@inproceedings{64393, author = {{Cherkashin, Maxim N. and Brenner, Carsten and Putro, Widodo Dwi and Döpke, Benjamin and Gerhardt, Nils Christopher and Hofmann, Martin R.}}, booktitle = {{Photons Plus Ultrasound: Imaging and Sensing 2017}}, title = {{{Dynamics of the photoacoustic response of single-element PZT transducers to pulse burst excitation}}}, doi = {{10.1117/12.2253051}}, year = {{2017}}, } @article{64384, author = {{Finkeldey, Markus and Göring, Lena and Brenner, Carsten and Hofmann, Martin and Gerhardt, Nils Christopher}}, journal = {{Optics express}}, number = {{16}}, pages = {{19398 -- 19407}}, title = {{{Depth-filtering in common-path digital holographic microscopy}}}, doi = {{10.1364/oe.25.019398}}, volume = {{25}}, year = {{2017}}, } @inproceedings{64388, author = {{Finkeldey, Markus and Schellenberg, Falk and Gerhardt, Nils Christopher and Hofmann, Martin and Göring, Lena}}, booktitle = {{Practical holography XXXI: Materials and Applications}}, title = {{{Backside imaging of a microcontroller with common-path digital holography}}}, doi = {{10.1117/12.2250903}}, year = {{2017}}, } @inproceedings{64395, author = {{Lindemann, Markus and Gerhardt, Nils Christopher and Hofmann, Martin R. and Pusch, Tobias and Michalzik, Rainer}}, booktitle = {{Vertical-Cavity Surface-Emitting Lasers XXI}}, title = {{{Investigations on polarization oscillation amplitudes in spin-VCSELs}}}, doi = {{10.1117/12.2252490}}, year = {{2017}}, } @inproceedings{64391, author = {{Besaga, Vira and Gerhardt, Nils Christopher and Hofmann, Martin R. and Maksimyak, Peter P.}}, booktitle = {{Novel Optical Systems Design and Optimization XX}}, title = {{{Common-path holographic objective for conventional photographic camera}}}, doi = {{10.1117/12.2273890}}, year = {{2017}}, } @inproceedings{64394, author = {{Lindemann, Markus and Hofmann, Martin R. and Gerhardt, Nils Christopher and Pusch, Tobias and Michalzik, Rainer}}, booktitle = {{Spintronics X}}, title = {{{High-frequency polarization dynamics in spin-lasers - pushing the limits}}}, doi = {{10.1117/12.2272972}}, year = {{2017}}, } @article{64403, author = {{Lindemann, Markus and Gerhardt, Nils Christopher and Hofmann, Martin R. and Pusch, Tobias and La Tona, Eros and Michalzik, Rainer}}, journal = {{2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC 2017)}}, pages = {{108}}, title = {{{Thermally induced birefringence tuning of 37 GHz in VCSELs}}}, doi = {{10.1109/cleoe-eqec.2017.8086349}}, volume = {{1}}, year = {{2017}}, } @article{64392, author = {{Finkeldey, Markus and Brenner, Carsten and Gerhardt, Nils Christopher and Hofmann, Martin R. and Göring, Lena}}, journal = {{DGaO-Proceedings}}, title = {{{Digital holographic microscopy of buried specimen using a common-path reflective setup}}}, volume = {{118}}, year = {{2017}}, } @inproceedings{24219, abstract = {{In this paper we present theoretical, simulated and measured data for a reader to tag communication RFID system at 5.8 GHz. First a theoretical link budget analysis for a reader to tag architecture is shown for a wireless industrial application at 1m distance. This includes a power budget of the passively powered transponder. The received power level of the backscattered data for the theoretical link budget is -52:5 dBm. For the first setup slot antennas are developed and measured in the anechoic chamber. The measured gain is 4.0 dB. The power of the backscatter data in setup 1 is -74:8 dBm. This corresponds to the theoretical link budget since, all losses such as cable or lower antenna gain are taken into account. Setup 2 is upgraded on the reader side with horn antennas. At 5.8 GHz, the gain reaches the value of 10.8 dB. The second setup shows improvement in the receiving backscattered power to a value of -62:4 dBm. Furthermore, as a solution to detect those transponders not presented in the main slope of the antenna, a steerable beam is introduced by means of a Rotman lens. On the topic of the passive transponder, different harvesting topologies at 5.8 GHz are investigated, and the efficiency simulation of the harvesting circuitry has been performed. The simulated efficiency of the implemented technique is 68 %.}}, author = {{Kuhn, Peter and Haddadian, Sanaz and Meyer, Frederic and Hoffmann, Marc and Grabmaier, Anton and Scheytt, Christoph and Kaiser, Thomas}}, booktitle = {{Smart SysTech 2017; European Conference on Smart Objects, Systems and Technologies}}, isbn = {{978-3-8007-4428-2}}, publisher = {{VDE ITG}}, title = {{{SHF RFID System for Automatic Process Optimization with Intelligent Tools}}}, year = {{2017}}, } @inproceedings{24222, abstract = {{This paper focuses on the design of a high efficiency cross-connected differential drive rectifier for next-generation passive RFID tags. To provide a realistic estimation of the transponders’power and efficiency requirements at 5.8 GHz, detailed link/power-budget analysis for various blocks of the tag chip is carried out. From link budget analysis realistic RF power levels are obtained and a rectifier with high conversion efficiency at low power levels is designed. Simulations based on a commercial 65nm CMOS technology investigate the suitability of the harvesting circuit for 5.8 GHz RFID tags.}}, author = {{Haddadian, Sanaz and Scheytt, Christoph and Kramer, Roland}}, booktitle = {{ANALOG 2017; 16th ITG/GMM-Symposium}}, pages = {{18}}, publisher = {{Technische Universität Berlin}}, title = {{{Energy Harvesting Analysis for Next Generation Passive RFID Tags}}}, year = {{2017}}, } @inproceedings{58667, abstract = {{In this work, an innovative approach for the design and structuring of teaching videos systematically using 3D animations is presented. The approach focuses on the quantitative description of electromagnetic fields and the mathematical methods and competencies required for this purpose, exemplarily with regard to an undergraduate electrical engineering course during the initial phase of corresponding degree programs. An essential part of this course is the spatial and time-dependent description of electromagnetic fields. For this purpose, students have to work with multiple integrals in 3D space and in different coordinate systems. Such subjects are typically covered only later in mathematics courses and without a technical context, therefore leading to major difficulties for many students. The videos presented in this work are intended to support students and lecturers to work with these subjects in an instructive fashion. The 3D animations allow for effectively clarifying complex connections between technical and mathematical aspects. The videos and their specific design are discussed with regard to didactic and technical considerations. Additionally, their integration with existing interventions for the course is described.}}, author = {{Hennig, Markus and Mertsching, Bärbel}}, booktitle = {{Proceedings of the 3rd International Conference on Higher Education Advances (HEAd’17)}}, publisher = {{Universitat Politècnica València}}, title = {{{Innovative 3D Animations for Teaching Electromagnetic Field Theory and its Mathematics in Undergraduate Engineering}}}, doi = {{10.4995/head17.2017.5327}}, year = {{2017}}, } @article{35, author = {{Linnenbank, Heiko and Grynko, Yevgen and Förstner, Jens and Linden, Stefan}}, issn = {{2047-7538}}, journal = {{Light: Science & Applications}}, keywords = {{tet_topic_opticalantenna, tet_topic_shg}}, number = {{1}}, pages = {{e16013}}, publisher = {{Springer Nature}}, title = {{{Second harmonic generation spectroscopy on hybrid plasmonic/dielectric nanoantennas}}}, doi = {{10.1038/lsa.2016.13}}, volume = {{5}}, year = {{2016}}, } @inproceedings{3543, author = {{Hildebrandt, Andre and Alhaddad, Samer and Hammer, Manfred and Förstner, Jens}}, booktitle = {{Integrated Optics: Devices, Materials, and Technologies XX}}, editor = {{Broquin, Jean-Emmanuel and Nunzi Conti, Gualtiero}}, keywords = {{tet_topic_waveguide}}, publisher = {{SPIE}}, title = {{{Oblique incidence of semi-guided waves on step-like folds in planar dielectric slabs: Lossless vertical interconnects in 3D integrated photonic circuits}}}, doi = {{10.1117/12.2214460}}, year = {{2016}}, } @article{3834, abstract = {{The problem of light scattering by ice crystals of cirrus clouds is considered in the case of a hexagonal ice plate with different distributions over crystal orientations. The physical-optics approximation based on (E, M)-diffraction theory is compared with two exact numerical methods: the finite difference time domain (FDTD) and the discontinuous Galerkin time domain (DGTD) in order to estimate its accuracy and limits of applicability. It is shown that the accuracy of the physical-optics approximation is estimated as 95% for the averaged backscattering Mueller matrix for particles with size parameter more than 120. Furthermore, the simple expression that allows one to estimate the minimal number of particle orientations required for appropriate spatial averaging has been derived.}}, author = {{Konoshonkin, Alexander and Borovoi, Anatoli and Kustova, Natalia and Okamoto, Hajime and Ishimoto, Hiroshi and Grynko, Yevgen and Förstner, Jens}}, issn = {{0022-4073}}, journal = {{Journal of Quantitative Spectroscopy and Radiative Transfer}}, keywords = {{tet_topic_scattering}}, pages = {{132--140}}, publisher = {{Elsevier BV}}, title = {{{Light scattering by ice crystals of cirrus clouds: From exact numerical methods to physical-optics approximation}}}, doi = {{10.1016/j.jqsrt.2016.12.024}}, volume = {{195}}, year = {{2016}}, } @inproceedings{3840, abstract = {{In the problem of light scattering by ice crystals of cirrus clouds, two exact methods (FDTD – finite difference time domain and DGTD – discontinuous Galerkin time domain) and the physical-optics approximation are used for numerical calculations of the Mueller matrix in the case of ice hexagonal plates and columns. It is shown that for the crystals larger than 10 μm at the wavelength of 0.532 μm the exact methods and physical-optics approximation closely agreed within three diffraction fringes about the centers of the diffraction patterns. As a result, in the case of random orientation of these crystals, the physical-optics approximation provides accuracy 95% for the averaged Mueller matrix.}}, author = {{Konoshonkin, Alexander V. and Kustova, Natalia V. and Borovoi, Anatoli G. and Okamoto, H. and Sato, K. and Ishimoto, H. and Grynko, Yevgen and Förstner, Jens}}, booktitle = {{22nd International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics}}, editor = {{Matvienko, Gennadii G. and Romanovskii, Oleg A.}}, keywords = {{tet_topic_scattering}}, publisher = {{SPIE}}, title = {{{Comparison between the physical-optics approximation and exact methods solving the problem of light scattering by ice crystals of cirrus clouds}}}, doi = {{10.1117/12.2248409}}, year = {{2016}}, } @article{3841, abstract = {{We present phase sensitive cavity field measurements on photonic crystal microcavities. The experiments have been performed as autocorrelation measurements with ps double pulse laser excitation for resonant and detuned conditions. Measured E-field autocorrelation functions reveal a very strong detuning dependence of the phase shift between laser and cavity field and of the autocorrelation amplitude of the cavity field. The fully resolved phase information allows for a precise frequency discrimination and hence for a precise measurement of the detuning between laser and cavity. The behavior of the autocorrelation amplitude and phase and their detuning dependence can be fully described by an analytic model. Furthermore, coherent control of the cavity field is demonstrated by tailored laser excitation with phase and amplitude controlled pulses. The experimental proof and verification of the above described phenomena became possible by an electric detection scheme, which employs planar photonic crystal microcavity photo diodes with metallic Schottky contacts in the defect region of the resonator. The applied photo current detection was shown to work also efficiently at room temperature, which make electrically contacted microcavities attractive for real world applications.}}, author = {{Quiring, Wadim and Jonas, Björn and Förstner, Jens and Rai, Ashish K. and Reuter, Dirk and Wieck, Andreas D. and Zrenner, Artur}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{tet_topic_phc}}, number = {{18}}, pages = {{20672--20684}}, publisher = {{The Optical Society}}, title = {{{Phase sensitive properties and coherent manipulation of a photonic crystal microcavity}}}, doi = {{10.1364/oe.24.020672}}, volume = {{24}}, year = {{2016}}, } @article{3843, abstract = {{We simulate light scattering by random irregular particles that have dimensions much larger than the wavelength of incident light at the size parameter of 𝑋=200 using the discontinuous Galerkin time domain method. A comparison of the DGTD solution for smoothly faceted particles with that obtained with a geometric optics model shows good agreement for the scattering angle curves of intensity and polarization. If a wavelength-scale surface roughness is introduced, diffuse scattering at rough interface results in smooth and featureless curves for all scattering matrix elements which is consistent with the laboratory measurements of real samples.}}, author = {{Grynko, Yevgen and Shkuratov, Yuriy and Förstner, Jens}}, issn = {{0146-9592}}, journal = {{Optics Letters}}, keywords = {{tet_topic_scattering}}, number = {{15}}, pages = {{3491--3493}}, publisher = {{The Optical Society}}, title = {{{Light scattering by irregular particles much larger than the wavelength with wavelength-scale surface roughness}}}, doi = {{10.1364/ol.41.003491}}, volume = {{41}}, year = {{2016}}, } @article{3849, abstract = {{The physical optics approximations are derived from the Maxwell equations. The scattered field equations by Kirchhoff, Stratton-Chu, Kottler and Franz are compared and discussed. It is shown that in the case of faceted particles, these equations reduce to a sum of the diffraction integrals, where every diffraction integral is associated with one plane–parallel optical beam leaving a particle facet. In the far zone, these diffraction integrals correspond to the Fraunhofer diffraction patterns. The paper discusses the E-, M- and (E, M)-diffraction theories as applied to ice crystals of cirrus clouds. The comparison to the exact solution obtained by the discontinuous Galerkin time domain method shows that the Kirchhoff diffraction theory is preferable.}}, author = {{Konoshonkin, Alexander V. and Kustova, Natalia V. and Borovoi, Anatoli G. and Grynko, Yevgen and Förstner, Jens}}, issn = {{0022-4073}}, journal = {{Journal of Quantitative Spectroscopy and Radiative Transfer}}, keywords = {{tet_topic_scattering}}, pages = {{12--23}}, publisher = {{Elsevier BV}}, title = {{{Light scattering by ice crystals of cirrus clouds: comparison of the physical optics methods}}}, doi = {{10.1016/j.jqsrt.2016.05.006}}, volume = {{182}}, year = {{2016}}, } @article{3884, abstract = {{e study the discrete soliton formation in one- and two- dimensional arrays of nanowires coated with graphene monolayers. Highly confined solitons, including the fundamental and the higher-order modes, are found to be supported by the proposed structure with a low level of power flow. Numerical analysis reveals that, by tuning the input intensity and Fermi energy, the beam diffraction, soliton dimension and propagation loss can be fully controlled in a broad range, indicating potential values of the graphene-based solitons in nonlinear/active nanophotonic systems. }}, author = {{Kou, Yao and Förstner, Jens}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{tet_topic_plasmonics, tet_topic_polariton}}, number = {{5}}, pages = {{4714}}, publisher = {{The Optical Society}}, title = {{{Discrete plasmonic solitons in graphene-coated nanowire arrays}}}, doi = {{10.1364/oe.24.004714}}, volume = {{24}}, year = {{2016}}, } @article{3886, abstract = {{ We report on second harmonic generation spectroscopy on a series of rectangular arrays of split-ring resonators. Within the sample series, the lattice constants are varied, but the area of the unit cell is kept fixed. The SHG signal intensity of the different arrays upon resonant excitation of the fundamental plasmonic mode strongly depends on the respective arrangement of the split-ring resonators. This finding can be explained by variations of the electromagnetic interactions between the split-ring resonators in the different arrays. The experimental results are in agreement with numerical calculations based on the discontinuous Galerkin time-domain method. (PDF) The role of electromagnetic interactions.... Available from: https://www.researchgate.net/publication/297612326_The_role_of_electromagnetic_interactions_in_second_harmonic_generation_from_plasmonic_metamaterials [accessed Aug 13 2018].}}, author = {{Alberti, Julian and Linnenbank, Heiko and Linden, Stefan and Grynko, Yevgen and Förstner, Jens}}, issn = {{0946-2171}}, journal = {{Applied Physics B}}, keywords = {{tet_topic_shg, tet_topic_meta}}, number = {{2}}, pages = {{45--50}}, publisher = {{Springer Nature}}, title = {{{The role of electromagnetic interactions in second harmonic generation from plasmonic metamaterials}}}, doi = {{10.1007/s00340-015-6311-x}}, volume = {{122}}, year = {{2016}}, }