@article{8798, author = {{Atorf, Bernhard and Friesen, Simon and Rennerich, Roman and Mühlenbernd, Holger and Zentgraf, Thomas and Kitzerow, Heinz-Siegfried}}, issn = {{1811-2382}}, journal = {{Polymer Science, Series C}}, pages = {{55--62}}, title = {{{Switchable Plasmonic Metasurface Utilizing the Electro-Optic Kerr Effect of a Blue Phase Liquid Crystal}}}, doi = {{10.1134/s1811238218010010}}, volume = {{60}}, year = {{2018}}, } @article{1764, author = {{Atorf, Bernhard and Rasouli, Hoda and Mühlenbernd, Holger and Reineke, Bernhard J. and Zentgraf, Thomas and Kitzerow, Heinz-Siegfried}}, issn = {{1932-7447}}, journal = {{The Journal of Physical Chemistry C}}, number = {{8}}, pages = {{4600--4606}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Switchable Plasmonic Holograms Utilizing the Electro-Optic Effect of a Liquid-Crystal Circular Polarizer}}}, doi = {{10.1021/acs.jpcc.7b12609}}, volume = {{122}}, year = {{2018}}, } @article{13871, author = {{Atorf, Bernhard and Friesen, Simon and Rennerich, Roman and Mühlenbernd, Holger and Zentgraf, Thomas and Kitzerow, Heinz-Siegfried}}, issn = {{1811-2382}}, journal = {{Polymer Science, Series C}}, pages = {{55--62}}, title = {{{Switchable Plasmonic Metasurface Utilizing the Electro-Optic Kerr Effect of a Blue Phase Liquid Crystal}}}, doi = {{10.1134/s1811238218010010}}, year = {{2018}}, } @article{22244, author = {{Vollbrecht, Joachim and Oechsle, Peter and Stepen, Arne and Hoffmann, Florian and Paradies, Jan and Meyers, Thorsten and Hilleringmann, Ulrich and Schmidtke, Jürgen and Kitzerow, Heinz-Siegfried}}, issn = {{1566-1199}}, journal = {{Organic Electronics}}, pages = {{266--275}}, title = {{{Liquid crystalline dithienothiophene derivatives for organic electronics}}}, doi = {{10.1016/j.orgel.2018.06.002}}, year = {{2018}}, } @article{4769, abstract = {{In recent years, Raman spectroscopy has been used to visualize and analyze ferroelectric domain structures. The technique makes use of the fact that the intensity or frequency of certain phonons is strongly influenced by the presence of domain walls. Although the method is used frequently, the underlying mechanism responsible for the changes in the spectra is not fully understood. This inhibits deeper analysis of domain structures based on this method. Two different models have been proposed. However, neither model completely explains all observations. In this work, we have systematically investigated domain walls in different scattering geometries with Raman spectroscopy in the common ferroelectric materials used in integrated optics, i.e., KTiOPO4, LiNbO3, and LiTaO3. Based on the two models, we can demonstrate that the observed contrast for domain walls is in fact based on two different effects. We can identify on the one hand microscopic changes at the domain wall, e.g., strain and electric fields, and on the other hand a macroscopic change of selection rules at the domain wall. While the macroscopic relaxation of selection rules can be explained by the directional dispersion of the phonons in agreement with previous propositions, the microscopic changes can be explained qualitatively in terms of a simplified atomistic model.}}, author = {{Rüsing, Michael and Neufeld, Sergej and Brockmeier, Julian and Eigner, Christof and Mackwitz, P. and Spychala, K. and Silberhorn, Christine and Schmidt, Wolf Gero and Berth, Gerhard and Zrenner, Artur and Sanna, S.}}, issn = {{2475-9953}}, journal = {{Physical Review Materials}}, number = {{10}}, publisher = {{American Physical Society (APS)}}, title = {{{Imaging of 180∘ ferroelectric domain walls in uniaxial ferroelectrics by confocal Raman spectroscopy: Unraveling the contrast mechanism}}}, doi = {{10.1103/physrevmaterials.2.103801}}, volume = {{2}}, year = {{2018}}, } @article{20588, abstract = {{We have investigated the stacking of self-assembled cubic GaN quantum dots (QDs) grown in Stranski–Krastanov (SK) growth mode. The number of stacked layers is varied to compare their optical properties. The growth is in situ controlled by reflection high energy electron diffraction to prove the SK QD growth. Atomic force and transmission electron microscopy show the existence of wetting layer and QDs with a diameter of about 10 nm and a height of about 2 nm. The QDs have a truncated pyramidal form and are vertically aligned in growth direction. Photoluminescence measurements show an increase of the intensity with increasing number of stacked QD layers. Furthermore, a systematic blue-shift of 120 meV is observed with increasing number of stacked QD layers. This blueshift derives from a decrease in the QD height, because the QD height has also been the main confining dimension in our QDs.}}, author = {{Blumenthal, Sarah and Rieger, Torsten and Meertens, Doris and Pawlis, Alexander and Reuter, Dirk and As, Donat Josef}}, issn = {{0370-1972}}, journal = {{physica status solidi (b)}}, keywords = {{cubic crystals, GaN, molecular beam epitaxy, quantum dots}}, number = {{3}}, pages = {{1600729}}, title = {{{Stacked Self-Assembled Cubic GaN Quantum Dots Grown by Molecular Beam Epitaxy}}}, doi = {{https://doi.org/10.1002/pssb.201600729}}, volume = {{255}}, year = {{2018}}, } @article{39659, author = {{Vollbrecht, Joachim and Stepen, Arne and Nolkemper, Karlo and Keuker-Baumann, Susanne and Kitzerow, Heinz-Siegfried}}, issn = {{1811-2382}}, journal = {{Polymer Science, Series C}}, keywords = {{Materials Chemistry, Polymers and Plastics, General Chemistry}}, number = {{1}}, pages = {{48--54}}, publisher = {{Pleiades Publishing Ltd}}, title = {{{Blends of Two Perylene Derivatives: Mesogenic Properties and Application As Emitter Materials in OLEDs}}}, doi = {{10.1134/s1811238218010095}}, volume = {{60}}, year = {{2018}}, } @article{3427, abstract = {{We report on the coherent phase manipulation of quantum dot excitons by electric means. For our experiments, we use a low capacitance single quantum dot photodiode which is electrically controlled by a custom designed SiGe:C BiCMOS chip. The phase manipulation is performed and quantified in a Ramsey experiment, where ultrafast transient detuning of the exciton energy is performed synchronous to double pulse p/2 ps laser excitation. We are able to demonstrate electrically controlled phase manipulations with magnitudes up to 3p within 100 ps which is below the dephasing time of the quantum dot exciton.}}, author = {{Widhalm, Alex and Mukherjee, Amlan and Krehs, Sebastian and Sharma, Nandlal and Kölling, Peter and Thiede, Andreas and Reuter, Dirk and Förstner, Jens and Zrenner, Artur}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, keywords = {{tet_topic_qd}}, number = {{11}}, pages = {{111105}}, title = {{{Ultrafast electric phase control of a single exciton qubit}}}, doi = {{10.1063/1.5020364}}, volume = {{112}}, year = {{2018}}, } @inproceedings{40388, author = {{Luo, Kai Hong and Brauner, Sebastian and Eigner, Christof and Sharapova, Polina and Ricken, Raimund and Meier, Torsten and Herrmann, Harald and Silberhorn, Christine}}, booktitle = {{Conference on Lasers and Electro-Optics}}, isbn = {{978-1-943580-42-2}}, location = {{San Jose, California United States}}, publisher = {{OSA}}, title = {{{Monolithically Integrated Hong-Ou-Mandel Experiment in LiNbO3}}}, doi = {{10.1364/cleo_qels.2018.fm1g.3}}, year = {{2018}}, } @inbook{43193, abstract = {{Short laser pulses are able to generate material excitations with a well-defined phase which is imposed by the optical excitation source. The generated coherent superposition state be described as an optical polarization which exists only in non-equilibrium situations. The coherence, i.e., the phase relations between the optical transitions that originate from the excitation, leads to several interesting effects in time-resolved linear and nonlinear optical spectroscopy. In this article, the basic principles that underlie these coherent transients are introduced and several examples are presented.}}, author = {{Meier, Torsten and Koch, S.W.}}, booktitle = {{Encyclopedia of Modern Optics (Second Edition)}}, editor = {{Guenther, Bob and Steel, Duncan}}, pages = {{264--277}}, publisher = {{Elsevier}}, title = {{{Foundations of Coherent Transients in Semiconductors}}}, doi = {{10.1016/B978-0-12-803581-8.09564-3}}, volume = {{4}}, year = {{2018}}, } @article{4370, author = {{Schmidt, C. and Bühler, J. and Heinrich, A.-C. and Allerbeck, J. and Podzimski, R. and Berghoff, D. and Meier, Torsten and Schmidt, Wolf Gero and Reichl, C. and Wegscheider, W. and Brida, D. and Leitenstorfer, A.}}, issn = {{2041-1723}}, journal = {{Nature Communications}}, number = {{1}}, publisher = {{Springer Nature}}, title = {{{Signatures of transient Wannier-Stark localization in bulk gallium arsenide}}}, doi = {{10.1038/s41467-018-05229-x}}, volume = {{9}}, year = {{2018}}, } @article{10018, author = {{Schmidt, Claudia and Bühler, J. and Heinrich, A.-C. and Allerbeck, J. and Podzimski, R. and Berghoff, Daniel and Meier, Torsten and Schmidt, Wolf Gero and Reichl, C. and Wegscheider, W. and Brida, D. and Leitenstorfer, A.}}, issn = {{2041-1723}}, journal = {{Nature Communications}}, title = {{{Signatures of transient Wannier-Stark localization in bulk gallium arsenide}}}, doi = {{10.1038/s41467-018-05229-x}}, volume = {{9}}, year = {{2018}}, } @article{4369, author = {{Geiger, Zachary A. and Fujiwara, Kurt M. and Singh, Kevin and Senaratne, Ruwan and Rajagopal, Shankari V. and Lipatov, Mikhail and Shimasaki, Toshihiko and Driben, Rodislav and Konotop, Vladimir V. and Meier, Torsten and Weld, David M.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, number = {{21}}, publisher = {{American Physical Society (APS)}}, title = {{{Observation and Uses of Position-Space Bloch Oscillations in an Ultracold Gas}}}, doi = {{10.1103/physrevlett.120.213201}}, volume = {{120}}, year = {{2018}}, } @article{13286, author = {{Geiger, Zachary A. and Fujiwara, Kurt M. and Singh, Kevin and Senaratne, Ruwan and Rajagopal, Shankari V. and Lipatov, Mikhail and Shimasaki, Toshihiko and Driben, Rodislav and Konotop, Vladimir V. and Meier, Torsten and Weld, David M.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, number = {{21}}, title = {{{Observation and Uses of Position-Space Bloch Oscillations in an Ultracold Gas}}}, doi = {{10.1103/physrevlett.120.213201}}, volume = {{120}}, year = {{2018}}, } @article{13287, author = {{Driben, R. and Konotop, V. V. and Malomed, B. A. and Meier, Torsten and Yulin, A. V.}}, issn = {{2470-0045}}, journal = {{Physical Review E}}, number = {{6}}, title = {{{Nonlinearity-induced localization in a periodically driven semidiscrete system}}}, doi = {{10.1103/physreve.97.062210}}, volume = {{97}}, year = {{2018}}, } @inproceedings{13901, author = {{Akimov, Ilya and Poltavtsev, Sergey V. and Salewski, Matthias and Yugova, Irina A. and Karczewski, Grzegorz and Wojtowicz, Tomasz and Maciej, Wiater and Reichelt, Matthias and Meier, Torsten and Yakovlev, Dmitri and Bayer, Manfred}}, booktitle = {{Ultrafast Phenomena and Nanophotonics XXII}}, editor = {{Betz, Markus and Elezzabi, Abdulhakem Y.}}, isbn = {{9781510615458}}, publisher = {{SPIE}}, title = {{{Coherent optical spectroscopy of charged exciton complexes in semiconductor nanostructures}}}, doi = {{10.1117/12.2288788}}, volume = {{10530}}, year = {{2018}}, } @inproceedings{4366, author = {{Akimov, Ilya and Poltavtsev, Sergey V. and Salewski, Matthias and Yugova, Irina A. and Karczewski, Grzegorz and Wojtowicz, Tomasz and Maciej , Wiater and Reichelt, Matthias and Meier, Torsten and Yakovlev, Dmitri and Bayer, Manfred}}, booktitle = {{Ultrafast Phenomena and Nanophotonics XXII}}, editor = {{Betz, Markus and Elezzabi, Abdulhakem Y.}}, isbn = {{9781510615458}}, publisher = {{SPIE}}, title = {{{Coherent optical spectroscopy of charged exciton complexes in semiconductor nanostructures}}}, doi = {{10.1117/12.2288788}}, volume = {{10530}}, year = {{2018}}, } @article{4368, author = {{Driben, R. and Konotop, V. V. and Malomed, B. A. and Meier, Torsten and Yulin, A. V.}}, issn = {{2470-0045}}, journal = {{Physical Review E}}, number = {{6}}, publisher = {{American Physical Society (APS)}}, title = {{{Nonlinearity-induced localization in a periodically driven semidiscrete system}}}, doi = {{10.1103/physreve.97.062210}}, volume = {{97}}, year = {{2018}}, } @inproceedings{24187, abstract = {{In this paper, we present a monolithically integrated coherent receiver with on-chip grating couplers, 90° hybrid, photodiodes and transimpedance amplifiers. A transimpedance gain of 7.7 kΩ was achieved by the amplifiers. An opto-electrical 3 dB bandwidth of 34 GHz for in-phase and quadrature channel was measured. A real-time data transmission of 64 GBd-QPSK (128 Gb/s) for a single polarization was performed.}}, author = {{Gudyriev, Sergiy and Kress, Christian and Zwickel, Heiner and Kemal, Juned N. and Lischke, Stefan and Zimmermann, Lars and Koos, Christian and Scheytt, Christoph}}, booktitle = {{IEEE/OSA Journal of Lightwave Technology}}, pages = {{1--1}}, title = {{{Coherent ePIC Receiver for 64 GBaud QPSK in 0.25μm Photonic BiCMOS Technology}}}, doi = {{10.1109/JLT.2018.2881107}}, year = {{2018}}, } @article{4343, author = {{Li, Guixin and Sartorello, Giovanni and Chen, Shumei and Nicholls, Luke H. and Li, King Fai and Zentgraf, Thomas and Zhang, Shuang and Zayats, Anatoly V.}}, issn = {{1863-8880}}, journal = {{Laser & Photonics Reviews}}, number = {{6}}, publisher = {{Wiley}}, title = {{{Spin and Geometric Phase Control Four-Wave Mixing from Metasurfaces}}}, doi = {{10.1002/lpor.201800034}}, volume = {{12}}, year = {{2018}}, }