 
[100]
2015 | Journal Article | LibreCat-ID: 64428
Vertical-cavity surface-emitting lasers with birefringence splitting above 250 GHz
M. Lindemann, N.C. Gerhardt, M. Hofmann, T. Pusch, R. Michalzik, Electronics Letters 51 (2015) 1600–1601.
LibreCat | DOI
 
[99]
2015 | Conference Paper | LibreCat-ID: 64431
Controlled switching and frequency tuning of polarization oscillations in vertical-cavity surface-emitting lasers
M. Lindemann, H. Höpfner, N.C. Gerhardt, M. Hofmann, T. Pusch, R. Michalzik, in: Spintronics VIII, 2015, pp. 1–5.
LibreCat | DOI
 
[98]
2015 | Conference Paper | LibreCat-ID: 64439
Tuning the frequency of polarization oscillations in Spin-VCSELs by mechanical strain induction
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: 2015.
LibreCat
 
[97]
2015 | Conference Paper | LibreCat-ID: 64438
Increasing the birefringence of VCSELs beyond 250 GHz
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: 2015.
LibreCat
 
[96]
2014 | Conference Paper | LibreCat-ID: 64453
Performance comparison of different metrics for spectroscopic optical coherence tomography
V. Jaedicke, S. Agcaer, N.C. Gerhardt, M. Hofmann, F.E. Robles, M. Steinert, D. Jones, S. Goebel, H. Welp, in: Biomedical Applications of Light Scattering VIII, 2014, pp. 1–10.
LibreCat | DOI
 
[95]
2014 | Conference Paper | LibreCat-ID: 64451
Effects of axial scanning in confocal microscopy employing adaptive lenses (CAL)
N. Koukourakis, M. Finkeldey, N.C. Gerhardt, M. Hofmann, M. Stürmer, U. Wallrabe, J. Czarske, A. Fischer, in: Optical Micro- and Nanometrology V, 2014.
LibreCat | DOI
 
[94]
2014 | Journal Article | LibreCat-ID: 64448
Axial scanning in confocal microscopy employing adaptive lenses (CAL)
N. Koukourakis, M. Finkeldey, N.C. Gerhardt, M.R. Hofmann, A. Fischer, M. Stürmer, C. Leithold, U. Wallrabe, J.W. Czarske, Optics Express 22 (2014) 6025–6039.
LibreCat | DOI
 
[93]
2014 | Journal Article | LibreCat-ID: 64450
Controlled switching of ultrafast circular polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers
H. Höpfner, M. Lindemann, N.C. Gerhardt, M. Hofmann, Applied Physics Letters 104 (2014) 1–5.
LibreCat | DOI
 
[92]
2014 | Journal Article | LibreCat-ID: 64452
Multiwavelength phase unwrapping and aberration correction using depth filtered digital holography
N. Koukourakis, N.C. Gerhardt, M.R. Hofmann, V. Jädicke, S. Göbel, H. Welp, Optics Letters 39 (2014) 4160–4163.
LibreCat | DOI
 
[91]
2014 | Conference Paper | LibreCat-ID: 64449
Coherent switching of polarization oscillations in vertical-cavity surface-emitting lasers
H. Höpfner, M. Lindemann, N.C. Gerhardt, M. Hofmann, in: Vertical-Cavity Surface-Emitting Lasers XVIII, 2014, pp. 9001–15.
LibreCat | DOI
 
[90]
2014 | Conference Paper | LibreCat-ID: 64447
Spin-controlled ultrafast vertical-cavity surface-emitting lasers
H. Höpfner, M. Lindemann, N.C. Gerhardt, M.R. Hofmann, in: Semiconductor Lasers and Laser Dynamics VI, 2014, pp. 1–6.
LibreCat | DOI
 
[89]
2014 | Conference Paper | LibreCat-ID: 64445
Polarization dynamics in spin-polarized vertical-cavity surface-emitting lasers
N.C. Gerhardt, H. Höpfner, M. Lindemann, M.R. Hofmann, in: Spintronics VII, 2014, pp. 1–10.
LibreCat | DOI
 
[88]
2014 | Journal Article | LibreCat-ID: 64446
Employing electrically tunable lenses in confocal microscopy for axial scanning
N. Koukourakis, M. Finkeldey, N.C. Gerhardt, M. Hofmann, M. Stürmer, C. Leithold, U. Wallrabe, J.W. Czarske, International C for Optics. Congress (2014).
LibreCat
 
[87]
2013 | Journal Article | LibreCat-ID: 64466
Spin relaxation in spin light-emitting diodes - effects of magnetic field and temperature
H. Höpfner, A. Ludwig, A. Ludwig, D. Reuter, A. Wieck, N.C. Gerhardt, M. Hofmann, C. Fritsche, F. Stromberg, H. Wende, W. Keune, Ultrafast Phenomena and Nanophotonics XVII (2013) 86230A–1.
LibreCat | DOI
 
[86]
2013 | Conference Paper | LibreCat-ID: 64460
Optical gain and lasing in GaNAsP/BGa(As)P heterostructures grown on (001) silicon substrate
M. Finkeldey, N. Koukourakis, N.C. Gerhardt, M.R. Hofmann, M. Zimprich, K. Volz, W. Stolz, in: DPG-Frühjahrstagung (DPG Spring Meeting) of the Condensed Matter Section with Its Divisions Biological Physics, Chemical and Polymer Physics, Crystallography, Dielectric Solids, Dynamics and Statistical Physics, Low Temperature Physics, Magnetism, Metal and Material Physics, Physics of Socio-Economic Systems, Semiconductor Physics, Surface Science, Thin Films, Vacuum Science and Technology Together with the Divions Microprobes, and Radiation and Medical Physics as Well as the Working Groups Industry and Business, and “Young DPG,” 2013.
LibreCat
 
[85]
2013 | Conference Paper | LibreCat-ID: 64464
Spin injection and spin relaxation: magnetic field effects
H. Höpfner, A. Ludwig, D. Reuter, A. Wieck, N.C. Gerhardt, M.R. Hofmann, C. Fritsche, F. Stromberg, H. Wende, W. Keune, in: DPG-Frühjahrstagung (DPG Spring Meeting) of the Condensed Matter Section with Its Divisions Biological Physics, Chemical and Polymer Physics, Crystallography, Dielectric Solids, Dynamics and Statistical Physics, Low Temperature Physics, Magnetism, Metal and Material Physics, Physics of Socio-Economic Systems, Semiconductor Physics, Surface Science, Thin Films, Vacuum Science and Technology Together with the Divions Microprobes, and Radiation and Medical Physics as Well as the Working Groups Industry and Business, and “Young DPG,” 2013.
LibreCat
 
[84]
2013 | Conference Paper | LibreCat-ID: 64456
Spectral analysis and spectroscopic metrics in Spectroscopic Optical Coherence Tomography
N.C. Gerhardt, M.R. Hofmann, V. Jaedicke, S. Aǧcaer, S. Goebel, H. Welp, in: 2013.
LibreCat | DOI
 
[83]
2013 | Conference Paper | LibreCat-ID: 64459
Non-exponential photoluminescence transients in GaNAsP lattice matched to (001) silicon substrate
N.C. Gerhardt, N. Koukourakis, M. Finkeldey, M. Hofmann, B. Kunert, M. Zimprich, K. Volz, W. Stolz, K. Jandieri, F. Gebhard, S. Baranovskii, in: DPG-Frühjahrstagung (DPG Spring Meeting) of the Condensed Matter Section with Its Divisions Biological Physics, Chemical and Polymer Physics, Crystallography, Dielectric Solids, Dynamics and Statistical Physics, Low Temperature Physics, Magnetism, Metal and Material Physics, Physics of Socio-Economic Systems, Semiconductor Physics, Surface Science, Thin Films, Vacuum Science and Technology Together with the Divions Microprobes, and Radiation and Medical Physics as Well as the Working Groups Industry and Business, and “Young DPG,” 2013.
LibreCat
 
[82]
2013 | Journal Article | LibreCat-ID: 64467
Spin relaxation length in quantum dot spin LEDs
H. Höpfner, A. Ludwig, A. Ludwig, D. Reuter, A. Wieck, N.C. Gerhardt, M. Hofmann, C. Fritsche, F. Stromberg, H. Wende, W. Keune, Physica Status Solidi 10 (2013) 1214–1217.
LibreCat | DOI
 
[81]
2013 | Conference Paper | LibreCat-ID: 64468
Ultrafast spin-polarized vertical-cavity surface-emitting lasers
N.C. Gerhardt, H. Höpfner, M. Lindemann, M. Li, H. Jähme, M. Hofmann, T. Ackemann, in: Spintronics VI, 2013, pp. 8313–80.
LibreCat | DOI
 
[80]
2013 | Journal Article | LibreCat-ID: 64455
Nonexponential photoluminescence transients in a Ga(NAsP) lattice matched to a (001) silicon substrate
N. Koukourakis, N.C. Gerhardt, M. Hofmann, B. Kunert, S. Liebich, M. Zimprich, K. Volz, W. Stolz, F. Gebhard, S.D. Baranovskii, K. Jandieri, Physical Review 87 (2013).
LibreCat | DOI
 
[79]
2013 | Journal Article | LibreCat-ID: 64457
Comparison of different metrics for analysis and visualization in spectroscopic optical coherence tomography
V. Jaedicke, N.C. Gerhardt, M. Hofmann, S. Agcaer, F.E. Robles, M. Steinert, D. Jones, S. Goebel, H. Welp, Biomedical Optics Express 4 (2013) 2945–2961.
LibreCat | DOI
 
[78]
2013 | Conference Paper | LibreCat-ID: 64461
Quantitative phase analysis through scattering media by depth-filtered digital holography
V. Jaedicke, N. Koukourakis, A. Ad­in­da-Oug­ba, N.C. Gerhardt, M. Hofmann, S. Goebel, H. Wiethoff, H. Welp, C.J. Cogswell, T.G. Brown, J.-A. Conchello, T. Wilson, in: Three-Dimensional and Multidimensional Microscopy, 2013, pp. 85891J-85891J–8.
LibreCat | DOI
 
[77]
2013 | Journal Article | LibreCat-ID: 64458
Contrast enhancement methods in optical coherence tomography using spectral features
V. Jaedicke, N.C. Gerhardt, M. Hofmann, S. Agcaer, S. Goebel, H. Welp, Biomedical Engineering 58 (2013) 1–2.
LibreCat | DOI
 
[76]
2013 | Book Chapter | LibreCat-ID: 64462
Quantum dot spintronics - fundamentals and applications
A. Ludwig, H. Höpfner, N.C. Gerhardt, J. König, M.R. Hofmann, A. Wieck, B. Sothmann, J. Nannen, T. Kümmell, G. Bacher, in: Magnetic Nanostructures, 2013, pp. 235–268.
LibreCat | DOI
 
[75]
2013 | Dissertation | LibreCat-ID: 64454
"More than Moore" - novel photonic concepts for information technology
N.C. Gerhardt, F. für Elektrotechnik und Informationstechnik, “More than Moore” - Novel Photonic Concepts for Information Technology, 2013.
LibreCat
 
[74]
2013 | Conference Paper | LibreCat-ID: 64465
Spin injection, transport, and relaxation in spin light-emitting diodes - magnetic field effects
H. Höpfner, A. Ludwig, A. Ludwig, D. Reuter, A. Wieck, N.C. Gerhardt, M. Hofmann, C. Fritsche, F. Stromberg, H. Wendes, W. Keunes, in: Spintronics VI, 2013, pp. 8813–43.
LibreCat | DOI
 
[73]
2012 | Conference Paper | LibreCat-ID: 64476
Photoluminescence and optical gain of Ga(NAsP) heterostructures pseudomorphically grown on silicon (001) substrate
N. Koukourakis, D. Funke, N.C. Gerhardt, M.R. Hofmann, M. Klimasch, S. Liebich, M. Zimprich, B. Kunert, K. Volz, W. Stolz, J. Kubby, G.T. Reed, in: Silicon Photonics VII, 2012, pp. 1–6.
LibreCat | DOI
 
[72]
2012 | Conference Paper | LibreCat-ID: 64477
Room temperature spin relaxation in quantum dot based spin-optoelectronic devices
H. Höpfner, M. Li, A. Ludwig, A. Ludwig, D. Reuter, A. Wieck, N.C. Gerhardt, M. Hofmann, F. Stromberg, H. Wende, W. Keune, in: Ultrafast Phenomena and Nanophotonics XVI, 2012, pp. 1–7.
LibreCat | DOI
 
[71]
2012 | Journal Article | LibreCat-ID: 64485
Time-resolved photoluminescence and optical gain in Ga(NAsP) pseudomorphically grown on silicon
N. Koukourakis, N.C. Gerhardt, M.R. Hofmann, M. Klimasch, S. Liebich, D. Trusheim, M. Zimprich, K. Volz, W. Stolz, B. Kunert, 76th Jahrestagung Der DPG (76th Annual Conference of the DPG) and DPG-Frühjahrstagung (Spring Meeting) of the Condensed Matter Section (SKM) with Further DPG Divisions: Environmental Physics, Microprobes, Radiation and Medical Physics, as Well as the DPG Working Groups: Energy, Equal Opportunities, Industry and Business, Information, Philosophy of Physics, Physics and Disarmament, Young DPG (2012).
LibreCat
 
[70]
2012 | Journal Article | LibreCat-ID: 64483
Temperature dependence of the spin relaxation length in spin quantum dot LEDs
H. Höpfner, A. Ludwig, A. Ebbing, D. Reuter, A. Wieck, N.C. Gerhardt, M.R. Hofmann, F. Stromberg, H. Wende, W. Keune, C. Fritsche, 76th Jahrestagung Der DPG (76th Annual Conference of the DPG) and DPG-Frühjahrstagung (Spring Meeting) of the Condensed Matter Section (SKM) with Further DPG Divisions: Environmental Physics, Microprobes, Radiation and Medical Physics, as Well as the DPG Working Groups: Energy, Equal Opportunities, Industry and Business, Information, Philosophy of Physics, Physics and Disarmament, Young DPG (2012).
LibreCat
 
[69]
2012 | Journal Article | LibreCat-ID: 64482
System development for spectroscopic optical coherence tomography
V. Jaedicke, S. Agcaer, N.C. Gerhardt, M. Hofmann, S. Goebel, H. Wiethoff, H. Welp, Biomedical Engineering 57 (2012) 327.
LibreCat | DOI
 
[68]
2012 | Journal Article | LibreCat-ID: 64481
Spin-controlled vertical-cavity surface-emitting lasers
N.C. Gerhardt, M. Hofmann, Advances in Optical Technologies (2012) 268949-1-268949–15.
LibreCat | DOI
 
[67]
2012 | Conference Paper | LibreCat-ID: 64470
Analysis of birefringence controlled ultrafast polarization oscillations in spin vertical-cavity surface-emitting lasers
M. Li, N.C. Gerhardt, M. Hofmann, T. Ackemann, in: EOS Annual Meeting 2012 (EOSAM 2012), 2012, pp. 104–107.
LibreCat
 
[66]
2012 | Journal Article | LibreCat-ID: 64480
Spin relaxation dynamics in spin-LEDs
H. Höpfner, A. Ludwig, D. Reuter, A. Wieck, N.C. Gerhardt, M.R. Hofmann, C. Fritsche, F. Stromberg, H. Wende, W. Keune, 76th Jahrestagung Der DPG (76th Annual Conference of the DPG) and DPG-Frühjahrstagung (Spring Meeting) of the Condensed Matter Section (SKM) with Further DPG Divisions: Environmental Physics, Microprobes, Radiation and Medical Physics, as Well as the DPG Working Groups: Energy, Equal Opportunities, Industry and Business, Information, Philosophy of Physics, Physics and Disarmament, Young DPG (2012).
LibreCat
 
[65]
2012 | Journal Article | LibreCat-ID: 64472
Erratum: “Room temperature spin relaxation length in spin light-emitting diodes” - [Appl. Phys. Lett. 99, 051102 (2011)]
H. Soldat, M. Li, N.C. Gerhardt, M. Hofmann, A. Ludwig, A. Ebbing, D. Reuter, A. Wieck, F. Stromberg, W. Keune, H. Wende, Applied Physics Letters 100 (2012) 269902–1.
LibreCat | DOI
 
[64]
2012 | Journal Article | LibreCat-ID: 64473
High room-temperature optical gain in Ga(NAsP)/Si heterostructures
N. Koukourakis, N.C. Gerhardt, M. Hofmann, C. Bückers, D.A. Funke, S. Liebich, S.N. Chatterjee, C. Lange, M. Zimprich, K. Volz, W. Stolz, B. Kunert, S.W. Koch, Applied Physics Letters 100 (2012) 092107-1-092107–3.
LibreCat | DOI
 
[63]
2012 | Journal Article | LibreCat-ID: 64474
Magnetic field dependence of the spin relaxation length in spin light-emitting diodes
H. Höpfner, A. Ludwig, A. Ludwig, D. Reuter, A. Wieck, N.C. Gerhardt, M. Hofmann, C. Fritsche, F. Stromberg, H. Wende, W. Keune, Applied Physics Letters 101 (2012) 112402-1-112402–4.
LibreCat | DOI
 
[62]
2012 | Journal Article | LibreCat-ID: 64471
Depth-filtered digital holography
N. Koukourakis, V. Jaedicke, A. Ad­in­da-Oug­ba, N.C. Gerhardt, M. Hofmann, S. Goebel, H. Wiethoff, H. Höpfner, Optics Express 20 (2012) 22636–22648.
LibreCat | DOI
 
[61]
2012 | Conference Paper | LibreCat-ID: 64478
Signal processing for spectroscopic optical coherence tomography
V. Jaedicke, S. Agcaer, C.T. Kasseck, N.C. Gerhardt, M. Hofmann, S. Goebel, H. Welp, in: Proceedings of the 7th International Workshop on Biosignal Interpretation (BSI2012), 2012, pp. 224–227.
LibreCat
 
[60]
2012 | Journal Article | LibreCat-ID: 64475
Multispectral photoacoustic coded excitation using pseudorandom codes - 82231E
M. Beckmann, C.-S. Friedrich, M. Mienkina, N.C. Gerhardt, M. Hofmann, G. Schmitz, Photons plus Ultrasound (2012) 82231E-1-82231E–8.
LibreCat | DOI
 
[59]
2011 | Conference Paper | LibreCat-ID: 64497
Time-resolved photoluminescence and optical gain of Ga(NAsP) heterostructures pseudomorphically grown on silicon (001) substrate
N.C. Gerhardt, N. Koukourakis, D. Funke, M.R. Hofmann, M. Klimasch, B. Kunert, S. Liebich, D. Trusheim, M. Zimprich, K. Volz, W. Stolz, in: 2011 13th International Conference on Transparent Optical Networks (ICTON 2011), 2011, pp. 111–114.
LibreCat | DOI
 
[58]
2011 | Conference Paper | LibreCat-ID: 64494
Photoacoustic coded excitation using periodically perfect sequences
M. Beckmann, M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, M. Hofmann, G. Schmitz, in: 2011 IEEE International Ultrasonics Symposium (IUS 2011), 2011, pp. 1179–1182.
LibreCat | DOI
 
[57]
2011 | Conference Paper | LibreCat-ID: 64486
Modal gain and time-resolved photoluminescence of Ga(NAsP) heterostructures pseudomorphically grown on Silicon (001) substrate
N.C. Gerhardt, M.R. Hofmann, N. Koukourakis, D.A. Funke, B. Kunert, S. Liebich, D. Trusheim, M. Zimprich, C. Bückers, S.W. Koch, K. Volz, W. Stolz, in: 2011.
LibreCat
 
[56]
2011 | Conference Paper | LibreCat-ID: 64487
Modal gain and time-resolved photoluminescence of Ga(NAsP) heterostructures pseudomorphically grown on silicon (001) substrate
N.C. Gerhardt, M.R. Hofmann, N. Koukourakis, D.A. Funke, B. Kunert, S. Liebich, D. Trusheim, M. Zimprich, C. Bückers, S.W. Koch, K. Volz, W. Stolz, in: 2011.
LibreCat
 
[55]
2011 | Conference Paper | LibreCat-ID: 64496
Quantitative photoacoustic blood oxygenation measurement of whole porcine blood samples using a multi-wavelength semiconductor laser system
C.-S. Friedrich, M. Mienkina, N.C. Gerhardt, M. Beckmann, G. Schmitz, M.R. Hofmann, C. Brenner, M. Jörger, A. Strauß, in: Diffuse Optical Imaging III, 2011, pp. 1–9.
LibreCat | DOI
 
[54]
2011 | Journal Article | LibreCat-ID: 64495
Photorefractive two-wave mixing for image amplification in digital holography
N. Koukourakis, M. Li, R.Y.W. Lai, C. Brenner, N.C. Gerhardt, M. Hofmann, T. Abdelwahab, H. Höpfner, E. Darakis, Optics Express 19 (2011) 22004–22023.
LibreCat | DOI
 
[53]
2011 | Conference Paper | LibreCat-ID: 64493
Ex­pe­ri­men­tal eva­lua­ti­on of mul­tis­pec­tral pho­toa­coustic coded ex­ci­ta­ti­on using or­tho­go­nal uni­po­lar golay codes
M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, M. Hofmann, G. Schmitz, A. Eder, in: 442. Wilhelm Und Else Heraeus-Seminar “Molecular Imaging” in Bad Honnef, October 5th - 8th, 2009, 2011.
LibreCat
 
[52]
2011 | Conference Paper | LibreCat-ID: 64488
Modal gain and time-resolved photoluminescence of Ga(NAsP) heterostructures pseudomorphically grown on silicon (001) substrate
N.C. Gerhardt, M.R. Hofmann, N. Koukourakis, D.A. Funke, B. Kunert, S. Liebich, D. Trusheim, M. Zimprich, C. Bückers, S.W. Koch, K. Volz, W. Stolz, in: 2011.
LibreCat
 
[51]
2011 | Conference Paper | LibreCat-ID: 64489
Quantitative photoacoustic blood oxygenation measurement of whole porcine blood samples using a multi-wavelength semiconductor laser system
C. Brenner, N.C. Gerhardt, M.R. Hofmann, G. Schmitz, C.-S. Friedrich, M.P. Mienkina, M.F. Beckmann, M. Jörger, A. Strauß, in: 2011.
LibreCat
 
[50]
2011 | Conference Paper | LibreCat-ID: 64491
Modal gain and time-resolved photoluminescence of Ga(NAsP) heterostructures pseudomorphically grown on silicon (001) substrate
N.C. Gerhardt, M.R. Hofmann, N. Koukourakis, D.A. Funke, B. Kunert, S. Liebich, D. Trusheim, M. Zimprich, C. Buckers, S.W. Koch, K. Volz, W. Stolz, in: 2011.
LibreCat
 
[49]
2011 | Conference Paper | LibreCat-ID: 64490
Spectroscopic optical coherence tomography for substance identification
N.C. Gerhardt, M.R. Hofmann, V. Jaedicke, C. Kasseck, H. Wiethoff, S. Agcaer, H. Welp, in: 2011.
LibreCat
 
[48]
2011 | Journal Article | LibreCat-ID: 64492
Birefringence and spin controlled ultrafast polarization oscillations in vertical-cavity surface-emitting lasers
M. Li, H. Jähme, H. Soldat, N.C. Gerhardt, M. Hofmann, T. Ackemann, 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO Europe/EQEC 2011) (2011) 109.
LibreCat | DOI
 
[47]
2010 | Journal Article | LibreCat-ID: 64505
Multispectral photoacoustic coded excitation imaging using unipolar orthogonal Golay codes
M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, M.F. Schiffner, M. Hofmann, G. Schmitz, M.F. Beckmann, Optics Express 18 (2010) 9076–9087.
LibreCat | DOI
 
[46]
2010 | Journal Article | LibreCat-ID: 64502
Integrity of micro-hotplates during high-temperature operation monitored by digital holographic microscopy
R.Y.W. Lai, N. Koukourakis, N.C. Gerhardt, S. Hamann, M. Ehmann, K. Hackl, A. Ludwig, R. Meyer, M.R. Hofmann, E. Darakis, Journal of Microelectromechanical Systems 19 (2010) 1175–1179.
LibreCat | DOI
 
[45]
2010 | Journal Article | LibreCat-ID: 64500
Experimental evaluation of photoacoustic coded excitation using unipolar golay codes
M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, W.G. Wilkening, M. Hofmann, G. Schmitz, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 57 (2010) 1583–1593.
LibreCat | DOI
 
[44]
2010 | Conference Paper | LibreCat-ID: 64501
Gigahertz circular polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers
N.C. Gerhardt, M. Li, H. Jähme, H. Soldat, M.R. Hofmann, T. Ackemann, in: Conference on Lasers and Electro-Optics (CLEO) and Quantum Electronics and Laser Science Conference (QELS), 2010, 2010, pp. 1–2.
LibreCat | DOI
 
[43]
2010 | Conference Paper | LibreCat-ID: 64503
Modal gain analysis of GaNAsP heterostructures on silicon
N. Koukourakis, D. Funke, N.C. Gerhardt, M. Hofmann, B. Kunert, S. Liebich, S. Zinnkann, M. Zimprich, A. Beyer, S. Chatterjee, C. Bückers, S.W. Koch, K. Volz, W. Stolz, in: Frontiers in Optics, 2010.
LibreCat | DOI
 
[42]
2010 | Conference Paper | LibreCat-ID: 64506
Substance identification in spectroscopic optical coherence tomograhpy using pattern recognition
V. Jaedicke, C.T. Kasseck, N.C. Gerhardt, M. Hofmann, H. Welp, in: Frontiers in Optics, 2010.
LibreCat | DOI
 
[41]
2010 | Conference Paper | LibreCat-ID: 64499
Photorefractive two-wave mixing for image amplification in digital holography
N.C. Gerhardt, M.R. Hofmann, N. Koukourakis, Y.W. Lai, in: 2010.
LibreCat | DOI
 
[40]
2010 | Conference Paper | LibreCat-ID: 64504
Monospectral photoacoustic imaging using Legendre sequences
M. Beckmann, M. Mienkina, G. Schmitz, C.-S. Friedrich, N.C. Gerhardt, M.R. Hofmann, in: 2010 IEEE International Ultrasonics Symposium (IUS), 2010, pp. 386–389.
LibreCat | DOI
 
[39]
2010 | Conference Paper | LibreCat-ID: 64498
Modal gain analysis of GaNAsP heterostructures on silicon
N.C. Gerhardt, M.R. Hofmann, N. Koukourakis, D.A. Funke, B. Kunert, S. Liebich, S. Zinnkann, M. Zimprich, A. Beyer, S. Chatterjee, C. Bückers, S.W. Koch, K. Volz, W. Stolz, in: 2010.
LibreCat
 
[38]
2009 | Journal Article | LibreCat-ID: 64520
Op­ti­cal ve­ri­fi­ca­ti­on of gain in Ga(NAsP)/(BGa)(AsP) mul­ti-quan­tum-well he­te­rost­ruc­tu­res mo­no­li­thi­cal­ly grown lat­ti­ce-mat­ched on (001) si­li­con sub­stra­te
N.C. Gerhardt, N. Koukourakis, M. Hofmann, B. Kunert, I. Nemeth, S. Zinnkann, G. Lukin, T.B. Adams, R. Fritz, K. Volz, W. Stolz, C. Lange, N.S. Koester, D.J. Franzbach, S.N. Chatterjee, W.W. Rühle, Papers Presented at the 35th International Symposium on Compound Semiconductors (ISCS 2008), Rust, Germany, 21 - 24 September 2008 (2009) 1349–1523.
LibreCat
 
[37]
2009 | Conference Paper | LibreCat-ID: 64514
Gain characteristics and lasing of Ga(NAsP) multi-quantum well structures
N.C. Gerhardt, M. Hofmann, C. Lange, S.N. Chatterjee, B. Kunert, K. Volz, W. Stolz, W.W. Rühle, in: Papers Presented at the 9th International Workshop on Nonlinear Optics and Excitation Kinetics in Semiconductors (NOEKS 9), 2009, pp. 576–578.
LibreCat | DOI
 
[36]
2009 | Conference Paper | LibreCat-ID: 64519
New concepts for depth resolved holographic imaging based on spectrally tunable diode lasers
N. Koukourakis, C. Kasseck, N.C. Gerhardt, M. Hofmann, D. Rytz, S. Köber, M. Salvador, K. Meerholz, in: Conference on Lasers and Electro-Optics, 2009 and 2009 Quantum Electronics and Laser Science Conference, 2009, pp. 1253–1254.
LibreCat | DOI
 
[35]
2009 | Conference Paper | LibreCat-ID: 64517
Lasing of the III/V compound semiconductor Ga(NAsP) integrated lattice-matched to Si substrate
N.C. Gerhardt, B. Kunert, S. Liebich, M. Zimprich, S. Zinnkann, R. Fritz, K. Volz, W. Stolz, C. Lange, N.S. Köster, S.N. Chatterjee, W.W. Rühle, in: Group IV Photonics, 2009, pp. 199–201.
LibreCat | DOI
 
[34]
2009 | Journal Article | LibreCat-ID: 64511
Depth resolved holographic imaging with variable depth resolution using spectrally tunable diode laser
N. Koukourakis, M. Breede, N.C. Gerhardt, M. Hofmann, S. Köber, M. Salvador, K. Meerholz, Electronics Letters 45 (2009) 46–48.
LibreCat | DOI
 
[33]
2009 | Conference Paper | LibreCat-ID: 64523
Three-dimensional bone imaging: optical coherence tomography versus micro computer tomography
C. Kasseck, N.C. Gerhardt, T. Gambichler, M. Hofmann, M. Kratz, A. Torcasio, G.H. van Lenthe, K. Hoffmann, D.B. Jones, in: Optical Coherence Tomography and Coherence Techniques IV, 2009, p. 73721B.
LibreCat | DOI
 
[32]
2009 | Journal Article | LibreCat-ID: 64521
Single-shot holography for depth resolved three dimensional imaging
N. Koukourakis, C. Kasseck, N.C. Gerhardt, M. Hofmann, D. Rytz, Optics Express 17 (2009) 21015–21029.
LibreCat | DOI
 
[31]
2009 | Conference Paper | LibreCat-ID: 64518
Multispectral photoacoustic coded excitation using orthogonal unipolar golay codes
M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, M. Hofmann, G. Schmitz, in: Diagnostic Imaging, 2009, pp. 217–220.
LibreCat | DOI
 
[30]
2009 | Conference Paper | LibreCat-ID: 64516
Lasing in optically pumped Ga(NAsP)/(BGa)(AsP) heterstructures on Silicon
N.C. Gerhardt, N. Koukourakis, M. Hofmann, C. Lange, N.S. Köster, D.J. Franzbach, S.N. Chatterjee, W.W. Rühle, S. Zinnkann, S. Liebich, R. Nemeth, R. Fritz, K. Volz, W. Stolz, B. Kunert, in: Conference on Lasers and Electro-Optics, 2009 and 2009 Quantum Electronics and Laser Science Conference, 2009, pp. 1–2.
LibreCat | DOI
 
[29]
2009 | Conference Paper | LibreCat-ID: 64515
Laser operation of III/V compound material Ga(NAsP) grown lattice-matched on (001) Si substrate
N.C. Gerhardt, N. Koukourakis, M. Hofmann, B. Kunert, S. Liebich, S. Zinnkann, R. Nemeth, R. Fritz, K. Volz, W. Stolz, C. Lange, N.S. Köster, D.J. Franzbach, S.N. Chatterjee, W.W. Rühle, in: Device Research Conference, 2009, pp. 193–194.
LibreCat | DOI
 
[28]
2009 | Conference Paper | LibreCat-ID: 64513
Feasibility study of multispectral photoacoustic coded excitation using orthogonal unipolar Golay codes
M. Mienkina, G. Schmitz, C.-S. Friedrich, N.C. Gerhardt, M. Hofmann, A. Eder, in: 2009 IEEE Ultrasonics Symposium, 2009, pp. 108–111.
LibreCat | DOI
 
[27]
2009 | Journal Article | LibreCat-ID: 64512
Evaluation of Ferucarbotran (Resovist®) as a photoacoustic contrast agent
M. Mienkina, C.-S. Friedrich, K. Hensel, N.C. Gerhardt, M. Hofmann, G. Schmitz, Biomedical Engineering 54 (2009) 83–88.
LibreCat | DOI
 
[26]
2009 | Conference Paper | LibreCat-ID: 64522
Spin-con­trol­led op­to­elec­tro­nic de­vices
S. Hövel, N.C. Gerhardt, M. Hofmann, F.-Y. Lo, D. Reuter, A. Wieck, E.U. Schuster, W. Keune, in: Papers Presented at the 9th International Workshop on Nonlinear Optics and Excitation Kinetics in Semiconductors (NOEKS 9), 2009, pp. 436–439.
LibreCat | DOI
 
[25]
2009 | Conference Paper | LibreCat-ID: 64509
Compact semiconductor laser sources for photoacoustic imaging
C.-S. Friedrich, M. Mienkina, N.C. Gerhardt, G. Schmitz, M. Hofmann, M.-C. Wawreczko, in: Photons plus Ultrasound, 2009, pp. 1–7.
LibreCat | DOI
 
[24]
2009 | Conference Paper | LibreCat-ID: 64510
Comparison of coding techniques for photoacoustic coded excitation
M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, M.R. Hofmann, G. Schmitz, A. Eder, in: Proceedings, 2009, pp. 313–316.
LibreCat
 
[23]
2008 | Conference Paper | LibreCat-ID: 64524
Evaluation of simplex codes for photoacoustic coded excitation
C.-S. Friedrich, N.C. Gerhardt, M. Hofmann, G. Schmitz, M.P. Mienkina, A. Eder, in: 4th European Conference of the International Federation for Medical and Biological Engineering, 2008, pp. 444–447.
LibreCat | DOI
 
[22]
2008 | Conference Paper | LibreCat-ID: 64525
Simulation study of photoacoustic coded excitation using Golay codes
M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, M. Hofmann, G. Schmitz, A. Eder, in: IEEE Ultrasonics Symposium, 2008, 2008, pp. 1242–1245.
LibreCat | DOI
 
[21]
2007 | Conference Paper | LibreCat-ID: 64527
External-cavity diode laser utilizing a micromirror device for spectral tuning
M. Breede, C. Kasseck, C. Brenner, N.C. Gerhardt, M. Hofmann, R. Höfling, in: Optical Measurement Systems for Industrial Inspection V, 2007, pp. 1–11.
LibreCat | DOI
 
[20]
2007 | Journal Article | LibreCat-ID: 64528
Micromirror device controlled tunable diode laser
M. Breede, C. Kasseck, C. Brenner, N.C. Gerhardt, M. Hofmann, R. Höfling, Electronics Letters 43 (2007) 456–457.
LibreCat | DOI
 
[19]
2007 | Conference Paper | LibreCat-ID: 64529
Photoacoustic imaging of Fibrosarcoma using RGD-Cy 3 as a targeted contrast agent
M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, K. Hensel, C. Brenner, M. Hofmann, G. Schmitz, K. Waldeck, in: IEEE Ultrasonics Symposium, 2007, 2007, pp. 2409–2412.
LibreCat | DOI
 
[18]
2007 | Journal Article | LibreCat-ID: 64526
Evaluation eines kommerziellen Ultraschallgeräts für den Einsatz im photoakustischen Reflexionsmodus
M. Mienkina, N.C. Gerhardt, M. Breede, C. Brenner, M. Hofmann, G. Schmitz, K. Waldeck, Biomedical Engineering 52 (2007) G2-1.
LibreCat
 
[17]
2007 | Journal Article | LibreCat-ID: 64531
Spin-controlled LEDs and VCSELs
S. Hövel, N.C. Gerhardt, C. Brenner, M. Hofmann, F.-Y. Lo, D. Reuter, A. Wieck, E.U. Schuster, W. Keune, Physica Status Solidi 204 (2007) 500–507.
LibreCat | DOI
 
[16]
2007 | Conference Paper | LibreCat-ID: 64530
Spectroscopic fourier domain optical coherence tomography
C. Kasseck, N.C. Gerhardt, M. Hofmann, K. Lehmann, in: Optical Coherence Tomography and Coherence Techniques III, 2007, pp. 1–9.
LibreCat | DOI
 
[15]
2006 | Dissertation | LibreCat-ID: 64534
Optische Verstärkung und Spin-kontrollierte Emission von Halbleiterlasern
N.C. Gerhardt, F. für Elektrotechnik und Informationstechnik, Optische Verstärkung Und Spin-Kontrollierte Emission von Halbleiterlasern, 2006.
LibreCat
 
[14]
2006 | Journal Article | LibreCat-ID: 64533
Experimentelle Charakterisierung von Ferucarbotran als photoakustisches Kontrastmittel
M. Mienkina, K. Hensel, N.T. Le, N.C. Gerhardt, E. Bründermann, M. Havenith, M. Hofmann, G. Schmitz, I. Kopf, Biomedical Engineering 51 (2006) 1–2.
LibreCat
 
[13]
2006 | Conference Paper | LibreCat-ID: 64532
Experimental characterization of ferucarbotran (Resovist ®) as a photoacoustic nanoparticle contrast agent
M. Mienkina, K. Hensel, N.T. Le, N.C. Gerhardt, C. Hansen, M. Hofmann, G. Schmitz, in: Proceedings, 2006, pp. 393–396.
LibreCat | DOI
 
[12]
2005 | Conference Paper | LibreCat-ID: 64536
Spin-controlled LEDs and VCSELs
N.C. Gerhardt, S. Hövel, C. Brenner, M. Hofmann, D. Reuter, A. Wieck, J. Yang, in: Physics and Simulation of Optoelectronic Devices XIII, 2005, pp. 221–229.
LibreCat | DOI
 
[11]
2005 | Journal Article | LibreCat-ID: 64535
Electron spin injection into GaAs from ferromagnetic contacts in remanence
N.C. Gerhardt, S. Hövel, C. Brenner, M. Hofmann, F.-Y. Lo, D. Reuter, A. Wieck, K. Westerholt, E.U. Schuster, W. Keune, Applied Physics Letters 87 (2005) 1–3.
LibreCat | DOI
 
[10]
2003 | Conference Paper | LibreCat-ID: 64538
Gain and emission dynamics of dilute nitride quantum well lasers
M. Hofmann, N.C. Gerhardt, in: Frontiers in Optics 2003, 2003.
LibreCat | DOI
 
[9]
2003 | Conference Paper | LibreCat-ID: 64539
Optical gain of 1.3 μm (GaIn)(NAs)/GaAs lasers - a comparison between theory and experiment
N.C. Gerhardt, N. Hofmann, W. Stolz, W. Koch, J. Hader, J.V. Moloney, A.Y. Egorov, H. Riechert, in: Special Section on Semiconductor Optoelectronics, 2003.
LibreCat
 
[8]
2003 | Journal Article | LibreCat-ID: 64540
Optical spectroscopy of 1.3 μm (GaIn)(NAs)/GaAs lasers
N.C. Gerhardt, M. Hofmann, W.W. Rühle, IEE Proceedings 150 (2003) 45–48.
LibreCat | DOI
 
[7]
2003 | Conference Paper | LibreCat-ID: 64537
Experimentelle Methoden zur Bestimmung der optischen Verstärkung von 1.3µm (GaIn)(NAs)/GaAs Halbleiterlasern
N.C. Gerhardt, M.R. Hofmann, in: Frühjahrstagung Des Arbeitskreises Festkörperphysik Bei Der DPG, 2003.
LibreCat
 
[6]
2002 | Journal Article | LibreCat-ID: 64541
Emission dynamics and optical gain of 1.3 \mum (GaIn)(NAs)/GaAs Lasers
M. Hofmann, N.C. Gerhardt, A. Wagner, C. Ellmers, F. Höhnsdorf, J. Koch, W. Stolz, S.W. Koch, W.W. Rühle, J. Hader, J.V. Moloney, E.P. O‘Reilly, B. Borchert, A.Y. Egorov, H. Riechert, H.C. Schneider, W.W. Chow, IEEE Journal of Quantum Electronics / Institute of Electrical and Electronics Engineers 38 (2002) 213–221.
LibreCat | DOI
 
[5]
2002 | Conference Paper | LibreCat-ID: 64542
Influence of growth conditions on the optical gain of 1.3 /spl mu/m (GaIn)(NAs)/GaAs lasers
N.C. Gerhardt, M. Hofmann, K. Hantke, W. Stolz, S.W. Koch, J. Hader, J.V. Moloney, A.Y. Egorov, H. Riechert, in: Conference Digest, 2002, pp. 85–86.
LibreCat | DOI
 
[4]
2001 | Conference Paper | LibreCat-ID: 64543
Emission dynamics of (GaIn)(NAs)/GaAs lasers emitting at 1.3 μm
M. Hofmann, N.C. Gerhardt, A. Wagner, C. Ellmers, F. Höhnsdorf, J. Koch, S. Leu, W. Stolz, W.W. Rühle, in: Physics and Simulation of Optoelectronic Devices IX, 2001, pp. 256–266.
LibreCat | DOI
 
[3]
2001 | Conference Paper | LibreCat-ID: 64545
Optische Verstärkung von (GaIn)(NAs)/GaAs Halbleiterlasern
M.R. Hofmann, N.C. Gerhardt, A. Wagner, C. Ellmers, F. Höhnsdorf, J. Koch, S.W. Koch, W.W. Rühle, J. Hader, J.V. Moloney, W. Stolz, in: 65. Physikertagung & Frühjahrstagung Des Arbeitskreises Festkörperphysik Bei Der DPG, 2001.
LibreCat
 
[2]
2001 | Conference Paper | LibreCat-ID: 64546
Physics of 1.3µm (GaIn)(NAs)/GaAs semiconductor lasers
M. Hofmann, N.C. Gerhardt, A. Wagner, W. Stolz, S.W. Koch, W.W. Rühle, J. Hader, in: LEOS 2001, 2001, pp. 326–327.
LibreCat | DOI
 
[1]
2001 | Book Chapter | LibreCat-ID: 64547
Spintronics - Spin electronics and optoelectronics in semiconductors
D. Hägele, N.C. Gerhardt, M. Hofmann, M. Oestreich, J. Hübner, M. Bender, W.W. Rühle, H. Kalt, T. Hartmann, P.J. Klar, W. Heimbrodt, W. Stolz, in: Advances in Solid State Physics 41, 2001, pp. 173–186.
LibreCat | DOI
 
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[184]
2025 | Journal Article | LibreCat-ID: 61932
VCSELs: Influence of Design on Performance and Data Transmission over Multi-Mode and Single-Mode Fibers
N.N. Ledentsov, N. Ledentsov, V.A. Shchukin, A.N. Ledentsov, O.Yu. Makarov, I.E. Titkov, M. Lindemann, T. de Adelsburg Ettmayer, N.C. Gerhardt, M.R. Hofmann, X. Chen, J.E. Hurley, H. Dong, M.-J. Li, Photonics 12 (2025).
LibreCat | DOI
 
[183]
2025 | Journal Article | LibreCat-ID: 61931
Multimode vertical-cavity surface-emitting lasers under spin injection
U. Diiankova, M. Drong, T. Pusch, R. Michalzik, M. Lindemann, N.C. Gerhardt, M.R. Hofmann, APL Photonics 10 (2025).
LibreCat | DOI
 
[182]
2025 | Journal Article | LibreCat-ID: 64551
Laterally coupled vertical-cavity surface-emitting lasers with tunable resonance width and frequency
M. Lindemann, M. D’Alessandro, N. Ledentsov, O.Y. Makarov, N.N. Ledentsov, A. Tibaldi, N.C. Gerhardt, M.R. Hofmann, Journal of Applied Physics 138 (2025).
LibreCat | DOI
 
[181]
2025 | Conference Paper | LibreCat-ID: 64293
Quantitative holography for the characterisation of semiconductor amplifieres and lasers
N.C. Gerhardt, M.R. Hofmann, L. Zens, J. Möller, V. Besaga, in: Practical Holography XXXIX: Displays, Materials, and Applications, 2025.
LibreCat | DOI
 
[180]
2024 | Journal Article | LibreCat-ID: 64550
Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides
L. Zens, V. Besaga, J. Möller, N.C. Gerhardt, M. Hofmann, Optics Express (2024).
LibreCat | DOI
 
[179]
2024 | Journal Article | LibreCat-ID: 64585
Controlling the helicity of light by electrical magnetization switching
M. Lindemann, N.C. Gerhardt, P.A. Dainone, P. Renucci, A. Bouché, M. Morassi, X. Devaux, J.-M. George, H. Jaffrès, A. Lemaitre, B. Xu, M. Stoffel, T. Chen, L. Lombez, D. Lagarde, G. Cong, T. Ma, P. Pigeat, M. Vergnat, H. Rinnert, X. Marie, X. Han, S. Mangin, J.-C. Rojas-Sánchez, J.-P. Wang, M.C. Beard, I. Žutić, N. Figueiredo Prestes, Y. Lu, Nature 627 (2024) 783–788.
LibreCat | DOI
 
[178]
2024 | Journal Article | LibreCat-ID: 64549
Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides
L. Zens, V. Besaga, J. Möller, N.C. Gerhardt, M. Hofmann, Optics Express (2024).
LibreCat | DOI
 
[177]
2024 | Conference Paper | LibreCat-ID: 64296
Study of Electrically Excited Photon-Photon Resonances in Self-Injection-Locked Coupled-Cavity VCSELs
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, N.N. Ledentsov, V.A. Shchukin, O.Y. Makarov, V. Zerova, M. D’alessandro, A. Tibaldi, J.P. Turkiewicz, in: 2024 IEEE 29th International Semiconductor Laser Conference (ISLC), 2024.
LibreCat | DOI
 
[176]
2024 | Journal Article | LibreCat-ID: 64295
Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides
L. Zens, V. Besaga, J. Möller, N.C. Gerhardt, M.R. Hofmann, Optics Express 33 (2024) 34–49.
LibreCat | DOI
 
[175]
2024 | Journal Article | LibreCat-ID: 59663
Controlling the helicity of light by electrical magnetization switching
P.A. Dainone, N.F. Prestes, P. Renucci, A. Bouché, M. Morassi, X. Devaux, M. Lindemann, J.-M. George, H. Jaffrès, A. Lemaitre, B. Xu, M. Stoffel, T. Chen, L. Lombez, D. Lagarde, G. Cong, T. Ma, P. Pigeat, M. Vergnat, H. Rinnert, X. Marie, X. Han, S. Mangin, J.-C. Rojas-Sánchez, J.-P. Wang, M.C. Beard, N.C. Gerhardt, I. Žutić, Y. Lu, Nature 627 (2024) 783–788.
LibreCat | DOI
 
[174]
2024 | Conference Paper | LibreCat-ID: 64298
Analysis of laterally-coupled-cavity VCSELs for ultra-high-frequency photon-photon resonance modulation
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, N. Ledentsov, N.N. Ledentsov, V.A. Shchukin, Ł. Chorchos, O.Y. Makarov, J.R. Kropp, I.E. Titkov, V.P. Kalosha, V. Zerova, M. D’Alessandro, V. Torrelli, A. Tibaldi, P. Debernardi, in: Vertical-Cavity Surface-Emitting Lasers XXVIII, 2024.
LibreCat | DOI
 
[173]
2023 | Journal Article | LibreCat-ID: 64302
Polarization dynamics in spin‐VCSELs with integrated surface grating for high birefringence splitting
M. Lindemann, N. Jung, N.C. Gerhardt, M.R. Hofmann, N. Manrique‐Nieto, T. Pusch, R. Michalzik, Electronics Letters 59 (2023).
LibreCat | DOI
 
[172]
2022 | Journal Article | LibreCat-ID: 59668
Spin‐Lasing in Bimodal Quantum Dot Micropillar Cavities
N. Heermeier, T. Heuser, J. Große, N. Jung, A. Kaganskiy, M. Lindemann, N.C. Gerhardt, M.R. Hofmann, S. Reitzenstein, Laser & Photonics Reviews 16 (2022).
LibreCat | DOI
 
[171]
2022 | Conference Paper | LibreCat-ID: 64306
Spin lasing in high-beta bimodal quantum dot micropillar cavities
N. Heermeier, N. Jung, M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Heuser, J. Große, A. Kaganskiy, S. Reitzenstein, in: Spintronics XV, 2022.
LibreCat | DOI
 
[170]
2022 | Journal Article | LibreCat-ID: 64307
Investigation of laser-induced periodic surface structures using synthetic optical holography
E.L. Gurevich, M.R. Hofmann, N.C. Gerhardt, K. Neutsch, Nanomaterials 13 (2022).
LibreCat | DOI
 
[169]
2020 | Journal Article | LibreCat-ID: 59686
Time-resolved photoluminescence characterization of InGaAs/GaAs nano-ridges monolithically grown on 300 mm Si substrates
Y. Shi, L.C. Kreuzer, N.C. Gerhardt, M. Pantouvaki, J. Van Campenhout, M. Baryshnikova, R. Langer, D. Van Thourhout, B. Kunert, Journal of Applied Physics 127 (2020).
LibreCat | DOI
 
[168]
2020 | Journal Article | LibreCat-ID: 59685
Spin-lasers: spintronics beyond magnetoresistance
I. Žutić, G. Xu, M. Lindemann, P.E. Faria Junior, J. Lee, V. Labinac, K. Stojšić, G.M. Sipahi, M.R. Hofmann, N.C. Gerhardt, Solid State Communications 316–317 (2020).
LibreCat | DOI
 
[167]
2020 | Journal Article | LibreCat-ID: 59684
Confocal laser scanning holographic microscopy of buried structures
L. Schnitzler, K. Neutsch, F. Schellenberg, M.R. Hofmann, N.C. Gerhardt, Applied Optics 60 (2020).
LibreCat | DOI
 
[166]
2019 | Conference Paper | LibreCat-ID: 64361
Three-dimensional particle localization with common-path digital holographic microscopy
K. Neutsch, M.R. Hofmann, N.C. Gerhardt, L. Schnitzler, M.J. Tranelis, in: Practical Holography XXXIII: Displays, Materials, and Applications, 2019.
LibreCat | DOI
 
[165]
2019 | Book Chapter | LibreCat-ID: 64360
Semiconductor spin-lasers
N.C. Gerhardt, I. Žutić, J. Lee, C. Gøthgen, J. Farla, Paulo E., G. Xu, G.M. Sipahi, in: Nanoscale Spintronics and Applications, 2019, pp. 499–540.
LibreCat
 
[164]
2019 | Journal Article | LibreCat-ID: 59687
Ultrafast spin-lasers
M. Lindemann, G. Xu, T. Pusch, R. Michalzik, M.R. Hofmann, I. Žutić, N.C. Gerhardt, Nature 568 (2019) 212–215.
LibreCat | DOI
 
[163]
2018 | Conference Paper | LibreCat-ID: 64371
Brain tissue analysis using texture features based on optical coherence tomography images
M.R. Hofmann, M. Lenz, R. Krug, N.C. Gerhardt, K. Schmieder, C. Dillmann, H. Welp, in: Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXII, 2018.
LibreCat | DOI
 
[162]
2018 | Conference Paper | LibreCat-ID: 64372
Classification of brain tissue with optical coherence tomography by employing texture analysis
M. Lenz, R. Krug, N.C. Gerhardt, K. Schmieder, M.R. Hofmann, C. Dillmann, H. Welp, in: Optics, Photonics, and Digital Technologies for Imaging Applications V, 2018.
LibreCat | DOI
 
[161]
2018 | Conference Paper | LibreCat-ID: 64376
Digital holography for the investigation of buried structures with a common-path reflection microscope
M.R. Hofmann, N.C. Gerhardt, M. Finkeldey, L. Göring, in: Practical Holography XXXII: Displays, Materials, and Applications, 2018.
LibreCat | DOI
 
[160]
2018 | Conference Paper | LibreCat-ID: 64379
Thermally-induced birefringence in VCSELs - approaching the limits
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, S. Scherübl, in: Semiconductor Lasers and Laser Dynamics VIII, 2018.
LibreCat | DOI
 
[159]
2018 | Conference Paper | LibreCat-ID: 64375
Demonstrating ultrafast polarization dynamics in spin-VCSELs
M. Lindemann, N.C. Gerhardt, M. Hofmann, T. Pusch, R. Michalzik, in: Vertical-Cavity Surface-Emitting Lasers XXII, 2018.
LibreCat | DOI
 
[158]
2018 | Conference Paper | LibreCat-ID: 64378
Spin lasers for optical data communication
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, R. Michalzik, T. Pusch, in: Semiconductor Lasers and Laser Dynamics VIII, 2018.
LibreCat | DOI
 
[157]
2018 | Conference Paper | LibreCat-ID: 64377
Electrical birefringence tuning of VCSELs
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, R. Michalzik, T. Pusch, in: Vertical-Cavity Surface-Emitting Lasers XXII, 2018.
LibreCat | DOI
 
[156]
2018 | Conference Paper | LibreCat-ID: 64374
Common-path digital holographic microscopy for 3D nanoparticle localization
N.C. Gerhardt, K. Neutsch, L. Göring, in: Nanoimaging and Nanospectroscopy VI, 2018.
LibreCat | DOI
 
[155]
2018 | Conference Paper | LibreCat-ID: 64380
Toward ultrafast spin lasers?
N.C. Gerhardt, G. Xu, I. Žutić, in: APS March Meeting 2018, 2018.
LibreCat
 
[154]
2018 | Journal Article | LibreCat-ID: 64370
Automated differentiation between meningioma and healthy brain tissue based on optical coherence tomography ex vivo images using texture features
M. Lenz, R. Krug, N.C. Gerhardt, K. Schmieder, C. Dillmann, R. Stroop, H. Welp, Journal of Biomedical Optics 23 (2018) 071205.
LibreCat | DOI
 
[153]
2018 | Conference Paper | LibreCat-ID: 64369
A direct-view customer-oriented digital holographic camera
V. Besaga, N.C. Gerhardt, M.R. Hofmann, P.P. Maksimyak, in: Thirteenth International Conference on Correlation Optics, 2018.
LibreCat | DOI
 
[152]
2017 | Conference Paper | LibreCat-ID: 64402
Spectroscopic optical coherence tomography for ex vivo brain tumor analysis
M. Lenz, R. Krug, A. Gerling, K. Schmieder, M. Hofmann, N.C. Gerhardt, C. Dillmann, H. Welp, in: Advanced Biomedical and Clinical Diagnostic and Surgical Guidance Systems XV, 2017.
LibreCat | DOI
 
[151]
2017 | Conference Paper | LibreCat-ID: 64399
Multimodal backside imaging of a microcontroller using confocal laser scanning and optical-beam-induced current imaging
M. Finkeldey, L. Göring, F. Schellenberg, C. Brenner, N.C. Gerhardt, M.R. Hofmann, in: Photonic Instrumentation Engineering IV, 2017.
LibreCat | DOI
 
[150]
2017 | Journal Article | LibreCat-ID: 64401
Optical metrology for the investigation of buried technical structures
M. Finkeldey, F. Schellenberg, C. Brenner, M.R. Hofmann, N.C. Gerhardt, L. Göring, Technisches Messen 85 (2017) 104–110.
LibreCat | DOI
 
[149]
2017 | Conference Paper | LibreCat-ID: 64398
Linking transducer transfer function with multi-pulse excitation photoacoustic response
M.N. Cherkashin, C. Brenner, W.D. Putro, B. Döpke, N.C. Gerhardt, M.R. Hofmann, in: Medical Imaging 2017: Ultrasonic Imaging and Tomography, 2017.
LibreCat | DOI
 
[148]
2017 | Conference Paper | LibreCat-ID: 64400
Nondestructive evaluation of protective coatings for the conservation of industrial monuments
M. Lenz, N.C. Gerhardt, M. Prange, M.R. Hofmann, C. Mazzon, C. Dillmann, H. Welp, in: Optics for Arts, Architecture, and Archaeology VI, 2017.
LibreCat | DOI
 
[147]
2017 | Conference Paper | LibreCat-ID: 64397
Lensless digital holographic microscope using in-line configuration and laser diode illumination
L. Göring, M. Finkeldey, A. Ad­in­da-Oug­ba, N.C. Gerhardt, M. Hofmann, in: Practical Holography XXXI: Materials and Applications, 2017.
LibreCat | DOI
 
[146]
2017 | Journal Article | LibreCat-ID: 64386
Spectral domain optical coherence tomography for non-destructive testing of protection coatings on metal substrates
M. Lenz, N.C. Gerhardt, M. Hofmann, C. Mazzon, C. Dillmann, H. Welp, M. Prange, Applied Sciences 7 (2017).
LibreCat | DOI
 
[145]
2017 | Journal Article | LibreCat-ID: 64385
Monolithic vertical-cavity surface-emitting laser with thermally tunable birefringence
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, E. La Tona, Applied Physics Letters 110 (2017).
LibreCat | DOI
 
[144]
2017 | Conference Paper | LibreCat-ID: 64393
Dynamics of the photoacoustic response of single-element PZT transducers to pulse burst excitation
M.N. Cherkashin, C. Brenner, W.D. Putro, B. Döpke, N.C. Gerhardt, M.R. Hofmann, in: Photons Plus Ultrasound: Imaging and Sensing 2017, 2017.
LibreCat | DOI
 
[143]
2017 | Journal Article | LibreCat-ID: 64384
Depth-filtering in common-path digital holographic microscopy
M. Finkeldey, L. Göring, C. Brenner, M. Hofmann, N.C. Gerhardt, Optics Express 25 (2017) 19398–19407.
LibreCat | DOI
 
[142]
2017 | Conference Paper | LibreCat-ID: 64388
Backside imaging of a microcontroller with common-path digital holography
M. Finkeldey, F. Schellenberg, N.C. Gerhardt, M. Hofmann, L. Göring, in: Practical Holography XXXI: Materials and Applications, 2017.
LibreCat | DOI
 
[141]
2017 | Conference Paper | LibreCat-ID: 64395
Investigations on polarization oscillation amplitudes in spin-VCSELs
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: Vertical-Cavity Surface-Emitting Lasers XXI, 2017.
LibreCat | DOI
 
[140]
2017 | Conference Paper | LibreCat-ID: 64391
Common-path holographic objective for conventional photographic camera
V. Besaga, N.C. Gerhardt, M.R. Hofmann, P.P. Maksimyak, in: Novel Optical Systems Design and Optimization XX, 2017.
LibreCat | DOI
 
[139]
2017 | Conference Paper | LibreCat-ID: 64394
High-frequency polarization dynamics in spin-lasers - pushing the limits
M. Lindemann, M.R. Hofmann, N.C. Gerhardt, T. Pusch, R. Michalzik, in: Spintronics X, 2017.
LibreCat | DOI
 
[138]
2017 | Journal Article | LibreCat-ID: 64403
Thermally induced birefringence tuning of 37 GHz in VCSELs
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, E. La Tona, R. Michalzik, 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC 2017) 1 (2017) 108.
LibreCat | DOI
 
[137]
2017 | Journal Article | LibreCat-ID: 64392
Digital holographic microscopy of buried specimen using a common-path reflective setup
M. Finkeldey, C. Brenner, N.C. Gerhardt, M.R. Hofmann, L. Göring, DGaO-Proceedings 118 (2017).
LibreCat
 
[136]
2016 | Journal Article | LibreCat-ID: 59690
Frequency tuning of polarization oscillations: Toward high-speed spin-lasers
M. Lindemann, T. Pusch, R. Michalzik, N.C. Gerhardt, M.R. Hofmann, Applied Physics Letters 108 (2016).
LibreCat | DOI
 
[135]
2016 | Preprint | LibreCat-ID: 64425
Large laser spots and fault sensitivity analysis
F. Schellenberg, M. Finkeldey, N.C. Gerhardt, M.R. Hofmann, A. Moradi, C. Paar, (2016).
LibreCat
 
[134]
2016 | Journal Article | LibreCat-ID: 64426
Local bi­na­ry pat­terns for dif­fe­ren­tia­ti­on of brain tis­sue types in­op­ti­cal co­he­rence to­mo­gra­phy ima­ges
M. Lenz, R. Krug, N.C. Gerhardt, K. Schmieder, M. Hofmann, C. Dillmann, H. Welp, Biomedical Engineering 61 (2016).
LibreCat
 
[133]
2016 | Conference Paper | LibreCat-ID: 64424
Large laser spots and fault sensitivity analysis
F. Schellenberg, M. Finkeldey, N.C. Gerhardt, M.R. Hofmann, A. Moradi, C. Paar, in: 2016 IEEE International Symposium on Hardware Oriented Security and Trust (HOST 2016), 2016, pp. 203–208.
LibreCat | DOI
 
[132]
2016 | Conference Paper | LibreCat-ID: 64420
Common-path depth-filtered digital holography for high resolution imaging of buried semiconductor structures
M. Finkeldey, F. Schellenberg, N.C. Gerhardt, C. Paar, M. Hofmann, in: Practical Holography XXX: Materials and Applications, 2016.
LibreCat | DOI
 
[131]
2016 | Conference Paper | LibreCat-ID: 64423
Influence of birefringence splitting on ultrafast polarization oscillations in VCSELs
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: Vertical-Cavity Surface-Emitting Lasers XX, 2016.
LibreCat | DOI
 
[130]
2016 | Conference Paper | LibreCat-ID: 64427
Microscopic description of a spin laser
N.C. Gerhardt, Jr. Faria, Paulo E., G. Xu, J. Lee, G.M. Sipahi, I. Žutić, in: APS March Meeting 2016, 2016.
LibreCat
 
[129]
2016 | Conference Paper | LibreCat-ID: 64422
Frequency tuning of polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers
M. Lindemann, M.R. Hofmann, N.C. Gerhardt, T. Pusch, R. Michalzik, in: Semiconductor Lasers and Laser Dynamics VII, 2016.
LibreCat | DOI
 
[128]
2016 | Conference Paper | LibreCat-ID: 64419
Birefringent vertical cavity surface-emitting lasers - toward high-speed spin-lasers
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: Semiconductor Lasers and Laser Dynamics VII, 2016.
LibreCat | DOI
 
[127]
2016 | Conference Paper | LibreCat-ID: 64415
Dynamics of double-pulse photoacoustic excitation
C. Brenner, L. Göring, B. Döpke, M.N. Cherkashin, N.C. Gerhardt, M.R. Hofmann, in: Photons Plus Ultrasound: Imaging and Sensing 2016, 2016.
LibreCat | DOI
 
[126]
2016 | Journal Article | LibreCat-ID: 64421
Common-path digital holography microscopy of buried semiconductor specimen
L. Göring, M. Finkeldey, N.C. Gerhardt, M.R. Hofmann, Adaptive Optics: Analysis, Methods & Systems (2016).
LibreCat | DOI
 
[125]
2016 | Conference Paper | LibreCat-ID: 64418
Birefringence tuning of VCSELs
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, M. Bou Sanayeh, R. Mich­al­zik, T. Pusch, in: Semiconductor Lasers and Laser Dynamics VII, 2016.
LibreCat | DOI
 
[124]
2016 | Conference Paper | LibreCat-ID: 64411
Common-path digital holography microscopy of buried semiconductor specimen
N.C. Gerhardt, M.R. Hofmann, M. Finkeldey, L. Göring, in: 2016.
LibreCat | DOI
 
[123]
2016 | Conference Paper | LibreCat-ID: 64413
Common-path digital holography microscopy of buried semiconductor specimen
N.C. Gerhardt, M.R. Hofmann, M. Finkeldey, L. Goring, in: 2016.
LibreCat | DOI
 
[122]
2016 | Conference Paper | LibreCat-ID: 64417
Common-path digital holography microscopy of buried semiconductor specimen
N.C. Gerhardt, M.R. Hofmann, M. Finkeldey, L. Goring, in: 2016.
LibreCat
 
[121]
2016 | Conference Paper | LibreCat-ID: 64416
On the complexity reduction of laser fault injection campaigns using OBIC measurements
F. Schellenberg, M. Finkeldey, B. Richter, N.C. Gerhardt, M. Hofmann, C. Paar, M. Schapers, in: 2015 Workshop on Fault Diagnosis and Tolerance in Cryptography - FDTC 2015, 2016, pp. 14–27.
LibreCat | DOI
 
[120]
2016 | Conference Paper | LibreCat-ID: 64407
High-frequency operation of spin vertical-cavity surface-emitting lasers - towards 100 GHz
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: Spintronics IX, 2016.
LibreCat | DOI
 
[119]
2016 | Journal Article | LibreCat-ID: 64406
Frequency tuning of polarization oscillations in spin-lasers
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, Spintronics IX (2016).
LibreCat | DOI
 
[118]
2016 | Conference Paper | LibreCat-ID: 64408
Common-path digital holography microscopy of buried semiconductor specimen
N.C. Gerhardt, M.R. Hofmann, M. Finkeldey, L. Göring, in: 2016.
LibreCat | DOI
 
[117]
2016 | Conference Paper | LibreCat-ID: 64409
Common-path digital holography microscopy of buried semiconductor specimen
N.C. Gerhardt, M.R. Hofmann, M. Finkeldey, L. Göring, in: 2016.
LibreCat | DOI
 
[116]
2016 | Conference Paper | LibreCat-ID: 64410
Common-path digital holography microscopy of buried semiconductor specimen
N.C. Gerhardt, M.R. Hofmann, M. Finkeldey, L. Go, in: 2016.
LibreCat | DOI
 
[115]
2016 | Conference Paper | LibreCat-ID: 64412
Common-path digital holography microscopy of buried semiconductor specimen
N.C. Gerhardt, M.R. Hofmann, M. Finkeldey, L. Göring, in: 2016.
LibreCat
 
[114]
2015 | Journal Article | LibreCat-ID: 59691
Toward high-frequency operation of spin lasers
P.E. Faria Junior, G. Xu, J. Lee, N.C. Gerhardt, G.M. Sipahi, I. Žutić, Physical Review B 92 (2015).
LibreCat | DOI
 
[113]
2015 | Journal Article | LibreCat-ID: 59693
Toward high-frequency operation of spin lasers
P.E. Faria Junior, G. Xu, J. Lee, N.C. Gerhardt, G.M. Sipahi, I. Žutić, Physical Review B 92 (2015).
LibreCat | DOI
 
[112]
2015 | Conference Paper | LibreCat-ID: 64444
Tu­ning the fre­quen­cy of po­la­riza­t­i­on oscil­la­ti­ons in spin VC­SELs by me­cha­ni­cal strain in­duc­tion in GHz-ran­ge
M. Lindemann, N.C. Gerhardt, M. Hofmann, T. Pusch, R. Michalzik, in: The European Conference on Lasers and Electro-Optics 2015, 2015.
LibreCat
 
[111]
2015 | Conference Paper | LibreCat-ID: 64441
Increasing the birefringence of VCSELs beyond 250 GHz
M. Lindemann, N.C. Gerhardt, M. Hofmann, T. Pusch, R. Michalzik, in: The European Conference on Lasers and Electro-Optics 2015, 2015.
LibreCat
 
[110]
2015 | Preprint | LibreCat-ID: 64442
On the complexity reduction of laser fault injection campaigns using OBIC measurements
F. Schellenberg, M. Finkeldey, B. Richter, N.C. Gerhardt, M.R. Hofmann, C. Paar, M. Schäpers, (2015).
LibreCat
 
[109]
2015 | Journal Article | LibreCat-ID: 64430
Simple concept for a wide-field lensless digital holographic microscope using a laser diode
A. Ad­in­da-Oug­ba, N. Koukourakis, N.C. Gerhardt, M. Hofmann, Current Directions in Biomedical Engineering 1 (2015) 261–264.
LibreCat | DOI
 
[108]
2015 | Conference Paper | LibreCat-ID: 64432
Laser-diode-based photoacoustic setup to analyze Grüneisen relaxation-effect induced signal enhancement
M.N. Cherkashin, C. Brenner, L. Schnitzler, B. Döpke, N.C. Gerhardt, M. Hofmann, in: Opto-Acoustic Methods and Applications in Biophotonics II, 2015.
LibreCat | DOI
 
[107]
2015 | Conference Paper | LibreCat-ID: 64436
Ultrafast polarization dynamics with controlled polarization oscillations in vertical-cavity surface-emitting lasers
M. Lindemann, H. Höpfner, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: Vertical-Cavity Surface-Emitting Lasers XIX, 2015, pp. 1–7.
LibreCat | DOI
 
[106]
2015 | Conference Paper | LibreCat-ID: 64443
Towards high frequency operation of polarization oscillations in spin vertical-cavity surface-emitting lasers
M. Lindemann, H. Höpfner, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: Spintronics VIII, 2015.
LibreCat | DOI
 
[105]
2015 | Journal Article | LibreCat-ID: 64435
Controlling the frequency of ultra-fast polarization oscillations in Spin-VCSELs
M. Lindemann, H. Höpfner, N.C. Gerhardt, M. Hofmann, T. Pusch, R. Michalzik, 79. Jahrestagung Der DPG Und DPG-Frühjahrstagung (2015).
LibreCat
 
[104]
2015 | Conference Paper | LibreCat-ID: 64440
Tuning the frequency of polarization oscillations in spin-VCSELs by mechanical strain induction
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: 2015.
LibreCat
 
[103]
2015 | Conference Paper | LibreCat-ID: 64437
Increasing the birefringence of VCSELs beyond 250 GHz
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: 2015.
LibreCat
 
[102]
2015 | Conference Paper | LibreCat-ID: 64429
Compact low-cost lensless digital holographic microscope for topographic measurements of microstructures in reflection geometry
A. Ad­in­da-Oug­ba, N. Koukourakis, F. Mitschker, N.C. Gerhardt, M. Hofmann, B. Kabir, in: Optical Systems Design 2015, 2015, pp. 1–8.
LibreCat | DOI
 
[101]
2015 | Conference Paper | LibreCat-ID: 64433
Quantitative phase imaging by wide field lensless digital holographic microscope
A. Ad­in­da-Oug­ba, N. Koukourakis, A. Essaidi, N.C. Gerhardt, M. Hofmann, in: Optical Methods for Inspection, Characterization, and Imaging of Biomaterials II, 2015, p. 952903.
LibreCat | DOI
 
[100]
2015 | Journal Article | LibreCat-ID: 64428
Vertical-cavity surface-emitting lasers with birefringence splitting above 250 GHz
M. Lindemann, N.C. Gerhardt, M. Hofmann, T. Pusch, R. Michalzik, Electronics Letters 51 (2015) 1600–1601.
LibreCat | DOI
 
[99]
2015 | Conference Paper | LibreCat-ID: 64431
Controlled switching and frequency tuning of polarization oscillations in vertical-cavity surface-emitting lasers
M. Lindemann, H. Höpfner, N.C. Gerhardt, M. Hofmann, T. Pusch, R. Michalzik, in: Spintronics VIII, 2015, pp. 1–5.
LibreCat | DOI
 
[98]
2015 | Conference Paper | LibreCat-ID: 64439
Tuning the frequency of polarization oscillations in Spin-VCSELs by mechanical strain induction
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: 2015.
LibreCat
 
[97]
2015 | Conference Paper | LibreCat-ID: 64438
Increasing the birefringence of VCSELs beyond 250 GHz
M. Lindemann, N.C. Gerhardt, M.R. Hofmann, T. Pusch, R. Michalzik, in: 2015.
LibreCat
 
[96]
2014 | Conference Paper | LibreCat-ID: 64453
Performance comparison of different metrics for spectroscopic optical coherence tomography
V. Jaedicke, S. Agcaer, N.C. Gerhardt, M. Hofmann, F.E. Robles, M. Steinert, D. Jones, S. Goebel, H. Welp, in: Biomedical Applications of Light Scattering VIII, 2014, pp. 1–10.
LibreCat | DOI
 
[95]
2014 | Conference Paper | LibreCat-ID: 64451
Effects of axial scanning in confocal microscopy employing adaptive lenses (CAL)
N. Koukourakis, M. Finkeldey, N.C. Gerhardt, M. Hofmann, M. Stürmer, U. Wallrabe, J. Czarske, A. Fischer, in: Optical Micro- and Nanometrology V, 2014.
LibreCat | DOI
 
[94]
2014 | Journal Article | LibreCat-ID: 64448
Axial scanning in confocal microscopy employing adaptive lenses (CAL)
N. Koukourakis, M. Finkeldey, N.C. Gerhardt, M.R. Hofmann, A. Fischer, M. Stürmer, C. Leithold, U. Wallrabe, J.W. Czarske, Optics Express 22 (2014) 6025–6039.
LibreCat | DOI
 
[93]
2014 | Journal Article | LibreCat-ID: 64450
Controlled switching of ultrafast circular polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers
H. Höpfner, M. Lindemann, N.C. Gerhardt, M. Hofmann, Applied Physics Letters 104 (2014) 1–5.
LibreCat | DOI
 
[92]
2014 | Journal Article | LibreCat-ID: 64452
Multiwavelength phase unwrapping and aberration correction using depth filtered digital holography
N. Koukourakis, N.C. Gerhardt, M.R. Hofmann, V. Jädicke, S. Göbel, H. Welp, Optics Letters 39 (2014) 4160–4163.
LibreCat | DOI
 
[91]
2014 | Conference Paper | LibreCat-ID: 64449
Coherent switching of polarization oscillations in vertical-cavity surface-emitting lasers
H. Höpfner, M. Lindemann, N.C. Gerhardt, M. Hofmann, in: Vertical-Cavity Surface-Emitting Lasers XVIII, 2014, pp. 9001–15.
LibreCat | DOI
 
[90]
2014 | Conference Paper | LibreCat-ID: 64447
Spin-controlled ultrafast vertical-cavity surface-emitting lasers
H. Höpfner, M. Lindemann, N.C. Gerhardt, M.R. Hofmann, in: Semiconductor Lasers and Laser Dynamics VI, 2014, pp. 1–6.
LibreCat | DOI
 
[89]
2014 | Conference Paper | LibreCat-ID: 64445
Polarization dynamics in spin-polarized vertical-cavity surface-emitting lasers
N.C. Gerhardt, H. Höpfner, M. Lindemann, M.R. Hofmann, in: Spintronics VII, 2014, pp. 1–10.
LibreCat | DOI
 
[88]
2014 | Journal Article | LibreCat-ID: 64446
Employing electrically tunable lenses in confocal microscopy for axial scanning
N. Koukourakis, M. Finkeldey, N.C. Gerhardt, M. Hofmann, M. Stürmer, C. Leithold, U. Wallrabe, J.W. Czarske, International C for Optics. Congress (2014).
LibreCat
 
[87]
2013 | Journal Article | LibreCat-ID: 64466
Spin relaxation in spin light-emitting diodes - effects of magnetic field and temperature
H. Höpfner, A. Ludwig, A. Ludwig, D. Reuter, A. Wieck, N.C. Gerhardt, M. Hofmann, C. Fritsche, F. Stromberg, H. Wende, W. Keune, Ultrafast Phenomena and Nanophotonics XVII (2013) 86230A–1.
LibreCat | DOI
 
[86]
2013 | Conference Paper | LibreCat-ID: 64460
Optical gain and lasing in GaNAsP/BGa(As)P heterostructures grown on (001) silicon substrate
M. Finkeldey, N. Koukourakis, N.C. Gerhardt, M.R. Hofmann, M. Zimprich, K. Volz, W. Stolz, in: DPG-Frühjahrstagung (DPG Spring Meeting) of the Condensed Matter Section with Its Divisions Biological Physics, Chemical and Polymer Physics, Crystallography, Dielectric Solids, Dynamics and Statistical Physics, Low Temperature Physics, Magnetism, Metal and Material Physics, Physics of Socio-Economic Systems, Semiconductor Physics, Surface Science, Thin Films, Vacuum Science and Technology Together with the Divions Microprobes, and Radiation and Medical Physics as Well as the Working Groups Industry and Business, and “Young DPG,” 2013.
LibreCat
 
[85]
2013 | Conference Paper | LibreCat-ID: 64464
Spin injection and spin relaxation: magnetic field effects
H. Höpfner, A. Ludwig, D. Reuter, A. Wieck, N.C. Gerhardt, M.R. Hofmann, C. Fritsche, F. Stromberg, H. Wende, W. Keune, in: DPG-Frühjahrstagung (DPG Spring Meeting) of the Condensed Matter Section with Its Divisions Biological Physics, Chemical and Polymer Physics, Crystallography, Dielectric Solids, Dynamics and Statistical Physics, Low Temperature Physics, Magnetism, Metal and Material Physics, Physics of Socio-Economic Systems, Semiconductor Physics, Surface Science, Thin Films, Vacuum Science and Technology Together with the Divions Microprobes, and Radiation and Medical Physics as Well as the Working Groups Industry and Business, and “Young DPG,” 2013.
LibreCat
 
[84]
2013 | Conference Paper | LibreCat-ID: 64456
Spectral analysis and spectroscopic metrics in Spectroscopic Optical Coherence Tomography
N.C. Gerhardt, M.R. Hofmann, V. Jaedicke, S. Aǧcaer, S. Goebel, H. Welp, in: 2013.
LibreCat | DOI
 
[83]
2013 | Conference Paper | LibreCat-ID: 64459
Non-exponential photoluminescence transients in GaNAsP lattice matched to (001) silicon substrate
N.C. Gerhardt, N. Koukourakis, M. Finkeldey, M. Hofmann, B. Kunert, M. Zimprich, K. Volz, W. Stolz, K. Jandieri, F. Gebhard, S. Baranovskii, in: DPG-Frühjahrstagung (DPG Spring Meeting) of the Condensed Matter Section with Its Divisions Biological Physics, Chemical and Polymer Physics, Crystallography, Dielectric Solids, Dynamics and Statistical Physics, Low Temperature Physics, Magnetism, Metal and Material Physics, Physics of Socio-Economic Systems, Semiconductor Physics, Surface Science, Thin Films, Vacuum Science and Technology Together with the Divions Microprobes, and Radiation and Medical Physics as Well as the Working Groups Industry and Business, and “Young DPG,” 2013.
LibreCat
 
[82]
2013 | Journal Article | LibreCat-ID: 64467
Spin relaxation length in quantum dot spin LEDs
H. Höpfner, A. Ludwig, A. Ludwig, D. Reuter, A. Wieck, N.C. Gerhardt, M. Hofmann, C. Fritsche, F. Stromberg, H. Wende, W. Keune, Physica Status Solidi 10 (2013) 1214–1217.
LibreCat | DOI
 
[81]
2013 | Conference Paper | LibreCat-ID: 64468
Ultrafast spin-polarized vertical-cavity surface-emitting lasers
N.C. Gerhardt, H. Höpfner, M. Lindemann, M. Li, H. Jähme, M. Hofmann, T. Ackemann, in: Spintronics VI, 2013, pp. 8313–80.
LibreCat | DOI
 
[80]
2013 | Journal Article | LibreCat-ID: 64455
Nonexponential photoluminescence transients in a Ga(NAsP) lattice matched to a (001) silicon substrate
N. Koukourakis, N.C. Gerhardt, M. Hofmann, B. Kunert, S. Liebich, M. Zimprich, K. Volz, W. Stolz, F. Gebhard, S.D. Baranovskii, K. Jandieri, Physical Review 87 (2013).
LibreCat | DOI
 
[79]
2013 | Journal Article | LibreCat-ID: 64457
Comparison of different metrics for analysis and visualization in spectroscopic optical coherence tomography
V. Jaedicke, N.C. Gerhardt, M. Hofmann, S. Agcaer, F.E. Robles, M. Steinert, D. Jones, S. Goebel, H. Welp, Biomedical Optics Express 4 (2013) 2945–2961.
LibreCat | DOI
 
[78]
2013 | Conference Paper | LibreCat-ID: 64461
Quantitative phase analysis through scattering media by depth-filtered digital holography
V. Jaedicke, N. Koukourakis, A. Ad­in­da-Oug­ba, N.C. Gerhardt, M. Hofmann, S. Goebel, H. Wiethoff, H. Welp, C.J. Cogswell, T.G. Brown, J.-A. Conchello, T. Wilson, in: Three-Dimensional and Multidimensional Microscopy, 2013, pp. 85891J-85891J–8.
LibreCat | DOI
 
[77]
2013 | Journal Article | LibreCat-ID: 64458
Contrast enhancement methods in optical coherence tomography using spectral features
V. Jaedicke, N.C. Gerhardt, M. Hofmann, S. Agcaer, S. Goebel, H. Welp, Biomedical Engineering 58 (2013) 1–2.
LibreCat | DOI
 
[76]
2013 | Book Chapter | LibreCat-ID: 64462
Quantum dot spintronics - fundamentals and applications
A. Ludwig, H. Höpfner, N.C. Gerhardt, J. König, M.R. Hofmann, A. Wieck, B. Sothmann, J. Nannen, T. Kümmell, G. Bacher, in: Magnetic Nanostructures, 2013, pp. 235–268.
LibreCat | DOI
 
[75]
2013 | Dissertation | LibreCat-ID: 64454
"More than Moore" - novel photonic concepts for information technology
N.C. Gerhardt, F. für Elektrotechnik und Informationstechnik, “More than Moore” - Novel Photonic Concepts for Information Technology, 2013.
LibreCat
 
[74]
2013 | Conference Paper | LibreCat-ID: 64465
Spin injection, transport, and relaxation in spin light-emitting diodes - magnetic field effects
H. Höpfner, A. Ludwig, A. Ludwig, D. Reuter, A. Wieck, N.C. Gerhardt, M. Hofmann, C. Fritsche, F. Stromberg, H. Wendes, W. Keunes, in: Spintronics VI, 2013, pp. 8813–43.
LibreCat | DOI
 
[73]
2012 | Conference Paper | LibreCat-ID: 64476
Photoluminescence and optical gain of Ga(NAsP) heterostructures pseudomorphically grown on silicon (001) substrate
N. Koukourakis, D. Funke, N.C. Gerhardt, M.R. Hofmann, M. Klimasch, S. Liebich, M. Zimprich, B. Kunert, K. Volz, W. Stolz, J. Kubby, G.T. Reed, in: Silicon Photonics VII, 2012, pp. 1–6.
LibreCat | DOI
 
[72]
2012 | Conference Paper | LibreCat-ID: 64477
Room temperature spin relaxation in quantum dot based spin-optoelectronic devices
H. Höpfner, M. Li, A. Ludwig, A. Ludwig, D. Reuter, A. Wieck, N.C. Gerhardt, M. Hofmann, F. Stromberg, H. Wende, W. Keune, in: Ultrafast Phenomena and Nanophotonics XVI, 2012, pp. 1–7.
LibreCat | DOI
 
[71]
2012 | Journal Article | LibreCat-ID: 64485
Time-resolved photoluminescence and optical gain in Ga(NAsP) pseudomorphically grown on silicon
N. Koukourakis, N.C. Gerhardt, M.R. Hofmann, M. Klimasch, S. Liebich, D. Trusheim, M. Zimprich, K. Volz, W. Stolz, B. Kunert, 76th Jahrestagung Der DPG (76th Annual Conference of the DPG) and DPG-Frühjahrstagung (Spring Meeting) of the Condensed Matter Section (SKM) with Further DPG Divisions: Environmental Physics, Microprobes, Radiation and Medical Physics, as Well as the DPG Working Groups: Energy, Equal Opportunities, Industry and Business, Information, Philosophy of Physics, Physics and Disarmament, Young DPG (2012).
LibreCat
 
[70]
2012 | Journal Article | LibreCat-ID: 64483
Temperature dependence of the spin relaxation length in spin quantum dot LEDs
H. Höpfner, A. Ludwig, A. Ebbing, D. Reuter, A. Wieck, N.C. Gerhardt, M.R. Hofmann, F. Stromberg, H. Wende, W. Keune, C. Fritsche, 76th Jahrestagung Der DPG (76th Annual Conference of the DPG) and DPG-Frühjahrstagung (Spring Meeting) of the Condensed Matter Section (SKM) with Further DPG Divisions: Environmental Physics, Microprobes, Radiation and Medical Physics, as Well as the DPG Working Groups: Energy, Equal Opportunities, Industry and Business, Information, Philosophy of Physics, Physics and Disarmament, Young DPG (2012).
LibreCat
 
[69]
2012 | Journal Article | LibreCat-ID: 64482
System development for spectroscopic optical coherence tomography
V. Jaedicke, S. Agcaer, N.C. Gerhardt, M. Hofmann, S. Goebel, H. Wiethoff, H. Welp, Biomedical Engineering 57 (2012) 327.
LibreCat | DOI
 
[68]
2012 | Journal Article | LibreCat-ID: 64481
Spin-controlled vertical-cavity surface-emitting lasers
N.C. Gerhardt, M. Hofmann, Advances in Optical Technologies (2012) 268949-1-268949–15.
LibreCat | DOI
 
[67]
2012 | Conference Paper | LibreCat-ID: 64470
Analysis of birefringence controlled ultrafast polarization oscillations in spin vertical-cavity surface-emitting lasers
M. Li, N.C. Gerhardt, M. Hofmann, T. Ackemann, in: EOS Annual Meeting 2012 (EOSAM 2012), 2012, pp. 104–107.
LibreCat
 
[66]
2012 | Journal Article | LibreCat-ID: 64480
Spin relaxation dynamics in spin-LEDs
H. Höpfner, A. Ludwig, D. Reuter, A. Wieck, N.C. Gerhardt, M.R. Hofmann, C. Fritsche, F. Stromberg, H. Wende, W. Keune, 76th Jahrestagung Der DPG (76th Annual Conference of the DPG) and DPG-Frühjahrstagung (Spring Meeting) of the Condensed Matter Section (SKM) with Further DPG Divisions: Environmental Physics, Microprobes, Radiation and Medical Physics, as Well as the DPG Working Groups: Energy, Equal Opportunities, Industry and Business, Information, Philosophy of Physics, Physics and Disarmament, Young DPG (2012).
LibreCat
 
[65]
2012 | Journal Article | LibreCat-ID: 64472
Erratum: “Room temperature spin relaxation length in spin light-emitting diodes” - [Appl. Phys. Lett. 99, 051102 (2011)]
H. Soldat, M. Li, N.C. Gerhardt, M. Hofmann, A. Ludwig, A. Ebbing, D. Reuter, A. Wieck, F. Stromberg, W. Keune, H. Wende, Applied Physics Letters 100 (2012) 269902–1.
LibreCat | DOI
 
[64]
2012 | Journal Article | LibreCat-ID: 64473
High room-temperature optical gain in Ga(NAsP)/Si heterostructures
N. Koukourakis, N.C. Gerhardt, M. Hofmann, C. Bückers, D.A. Funke, S. Liebich, S.N. Chatterjee, C. Lange, M. Zimprich, K. Volz, W. Stolz, B. Kunert, S.W. Koch, Applied Physics Letters 100 (2012) 092107-1-092107–3.
LibreCat | DOI
 
[63]
2012 | Journal Article | LibreCat-ID: 64474
Magnetic field dependence of the spin relaxation length in spin light-emitting diodes
H. Höpfner, A. Ludwig, A. Ludwig, D. Reuter, A. Wieck, N.C. Gerhardt, M. Hofmann, C. Fritsche, F. Stromberg, H. Wende, W. Keune, Applied Physics Letters 101 (2012) 112402-1-112402–4.
LibreCat | DOI
 
[62]
2012 | Journal Article | LibreCat-ID: 64471
Depth-filtered digital holography
N. Koukourakis, V. Jaedicke, A. Ad­in­da-Oug­ba, N.C. Gerhardt, M. Hofmann, S. Goebel, H. Wiethoff, H. Höpfner, Optics Express 20 (2012) 22636–22648.
LibreCat | DOI
 
[61]
2012 | Conference Paper | LibreCat-ID: 64478
Signal processing for spectroscopic optical coherence tomography
V. Jaedicke, S. Agcaer, C.T. Kasseck, N.C. Gerhardt, M. Hofmann, S. Goebel, H. Welp, in: Proceedings of the 7th International Workshop on Biosignal Interpretation (BSI2012), 2012, pp. 224–227.
LibreCat
 
[60]
2012 | Journal Article | LibreCat-ID: 64475
Multispectral photoacoustic coded excitation using pseudorandom codes - 82231E
M. Beckmann, C.-S. Friedrich, M. Mienkina, N.C. Gerhardt, M. Hofmann, G. Schmitz, Photons plus Ultrasound (2012) 82231E-1-82231E–8.
LibreCat | DOI
 
[59]
2011 | Conference Paper | LibreCat-ID: 64497
Time-resolved photoluminescence and optical gain of Ga(NAsP) heterostructures pseudomorphically grown on silicon (001) substrate
N.C. Gerhardt, N. Koukourakis, D. Funke, M.R. Hofmann, M. Klimasch, B. Kunert, S. Liebich, D. Trusheim, M. Zimprich, K. Volz, W. Stolz, in: 2011 13th International Conference on Transparent Optical Networks (ICTON 2011), 2011, pp. 111–114.
LibreCat | DOI
 
[58]
2011 | Conference Paper | LibreCat-ID: 64494
Photoacoustic coded excitation using periodically perfect sequences
M. Beckmann, M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, M. Hofmann, G. Schmitz, in: 2011 IEEE International Ultrasonics Symposium (IUS 2011), 2011, pp. 1179–1182.
LibreCat | DOI
 
[57]
2011 | Conference Paper | LibreCat-ID: 64486
Modal gain and time-resolved photoluminescence of Ga(NAsP) heterostructures pseudomorphically grown on Silicon (001) substrate
N.C. Gerhardt, M.R. Hofmann, N. Koukourakis, D.A. Funke, B. Kunert, S. Liebich, D. Trusheim, M. Zimprich, C. Bückers, S.W. Koch, K. Volz, W. Stolz, in: 2011.
LibreCat
 
[56]
2011 | Conference Paper | LibreCat-ID: 64487
Modal gain and time-resolved photoluminescence of Ga(NAsP) heterostructures pseudomorphically grown on silicon (001) substrate
N.C. Gerhardt, M.R. Hofmann, N. Koukourakis, D.A. Funke, B. Kunert, S. Liebich, D. Trusheim, M. Zimprich, C. Bückers, S.W. Koch, K. Volz, W. Stolz, in: 2011.
LibreCat
 
[55]
2011 | Conference Paper | LibreCat-ID: 64496
Quantitative photoacoustic blood oxygenation measurement of whole porcine blood samples using a multi-wavelength semiconductor laser system
C.-S. Friedrich, M. Mienkina, N.C. Gerhardt, M. Beckmann, G. Schmitz, M.R. Hofmann, C. Brenner, M. Jörger, A. Strauß, in: Diffuse Optical Imaging III, 2011, pp. 1–9.
LibreCat | DOI
 
[54]
2011 | Journal Article | LibreCat-ID: 64495
Photorefractive two-wave mixing for image amplification in digital holography
N. Koukourakis, M. Li, R.Y.W. Lai, C. Brenner, N.C. Gerhardt, M. Hofmann, T. Abdelwahab, H. Höpfner, E. Darakis, Optics Express 19 (2011) 22004–22023.
LibreCat | DOI
 
[53]
2011 | Conference Paper | LibreCat-ID: 64493
Ex­pe­ri­men­tal eva­lua­ti­on of mul­tis­pec­tral pho­toa­coustic coded ex­ci­ta­ti­on using or­tho­go­nal uni­po­lar golay codes
M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, M. Hofmann, G. Schmitz, A. Eder, in: 442. Wilhelm Und Else Heraeus-Seminar “Molecular Imaging” in Bad Honnef, October 5th - 8th, 2009, 2011.
LibreCat
 
[52]
2011 | Conference Paper | LibreCat-ID: 64488
Modal gain and time-resolved photoluminescence of Ga(NAsP) heterostructures pseudomorphically grown on silicon (001) substrate
N.C. Gerhardt, M.R. Hofmann, N. Koukourakis, D.A. Funke, B. Kunert, S. Liebich, D. Trusheim, M. Zimprich, C. Bückers, S.W. Koch, K. Volz, W. Stolz, in: 2011.
LibreCat
 
[51]
2011 | Conference Paper | LibreCat-ID: 64489
Quantitative photoacoustic blood oxygenation measurement of whole porcine blood samples using a multi-wavelength semiconductor laser system
C. Brenner, N.C. Gerhardt, M.R. Hofmann, G. Schmitz, C.-S. Friedrich, M.P. Mienkina, M.F. Beckmann, M. Jörger, A. Strauß, in: 2011.
LibreCat
 
[50]
2011 | Conference Paper | LibreCat-ID: 64491
Modal gain and time-resolved photoluminescence of Ga(NAsP) heterostructures pseudomorphically grown on silicon (001) substrate
N.C. Gerhardt, M.R. Hofmann, N. Koukourakis, D.A. Funke, B. Kunert, S. Liebich, D. Trusheim, M. Zimprich, C. Buckers, S.W. Koch, K. Volz, W. Stolz, in: 2011.
LibreCat
 
[49]
2011 | Conference Paper | LibreCat-ID: 64490
Spectroscopic optical coherence tomography for substance identification
N.C. Gerhardt, M.R. Hofmann, V. Jaedicke, C. Kasseck, H. Wiethoff, S. Agcaer, H. Welp, in: 2011.
LibreCat
 
[48]
2011 | Journal Article | LibreCat-ID: 64492
Birefringence and spin controlled ultrafast polarization oscillations in vertical-cavity surface-emitting lasers
M. Li, H. Jähme, H. Soldat, N.C. Gerhardt, M. Hofmann, T. Ackemann, 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO Europe/EQEC 2011) (2011) 109.
LibreCat | DOI
 
[47]
2010 | Journal Article | LibreCat-ID: 64505
Multispectral photoacoustic coded excitation imaging using unipolar orthogonal Golay codes
M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, M.F. Schiffner, M. Hofmann, G. Schmitz, M.F. Beckmann, Optics Express 18 (2010) 9076–9087.
LibreCat | DOI
 
[46]
2010 | Journal Article | LibreCat-ID: 64502
Integrity of micro-hotplates during high-temperature operation monitored by digital holographic microscopy
R.Y.W. Lai, N. Koukourakis, N.C. Gerhardt, S. Hamann, M. Ehmann, K. Hackl, A. Ludwig, R. Meyer, M.R. Hofmann, E. Darakis, Journal of Microelectromechanical Systems 19 (2010) 1175–1179.
LibreCat | DOI
 
[45]
2010 | Journal Article | LibreCat-ID: 64500
Experimental evaluation of photoacoustic coded excitation using unipolar golay codes
M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, W.G. Wilkening, M. Hofmann, G. Schmitz, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 57 (2010) 1583–1593.
LibreCat | DOI
 
[44]
2010 | Conference Paper | LibreCat-ID: 64501
Gigahertz circular polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers
N.C. Gerhardt, M. Li, H. Jähme, H. Soldat, M.R. Hofmann, T. Ackemann, in: Conference on Lasers and Electro-Optics (CLEO) and Quantum Electronics and Laser Science Conference (QELS), 2010, 2010, pp. 1–2.
LibreCat | DOI
 
[43]
2010 | Conference Paper | LibreCat-ID: 64503
Modal gain analysis of GaNAsP heterostructures on silicon
N. Koukourakis, D. Funke, N.C. Gerhardt, M. Hofmann, B. Kunert, S. Liebich, S. Zinnkann, M. Zimprich, A. Beyer, S. Chatterjee, C. Bückers, S.W. Koch, K. Volz, W. Stolz, in: Frontiers in Optics, 2010.
LibreCat | DOI
 
[42]
2010 | Conference Paper | LibreCat-ID: 64506
Substance identification in spectroscopic optical coherence tomograhpy using pattern recognition
V. Jaedicke, C.T. Kasseck, N.C. Gerhardt, M. Hofmann, H. Welp, in: Frontiers in Optics, 2010.
LibreCat | DOI
 
[41]
2010 | Conference Paper | LibreCat-ID: 64499
Photorefractive two-wave mixing for image amplification in digital holography
N.C. Gerhardt, M.R. Hofmann, N. Koukourakis, Y.W. Lai, in: 2010.
LibreCat | DOI
 
[40]
2010 | Conference Paper | LibreCat-ID: 64504
Monospectral photoacoustic imaging using Legendre sequences
M. Beckmann, M. Mienkina, G. Schmitz, C.-S. Friedrich, N.C. Gerhardt, M.R. Hofmann, in: 2010 IEEE International Ultrasonics Symposium (IUS), 2010, pp. 386–389.
LibreCat | DOI
 
[39]
2010 | Conference Paper | LibreCat-ID: 64498
Modal gain analysis of GaNAsP heterostructures on silicon
N.C. Gerhardt, M.R. Hofmann, N. Koukourakis, D.A. Funke, B. Kunert, S. Liebich, S. Zinnkann, M. Zimprich, A. Beyer, S. Chatterjee, C. Bückers, S.W. Koch, K. Volz, W. Stolz, in: 2010.
LibreCat
 
[38]
2009 | Journal Article | LibreCat-ID: 64520
Op­ti­cal ve­ri­fi­ca­ti­on of gain in Ga(NAsP)/(BGa)(AsP) mul­ti-quan­tum-well he­te­rost­ruc­tu­res mo­no­li­thi­cal­ly grown lat­ti­ce-mat­ched on (001) si­li­con sub­stra­te
N.C. Gerhardt, N. Koukourakis, M. Hofmann, B. Kunert, I. Nemeth, S. Zinnkann, G. Lukin, T.B. Adams, R. Fritz, K. Volz, W. Stolz, C. Lange, N.S. Koester, D.J. Franzbach, S.N. Chatterjee, W.W. Rühle, Papers Presented at the 35th International Symposium on Compound Semiconductors (ISCS 2008), Rust, Germany, 21 - 24 September 2008 (2009) 1349–1523.
LibreCat
 
[37]
2009 | Conference Paper | LibreCat-ID: 64514
Gain characteristics and lasing of Ga(NAsP) multi-quantum well structures
N.C. Gerhardt, M. Hofmann, C. Lange, S.N. Chatterjee, B. Kunert, K. Volz, W. Stolz, W.W. Rühle, in: Papers Presented at the 9th International Workshop on Nonlinear Optics and Excitation Kinetics in Semiconductors (NOEKS 9), 2009, pp. 576–578.
LibreCat | DOI
 
[36]
2009 | Conference Paper | LibreCat-ID: 64519
New concepts for depth resolved holographic imaging based on spectrally tunable diode lasers
N. Koukourakis, C. Kasseck, N.C. Gerhardt, M. Hofmann, D. Rytz, S. Köber, M. Salvador, K. Meerholz, in: Conference on Lasers and Electro-Optics, 2009 and 2009 Quantum Electronics and Laser Science Conference, 2009, pp. 1253–1254.
LibreCat | DOI
 
[35]
2009 | Conference Paper | LibreCat-ID: 64517
Lasing of the III/V compound semiconductor Ga(NAsP) integrated lattice-matched to Si substrate
N.C. Gerhardt, B. Kunert, S. Liebich, M. Zimprich, S. Zinnkann, R. Fritz, K. Volz, W. Stolz, C. Lange, N.S. Köster, S.N. Chatterjee, W.W. Rühle, in: Group IV Photonics, 2009, pp. 199–201.
LibreCat | DOI
 
[34]
2009 | Journal Article | LibreCat-ID: 64511
Depth resolved holographic imaging with variable depth resolution using spectrally tunable diode laser
N. Koukourakis, M. Breede, N.C. Gerhardt, M. Hofmann, S. Köber, M. Salvador, K. Meerholz, Electronics Letters 45 (2009) 46–48.
LibreCat | DOI
 
[33]
2009 | Conference Paper | LibreCat-ID: 64523
Three-dimensional bone imaging: optical coherence tomography versus micro computer tomography
C. Kasseck, N.C. Gerhardt, T. Gambichler, M. Hofmann, M. Kratz, A. Torcasio, G.H. van Lenthe, K. Hoffmann, D.B. Jones, in: Optical Coherence Tomography and Coherence Techniques IV, 2009, p. 73721B.
LibreCat | DOI
 
[32]
2009 | Journal Article | LibreCat-ID: 64521
Single-shot holography for depth resolved three dimensional imaging
N. Koukourakis, C. Kasseck, N.C. Gerhardt, M. Hofmann, D. Rytz, Optics Express 17 (2009) 21015–21029.
LibreCat | DOI
 
[31]
2009 | Conference Paper | LibreCat-ID: 64518
Multispectral photoacoustic coded excitation using orthogonal unipolar golay codes
M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, M. Hofmann, G. Schmitz, in: Diagnostic Imaging, 2009, pp. 217–220.
LibreCat | DOI
 
[30]
2009 | Conference Paper | LibreCat-ID: 64516
Lasing in optically pumped Ga(NAsP)/(BGa)(AsP) heterstructures on Silicon
N.C. Gerhardt, N. Koukourakis, M. Hofmann, C. Lange, N.S. Köster, D.J. Franzbach, S.N. Chatterjee, W.W. Rühle, S. Zinnkann, S. Liebich, R. Nemeth, R. Fritz, K. Volz, W. Stolz, B. Kunert, in: Conference on Lasers and Electro-Optics, 2009 and 2009 Quantum Electronics and Laser Science Conference, 2009, pp. 1–2.
LibreCat | DOI
 
[29]
2009 | Conference Paper | LibreCat-ID: 64515
Laser operation of III/V compound material Ga(NAsP) grown lattice-matched on (001) Si substrate
N.C. Gerhardt, N. Koukourakis, M. Hofmann, B. Kunert, S. Liebich, S. Zinnkann, R. Nemeth, R. Fritz, K. Volz, W. Stolz, C. Lange, N.S. Köster, D.J. Franzbach, S.N. Chatterjee, W.W. Rühle, in: Device Research Conference, 2009, pp. 193–194.
LibreCat | DOI
 
[28]
2009 | Conference Paper | LibreCat-ID: 64513
Feasibility study of multispectral photoacoustic coded excitation using orthogonal unipolar Golay codes
M. Mienkina, G. Schmitz, C.-S. Friedrich, N.C. Gerhardt, M. Hofmann, A. Eder, in: 2009 IEEE Ultrasonics Symposium, 2009, pp. 108–111.
LibreCat | DOI
 
[27]
2009 | Journal Article | LibreCat-ID: 64512
Evaluation of Ferucarbotran (Resovist®) as a photoacoustic contrast agent
M. Mienkina, C.-S. Friedrich, K. Hensel, N.C. Gerhardt, M. Hofmann, G. Schmitz, Biomedical Engineering 54 (2009) 83–88.
LibreCat | DOI
 
[26]
2009 | Conference Paper | LibreCat-ID: 64522
Spin-con­trol­led op­to­elec­tro­nic de­vices
S. Hövel, N.C. Gerhardt, M. Hofmann, F.-Y. Lo, D. Reuter, A. Wieck, E.U. Schuster, W. Keune, in: Papers Presented at the 9th International Workshop on Nonlinear Optics and Excitation Kinetics in Semiconductors (NOEKS 9), 2009, pp. 436–439.
LibreCat | DOI
 
[25]
2009 | Conference Paper | LibreCat-ID: 64509
Compact semiconductor laser sources for photoacoustic imaging
C.-S. Friedrich, M. Mienkina, N.C. Gerhardt, G. Schmitz, M. Hofmann, M.-C. Wawreczko, in: Photons plus Ultrasound, 2009, pp. 1–7.
LibreCat | DOI
 
[24]
2009 | Conference Paper | LibreCat-ID: 64510
Comparison of coding techniques for photoacoustic coded excitation
M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, M.R. Hofmann, G. Schmitz, A. Eder, in: Proceedings, 2009, pp. 313–316.
LibreCat
 
[23]
2008 | Conference Paper | LibreCat-ID: 64524
Evaluation of simplex codes for photoacoustic coded excitation
C.-S. Friedrich, N.C. Gerhardt, M. Hofmann, G. Schmitz, M.P. Mienkina, A. Eder, in: 4th European Conference of the International Federation for Medical and Biological Engineering, 2008, pp. 444–447.
LibreCat | DOI
 
[22]
2008 | Conference Paper | LibreCat-ID: 64525
Simulation study of photoacoustic coded excitation using Golay codes
M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, M. Hofmann, G. Schmitz, A. Eder, in: IEEE Ultrasonics Symposium, 2008, 2008, pp. 1242–1245.
LibreCat | DOI
 
[21]
2007 | Conference Paper | LibreCat-ID: 64527
External-cavity diode laser utilizing a micromirror device for spectral tuning
M. Breede, C. Kasseck, C. Brenner, N.C. Gerhardt, M. Hofmann, R. Höfling, in: Optical Measurement Systems for Industrial Inspection V, 2007, pp. 1–11.
LibreCat | DOI
 
[20]
2007 | Journal Article | LibreCat-ID: 64528
Micromirror device controlled tunable diode laser
M. Breede, C. Kasseck, C. Brenner, N.C. Gerhardt, M. Hofmann, R. Höfling, Electronics Letters 43 (2007) 456–457.
LibreCat | DOI
 
[19]
2007 | Conference Paper | LibreCat-ID: 64529
Photoacoustic imaging of Fibrosarcoma using RGD-Cy 3 as a targeted contrast agent
M. Mienkina, C.-S. Friedrich, N.C. Gerhardt, K. Hensel, C. Brenner, M. Hofmann, G. Schmitz, K. Waldeck, in: IEEE Ultrasonics Symposium, 2007, 2007, pp. 2409–2412.
LibreCat | DOI
 
[18]
2007 | Journal Article | LibreCat-ID: 64526
Evaluation eines kommerziellen Ultraschallgeräts für den Einsatz im photoakustischen Reflexionsmodus
M. Mienkina, N.C. Gerhardt, M. Breede, C. Brenner, M. Hofmann, G. Schmitz, K. Waldeck, Biomedical Engineering 52 (2007) G2-1.
LibreCat
 
[17]
2007 | Journal Article | LibreCat-ID: 64531
Spin-controlled LEDs and VCSELs
S. Hövel, N.C. Gerhardt, C. Brenner, M. Hofmann, F.-Y. Lo, D. Reuter, A. Wieck, E.U. Schuster, W. Keune, Physica Status Solidi 204 (2007) 500–507.
LibreCat | DOI
 
[16]
2007 | Conference Paper | LibreCat-ID: 64530
Spectroscopic fourier domain optical coherence tomography
C. Kasseck, N.C. Gerhardt, M. Hofmann, K. Lehmann, in: Optical Coherence Tomography and Coherence Techniques III, 2007, pp. 1–9.
LibreCat | DOI
 
[15]
2006 | Dissertation | LibreCat-ID: 64534
Optische Verstärkung und Spin-kontrollierte Emission von Halbleiterlasern
N.C. Gerhardt, F. für Elektrotechnik und Informationstechnik, Optische Verstärkung Und Spin-Kontrollierte Emission von Halbleiterlasern, 2006.
LibreCat
 
[14]
2006 | Journal Article | LibreCat-ID: 64533
Experimentelle Charakterisierung von Ferucarbotran als photoakustisches Kontrastmittel
M. Mienkina, K. Hensel, N.T. Le, N.C. Gerhardt, E. Bründermann, M. Havenith, M. Hofmann, G. Schmitz, I. Kopf, Biomedical Engineering 51 (2006) 1–2.
LibreCat
 
[13]
2006 | Conference Paper | LibreCat-ID: 64532
Experimental characterization of ferucarbotran (Resovist ®) as a photoacoustic nanoparticle contrast agent
M. Mienkina, K. Hensel, N.T. Le, N.C. Gerhardt, C. Hansen, M. Hofmann, G. Schmitz, in: Proceedings, 2006, pp. 393–396.
LibreCat | DOI
 
[12]
2005 | Conference Paper | LibreCat-ID: 64536
Spin-controlled LEDs and VCSELs
N.C. Gerhardt, S. Hövel, C. Brenner, M. Hofmann, D. Reuter, A. Wieck, J. Yang, in: Physics and Simulation of Optoelectronic Devices XIII, 2005, pp. 221–229.
LibreCat | DOI
 
[11]
2005 | Journal Article | LibreCat-ID: 64535
Electron spin injection into GaAs from ferromagnetic contacts in remanence
N.C. Gerhardt, S. Hövel, C. Brenner, M. Hofmann, F.-Y. Lo, D. Reuter, A. Wieck, K. Westerholt, E.U. Schuster, W. Keune, Applied Physics Letters 87 (2005) 1–3.
LibreCat | DOI
 
[10]
2003 | Conference Paper | LibreCat-ID: 64538
Gain and emission dynamics of dilute nitride quantum well lasers
M. Hofmann, N.C. Gerhardt, in: Frontiers in Optics 2003, 2003.
LibreCat | DOI
 
[9]
2003 | Conference Paper | LibreCat-ID: 64539
Optical gain of 1.3 μm (GaIn)(NAs)/GaAs lasers - a comparison between theory and experiment
N.C. Gerhardt, N. Hofmann, W. Stolz, W. Koch, J. Hader, J.V. Moloney, A.Y. Egorov, H. Riechert, in: Special Section on Semiconductor Optoelectronics, 2003.
LibreCat
 
[8]
2003 | Journal Article | LibreCat-ID: 64540
Optical spectroscopy of 1.3 μm (GaIn)(NAs)/GaAs lasers
N.C. Gerhardt, M. Hofmann, W.W. Rühle, IEE Proceedings 150 (2003) 45–48.
LibreCat | DOI
 
[7]
2003 | Conference Paper | LibreCat-ID: 64537
Experimentelle Methoden zur Bestimmung der optischen Verstärkung von 1.3µm (GaIn)(NAs)/GaAs Halbleiterlasern
N.C. Gerhardt, M.R. Hofmann, in: Frühjahrstagung Des Arbeitskreises Festkörperphysik Bei Der DPG, 2003.
LibreCat
 
[6]
2002 | Journal Article | LibreCat-ID: 64541
Emission dynamics and optical gain of 1.3 \mum (GaIn)(NAs)/GaAs Lasers
M. Hofmann, N.C. Gerhardt, A. Wagner, C. Ellmers, F. Höhnsdorf, J. Koch, W. Stolz, S.W. Koch, W.W. Rühle, J. Hader, J.V. Moloney, E.P. O‘Reilly, B. Borchert, A.Y. Egorov, H. Riechert, H.C. Schneider, W.W. Chow, IEEE Journal of Quantum Electronics / Institute of Electrical and Electronics Engineers 38 (2002) 213–221.
LibreCat | DOI
 
[5]
2002 | Conference Paper | LibreCat-ID: 64542
Influence of growth conditions on the optical gain of 1.3 /spl mu/m (GaIn)(NAs)/GaAs lasers
N.C. Gerhardt, M. Hofmann, K. Hantke, W. Stolz, S.W. Koch, J. Hader, J.V. Moloney, A.Y. Egorov, H. Riechert, in: Conference Digest, 2002, pp. 85–86.
LibreCat | DOI
 
[4]
2001 | Conference Paper | LibreCat-ID: 64543
Emission dynamics of (GaIn)(NAs)/GaAs lasers emitting at 1.3 μm
M. Hofmann, N.C. Gerhardt, A. Wagner, C. Ellmers, F. Höhnsdorf, J. Koch, S. Leu, W. Stolz, W.W. Rühle, in: Physics and Simulation of Optoelectronic Devices IX, 2001, pp. 256–266.
LibreCat | DOI
 
[3]
2001 | Conference Paper | LibreCat-ID: 64545
Optische Verstärkung von (GaIn)(NAs)/GaAs Halbleiterlasern
M.R. Hofmann, N.C. Gerhardt, A. Wagner, C. Ellmers, F. Höhnsdorf, J. Koch, S.W. Koch, W.W. Rühle, J. Hader, J.V. Moloney, W. Stolz, in: 65. Physikertagung & Frühjahrstagung Des Arbeitskreises Festkörperphysik Bei Der DPG, 2001.
LibreCat
 
[2]
2001 | Conference Paper | LibreCat-ID: 64546
Physics of 1.3µm (GaIn)(NAs)/GaAs semiconductor lasers
M. Hofmann, N.C. Gerhardt, A. Wagner, W. Stolz, S.W. Koch, W.W. Rühle, J. Hader, in: LEOS 2001, 2001, pp. 326–327.
LibreCat | DOI
 
[1]
2001 | Book Chapter | LibreCat-ID: 64547
Spintronics - Spin electronics and optoelectronics in semiconductors
D. Hägele, N.C. Gerhardt, M. Hofmann, M. Oestreich, J. Hübner, M. Bender, W.W. Rühle, H. Kalt, T. Hartmann, P.J. Klar, W. Heimbrodt, W. Stolz, in: Advances in Solid State Physics 41, 2001, pp. 173–186.
LibreCat | DOI
 
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