@article{7027, author = {{Scholz, Sven and Schott, Rüdiger and Labud, Patrick A. and Somsen, Christoph and Reuter, Dirk and Ludwig, Arne and Wieck, Andreas D.}}, issn = {{0022-0248}}, journal = {{Journal of Crystal Growth}}, pages = {{46--50}}, publisher = {{Elsevier BV}}, title = {{{Focused ion beam supported growth of monocrystalline wurtzite InAs nanowires grown by molecular beam epitaxy}}}, doi = {{10.1016/j.jcrysgro.2017.04.013}}, volume = {{470}}, year = {{2017}}, } @article{7028, author = {{Kuznetsova, M. S. and Cherbunin, R. V. and Gerlovin, I. Ya. and Ignatiev, I. V. and Verbin, S. Yu. and Yakovlev, D. R. and Reuter, Dirk and Wieck, A. D. and Bayer, M.}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{15}}, publisher = {{American Physical Society (APS)}}, title = {{{Spin dynamics of quadrupole nuclei in InGaAs quantum dots}}}, doi = {{10.1103/physrevb.95.155312}}, volume = {{95}}, year = {{2017}}, } @article{7029, author = {{Srinivasan, A. and Miserev, D. S. and Hudson, K. L. and Klochan, O. and Muraki, K. and Hirayama, Y. and Reuter, Dirk and Wieck, A. D. and Sushkov, O. P. and Hamilton, A. R.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, number = {{14}}, publisher = {{American Physical Society (APS)}}, title = {{{Detection and Control of Spin-Orbit Interactions in a GaAs Hole Quantum Point Contact}}}, doi = {{10.1103/physrevlett.118.146801}}, volume = {{118}}, year = {{2017}}, } @inproceedings{3988, author = {{Riedl, Thomas and Kunnathully, Vinay and Karlisch, A. and Reuter, Dirk and Weber, N. and Meier, Cedrik and Schierholz, R. and Lindner, Jörg}}, location = {{Straßburg (France)}}, title = {{{Morphology, structure and enhanced PL of molecular beam epitaxial In0.2Ga0.8As layers on nanopillar patterned GaAs}}}, year = {{2017}}, } @article{4359, author = {{Prajongtat, Pongthep and Sriyab, Suwannee and Zentgraf, Thomas and Hannongbua, Supa}}, issn = {{0026-8976}}, journal = {{Molecular Physics}}, number = {{1}}, pages = {{9--18}}, publisher = {{Informa UK Limited}}, title = {{{Optimisation of stability and charge transferability of ferrocene-encapsulated carbon nanotubes}}}, doi = {{10.1080/00268976.2017.1359348}}, volume = {{116}}, year = {{2017}}, } @article{6540, abstract = {{Coherent phonons can greatly vary light–matter interaction in semiconductor nanostructures placed inside an optical resonator on a picosecond time scale. For an ensemble of quantum dots (QDs) as active laser medium, phonons are able to induce a large enhancement or attenuation of the emission intensity, as has been recently demonstrated. The physics of this coupled phonon–exciton–light system consists of various effects, which in the experiment typically cannot be clearly separated, in particular, due to the complicated sample structure a rather complex strain pulse impinges on the QD ensemble. Here we present a comprehensive theoretical study how the laser emission is affected by phonon pulses of various shapes as well as by ensembles with different spectral distributions of the QDs. This gives insight into the fundamental interaction dynamics of the coupled phonon–exciton–light system, while it allows us to clearly discriminate between two prominent effects: the adiabatic shifting of the ensemble and the shaking effect. This paves the way to a tailored laser emission controlled by phonons.}}, author = {{Wigger, Daniel and Czerniuk, Thomas and Reiter, Doris E and Bayer, Manfred and Kuhn, Tilmann}}, issn = {{1367-2630}}, journal = {{New Journal of Physics}}, number = {{7}}, publisher = {{IOP Publishing}}, title = {{{Systematic study of the influence of coherent phonon wave packets on the lasing properties of a quantum dot ensemble}}}, doi = {{10.1088/1367-2630/aa78bf}}, volume = {{19}}, year = {{2017}}, } @article{6541, abstract = {{We report on the coherent optical response from an ensemble of (In,Ga)As quantum dots (QDs) embedded in a planar Tamm-plasmon microcavity with a quality factor of approximately 100. Significant enhancement of the light-matter interaction is demonstrated under selective laser excitation of those quantum dots which are in resonance with the cavity mode. The enhancement is manifested through Rabi oscillations of the photon echo, demonstrating coherent control of excitons with picosecond pulses at intensity levels more than an order of magnitude smaller as compared with bare quantum dots. The decay of the photon echo transients is weakly changed by the resonator, indicating a small decrease of the coherence time T2 which we attribute to the interaction with the electron plasma in the metal layer located close (40 nm) to the QD layer. Simultaneously we see a reduction of the population lifetime T1, inferred from the stimulated photon echo, due to an enhancement of the spontaneous emission by a factor of 2, which is attributed to the Purcell effect, while nonradiative processes are negligible, as confirmed from time-resolved photoluminescence.}}, author = {{Salewski, M. and Poltavtsev, S. V. and Kapitonov, Yu. V. and Vondran, J. and Yakovlev, D. R. and Schneider, C. and Kamp, M. and Höfling, S. and Oulton, R. and Akimov, I. A. and Kavokin, A. V. and Bayer, M.}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{3}}, publisher = {{American Physical Society (APS)}}, title = {{{Photon echoes from (In,Ga)As quantum dots embedded in a Tamm-plasmon microcavity}}}, doi = {{10.1103/physrevb.95.035312}}, volume = {{95}}, year = {{2017}}, } @article{6542, abstract = {{Transient changes of the optical response of WS2 monolayers are studied by femtosecond broadband pump–probe spectroscopy. Time-dependent absorption spectra are analyzed by tracking the line width broadening, bleaching, and energy shift of the main exciton resonance as a function of time delay after the excitation. Two main sources for the pump-induced changes of the optical response are identified. Specifically, we find an interplay between modifications induced by many-body interactions from photoexcited carriers and by the subsequent transfer of the excitation to the phonon system followed by cooling of the material through the heat transfer to the substrate.}}, author = {{Ruppert, Claudia and Chernikov, Alexey and Hill, Heather M. and Rigosi, Albert F. and Heinz, Tony F.}}, issn = {{1530-6984}}, journal = {{Nano Letters}}, keywords = {{Atomically thin 2D materials, carrier and phonon dynamics, ultrafast spectroscopy}}, number = {{2}}, pages = {{644--651}}, publisher = {{American Chemical Society (ACS)}}, title = {{{The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation}}}, doi = {{10.1021/acs.nanolett.6b03513}}, volume = {{17}}, year = {{2017}}, } @article{6543, abstract = {{Up to 400 mW of near-IR (1370-1500 nm) femtosecond pulses are generated from an optical parametric amplifier directly driven by a Yb:fiber oscillator delivering 100\&\#x00A0;fs pulses at 1036 nm. The process is seeded by a stable supercontinuum obtained from a photonic crystal fiber. We use a single pass through a 3 mm, magnesium oxide-doped, periodically poled LiNbO3 downconversion crystal to produce a near-IR pulse train with a remarkable power stability of 1.4 % (RMS) during one hour. Tuning is achieved by the temperature and the poling period of the nonlinear crystal.}}, author = {{Mundry, J. and Lohrenz, J. and Betz, M.}}, journal = {{Applied Optics}}, keywords = {{Infrared and far-infrared lasers, Ultrafast lasers, Nonlinear optics, parametric processes, Parametric oscillators and amplifiers, Femtosecond pulses, Fiber lasers, Fused silica, Laser systems, Photonic crystal fibers, Pulse propagation}}, number = {{11}}, pages = {{3104--3108}}, publisher = {{OSA}}, title = {{{Tunable femtosecond near-IR source by pumping an OPA directly with a 90 MHz Yb:fiber source}}}, doi = {{10.1364/AO.56.003104}}, volume = {{56}}, year = {{2017}}, } @article{6544, abstract = {{A picosecond acoustic pulse can be used to control the lasing emission from semiconductor nanostructures by shifting their electronic transitions. When the active medium, here an ensemble of (In,Ga)As quantum dots, is shifted into or out of resonance with the cavity mode, a large enhancement or suppression of the lasing emission can dynamically be achieved. Most interesting, even in the case when gain medium and cavity mode are in resonance, we observe an enhancement of the lasing due to shaking by coherent phonons. In order to understand the interactions of the nonlinearly coupled photon-exciton-phonon subsystems, we develop a semiclassical model and find an excellent agreement between theory and experiment.}}, author = {{Czerniuk, T. and Wigger, D. and Akimov, A. V. and Schneider, C. and Kamp, M. and Höfling, S. and Yakovlev, D. R. and Kuhn, T. and Reiter, D. E. and Bayer, M.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, number = {{13}}, publisher = {{American Physical Society (APS)}}, title = {{{Picosecond Control of Quantum Dot Laser Emission by Coherent Phonons}}}, doi = {{10.1103/physrevlett.118.133901}}, volume = {{118}}, year = {{2017}}, } @article{6545, abstract = {{We develop a nanoscopy method with in-depth resolution for layered photonic devices. Photonics often requires tailored light field distributions for the optical modes used, and an exact knowledge of the geometry of a device is crucial to assess its performance. The presented acousto-optical nanoscopy method is based on the uniqueness of the light field distributions in photonic devices: for a given wavelength, we record the reflectivity modulation during the transit of a picosecond acoustic pulse. The temporal profile obtained can be linked to the internal light field distribution. From this information, a reverse-engineering procedure allows us to reconstruct the light field and the underlying photonic structure very precisely. We apply this method to the slow light mode of an AlAs/GaAs micropillar resonator and show its validity for the tailored experimental conditions.}}, author = {{Czerniuk, T. and Schneider, C. and Kamp, M. and Höfling, S. and Glavin, B. A. and Yakovlev, D. R. and Akimov, A. V. and Bayer, M.}}, issn = {{2334-2536}}, journal = {{Optica}}, number = {{6}}, publisher = {{The Optical Society}}, title = {{{Acousto-optical nanoscopy of buried photonic nanostructures}}}, doi = {{10.1364/optica.4.000588}}, volume = {{4}}, year = {{2017}}, } @article{682, author = {{Weber, Nils and Protte, Maximilian and Walter, Felicitas and Georgi, Philip and Zentgraf, Thomas and Meier, Cedrik}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{20}}, publisher = {{American Physical Society (APS)}}, title = {{{Double resonant plasmonic nanoantennas for efficient second harmonic generation in zinc oxide}}}, doi = {{10.1103/physrevb.95.205307}}, volume = {{95}}, year = {{2017}}, } @article{684, author = {{Walter, Felicitas and Li, Guixin and Meier, Cedrik and Zhang, Shuang and Zentgraf, Thomas}}, issn = {{1530-6984}}, journal = {{Nano Letters}}, number = {{5}}, pages = {{3171--3175}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Ultrathin Nonlinear Metasurface for Optical Image Encoding}}}, doi = {{10.1021/acs.nanolett.7b00676}}, volume = {{17}}, year = {{2017}}, } @article{24211, abstract = {{A fully-differential receiver structure for fiber links is presented, in which the photodiode (PD) is DC-coupled to the transimpedance amplifier (TIA) and biased through the feedback resistors. The biasing voltage is defined by the internal structure of the input stage. Different options are suggested that allow to adjust PD biasing. Multiple architecture variants are proposed, that were implemented in 0.25μm SiGe BiCMOS technology. Initial measurement results are reported, proving the feasibility of the concept. A 25Gbps hybrid receiver designed to comply with a specific standard is also presented, featuring large horizontal eye opening of 800mV, OMA of -15dBm at BER of 10 -6 and power dissipation of 330mW from a single 3.3V power supply.}}, author = {{Gudyriev, Sergiy and Scheytt, Christoph and Yan, Lei and Christian, Meuer and Zimmermann, Lars}}, issn = {{ 2378-590X}}, journal = {{IEEE Bipolar/BiCMOS Circuits and Technology Meeting}}, title = {{{Fully-differential, DC-coupled, Self-biased, Monolithically-integrated Optical Receiver in 0.25μm Photonic BiCMOS Technology for Multi-channel Fiber Links}}}, doi = {{10.1109/BCTM.2017.8112922}}, year = {{2017}}, } @inproceedings{24226, author = {{Scheytt, Christoph}}, booktitle = {{W3+Fair on Optoelectronics, Electronics, and Mechanics}}, title = {{{Silicon Photonics Microsystems for Communications and Sensing}}}, year = {{2017}}, } @article{3997, abstract = {{Switchable two dimensional liquid crystal diffraction gratings are promising can- didates in beam steering devices, multiplexers and holographic displays. For these areas of applications a high degree of integration in optical systems is much sought-after. In the context of diffraction gratings this means that the angle of diffraction should be rather high, which typically poses a problem as the fabrication of small grating periods is challenging. In this paper, we propose the use of nanosphere lithography (NSL) for the fabrication of two-dimensionally structured electrodes with a periodicity of a few micrometers. NSL is based on the self-assembly of micro- or nanometer sized spheres into monolayers. It allows for easy substrate structuring on wafer scale. The manufactured electrode is combined with a liquid crystalline polymer-stabilized blue phase, which facilitates sub-millisecond electrical switching of the diffraction efficiency at adiffractionangle of 21.4°.}}, author = {{Wahle, M. and Brassat, Katharina and Ebel, J. and Bürger, Julius and Lindner, Jörg and Kitzerow, Heinz-Siegfried}}, journal = {{Optics Express 25}}, number = {{19}}, pages = {{22608--22619}}, title = {{{Two-dimensional switchable blue phase gratings manufactured by nanosphere lithography}}}, doi = {{10.1364/OE.25.022607}}, volume = {{25}}, year = {{2017}}, } @article{3434, abstract = {{In this work we study the impact of ion implantation on the nonlinear optical properties in MgO:LiNbO3 via confocal second-harmonic microscopy. In detail, we spatially characterize the nonlinear susceptibility in carbon-ion implanted lithium niobate planar waveguides for different implantation energies and fluences, as well as the effect of annealing. In a further step, a computational simulation is used to calculate the implantation range of carbon-ions and the corresponding defect density distribution. A comparison between the simulation and the experimental data indicates that the depth profile of the second-order effective nonlinear coefficient is directly connected to the defect density that is induced by the ion irradiation. Furthermore it can be demonstrated that the annealing treatment partially recovers the second-order optical susceptibility.}}, author = {{Spychala, Kai J. and Berth, Gerhard and Widhalm, Alex and Rüsing, Michael and Wang, Lei and Sanna, Simone and Zrenner, Artur}}, issn = {{1094-4087}}, journal = {{OPTICS EXPRESS}}, number = {{18}}, pages = {{21444----21453}}, title = {{{Impact of carbon-ion implantation on the nonlinear optical susceptibility of LiNbO3}}}, doi = {{10.1364/OE.25.021444}}, year = {{2017}}, } @article{39665, author = {{Knust, Steffen and Wahle, Markus and Kitzerow, Heinz-Siegfried}}, issn = {{1520-6106}}, journal = {{The Journal of Physical Chemistry B}}, keywords = {{Materials Chemistry, Surfaces, Coatings and Films, Physical and Theoretical Chemistry}}, number = {{19}}, pages = {{5110--5115}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Ferroelectric Liquid Crystals in Microcapillaries: Observation of Different Electro-optic Switching Mechanisms}}}, doi = {{10.1021/acs.jpcb.7b00307}}, volume = {{121}}, year = {{2017}}, } @article{39663, author = {{Vollbrecht, Joachim and Blazy, Simon and Dierks, Philipp and Peurifoy, Samuel and Bock, Harald and Kitzerow, Heinz-Siegfried}}, issn = {{1439-4235}}, journal = {{ChemPhysChem}}, keywords = {{Physical and Theoretical Chemistry, Atomic and Molecular Physics, and Optics}}, number = {{15}}, pages = {{2024--2032}}, publisher = {{Wiley}}, title = {{{Electroluminescent and Optoelectronic Properties of OLEDs with Bay-Extended, Distorted Perylene Esters as Emitter Materials}}}, doi = {{10.1002/cphc.201700502}}, volume = {{18}}, year = {{2017}}, } @inproceedings{4002, author = {{Kitzerow, Heinz-Siegfried and Lindner, Jörg}}, location = {{Barcelona (Spain)}}, title = {{{Plasmonic nanostructures: spectroscopy and electron microscopy}}}, year = {{2017}}, }