@article{4831, abstract = {{Polarization of light is essential for some living organisms and many optical applications. Here, an orientation dependent polarization conversion effect is reported for light reflected from diamond‐structure‐based photonic crystals (D‐structure) inside the scales of a beetle, the weevil Entimus imperialis. When linearly polarized light propagates along its 〈100〉 directions, the D‐structure behaves analogous to a half‐wave plate in reflection but based on a different mechanism. The D‐structure rotates the polarization direction of linearly polarized light, and reflects circularly polarized light of both handednesses without changing it. This polarization effect is different from circular dichroism occurring in chiral biological photonic structures discovered before. The structural origin of this effect is symmetry breaking inside D‐structure's unit cell. This finding demonstrates that natural photonic structures can exploit multiple functionalities inherent to the design principles of their structural organization. Aiming at transferring the inherent polarization effect of the biological D‐structure to technically realizable materials, three simplified biomimetic structural models are derived and it is theoretically demonstrated that they retain the effect. Out of these structures, functioning woodpile structure prototypes are fabricated.}}, author = {{Wu, Xia and Rodríguez-Gallegos, Fernando L. and Heep, Marie-Christin and Schwind, Bertram and Li, Guixin and Fabritius, Helge-Otto and von Freymann, Georg and Förstner, Jens}}, issn = {{2195-1071}}, journal = {{Advanced Optical Materials}}, keywords = {{tet_topic_phc, tet_topic_bio}}, number = {{24}}, pages = {{1800635}}, publisher = {{Wiley}}, title = {{{Polarization Conversion Effect in Biological and Synthetic Photonic Diamond Structures}}}, doi = {{10.1002/adom.201800635}}, volume = {{6}}, year = {{2018}}, } @article{4165, abstract = {{Metal nanoparticles host localized plasmon excitations that allow the manipulation of optical fields at the nanoscale. Despite the availability of several techniques for imaging plasmons, direct access into the symmetries of these excitations remains elusive, thus hindering progress in the development of applications. Here, we present a combination of angle-, polarization-, and space-resolved cathodoluminescence spectroscopy methods to selectively access the symmetry and degeneracy of plasmonic states in lithographically fabricated gold nanoprisms. We experimentally reveal and spatially map degenerate states of multipole plasmon modes with nanometer spatial resolution and further provide recipes for resolving optically dark and out-of-plane modes. Full-wave simulations in conjunction with a simple tight-binding model explain the complex plasmon structure in these particles and reveal intriguing mode-symmetry phenomena. Our approach introduces systematics for a comprehensive symmetry characterization of plasmonic states in high-symmetry nanostructures.}}, author = {{Myroshnychenko, Viktor and Nishio, Natsuki and García de Abajo, F. Javier and Förstner, Jens and Yamamoto, Naoki}}, issn = {{1936-0851}}, journal = {{ACS Nano}}, keywords = {{tet_topic_plasmonics}}, number = {{8}}, pages = {{8436--8446}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution}}}, doi = {{10.1021/acsnano.8b03926}}, volume = {{12}}, year = {{2018}}, } @article{4342, author = {{Chen, Shumei and Rahmani, Mohsen and Li, King Fai and Miroshnichenko, Andrey and Zentgraf, Thomas and Li, Guixin and Neshev, Dragomir and Zhang, Shuang}}, issn = {{2330-4022}}, journal = {{ACS Photonics}}, number = {{5}}, pages = {{1671--1675}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Third Harmonic Generation Enhanced by Multipolar Interference in Complementary Silicon Metasurfaces}}}, doi = {{10.1021/acsphotonics.7b01423}}, volume = {{5}}, year = {{2018}}, } @article{1430, author = {{Hoffmann, Sandro P. and Albert, Maximilian and Weber, Nils and Sievers, Denis and Förstner, Jens and Zentgraf, Thomas and Meier, Cedrik}}, issn = {{2330-4022}}, journal = {{ACS Photonics}}, keywords = {{tet_topic_phc}}, pages = {{1933--1942}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Tailored UV Emission by Nonlinear IR Excitation from ZnO Photonic Crystal Nanocavities}}}, doi = {{10.1021/acsphotonics.7b01228}}, volume = {{5}}, year = {{2018}}, } @article{1327, author = {{Weber, N. and Hoffmann, S. P. and Albert, M. and Zentgraf, Thomas and Meier, Cedrik}}, issn = {{0021-8979}}, journal = {{Journal of Applied Physics}}, number = {{10}}, publisher = {{AIP Publishing}}, title = {{{Efficient frequency conversion by combined photonic–plasmonic mode coupling}}}, doi = {{10.1063/1.5017010}}, volume = {{123}}, year = {{2018}}, } @article{10013, abstract = {{Ultrafast nonequilibrium dynamics offer a route to study the microscopic interactions that govern macroscopic behavior. In particular, photoinduced phase transitions (PIPTs) in solids provide a test case for how forces, and the resulting atomic motion along a reaction coordinate, originate from a nonequilibrium population of excited electronic states. Using femtosecond photoemission, we obtain access to the transient electronic structure during an ultrafast PIPT in a model system: indium nanowires on a silicon(111) surface. We uncover a detailed reaction pathway, allowing a direct comparison with the dynamics predicted by ab initio simulations. This further reveals the crucial role played by localized photoholes in shaping the potential energy landscape and enables a combined momentum- and real-space description of PIPTs, including the ultrafast formation of chemical bonds.}}, author = {{Nicholson, C. W. and Lücke, A. and Schmidt, Wolf Gero and Puppin, M. and Rettig, L. and Ernstorfer, R. and Wolf, M.}}, issn = {{0036-8075}}, journal = {{Science}}, pages = {{821--825}}, title = {{{Beyond the molecular movie: Dynamics of bands and bonds during a photoinduced phase transition}}}, doi = {{10.1126/science.aar4183}}, year = {{2018}}, } @article{10016, author = {{Paszkiewicz, Mateusz and Biktagirov, Timur and Aldahhak, Hazem and Allegretti, Francesco and Rauls, Eva and Schöfberger, Wolfgang and Schmidt, Wolf Gero and Barth, Johannes V. and Gerstmann, Uwe and Klappenberger, Florian}}, issn = {{1948-7185}}, journal = {{The Journal of Physical Chemistry Letters}}, pages = {{6412--6420}}, title = {{{Unraveling the Oxidation and Spin State of Mn–Corrole through X-ray Spectroscopy and Quantum Chemical Analysis}}}, doi = {{10.1021/acs.jpclett.8b02525}}, year = {{2018}}, } @article{10019, author = {{Aldahhak, Hazem and Paszkiewicz, M. and Rauls, E. and Allegretti, F. and Tebi, S. and Papageorgiou, A. C. and Zhang, Y.-Q. and Zhang, L. and Lin, T. and Paintner, T. and Koch, R. and Schmidt, Wolf Gero and Barth, J. V. and Schöfberger, W. and Müllegger, S. and Klappenberger, F. and Gerstmann, Uwe}}, issn = {{0947-6539}}, journal = {{Chemistry - A European Journal}}, pages = {{6787--6797}}, title = {{{Identifying On-Surface Site-Selective Chemical Conversions by Theory-Aided NEXAFS Spectroscopy: The Case of Free-Base Corroles on Ag(111)}}}, doi = {{10.1002/chem.201705921}}, 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{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}}, } @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{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}}, } @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}}, } @article{4357, author = {{Chen, Shumei and Li, Guixin and Cheah, Kok Wai and Zentgraf, Thomas and Zhang, Shuang}}, issn = {{2192-8614}}, journal = {{Nanophotonics}}, number = {{6}}, pages = {{1013--1024}}, publisher = {{Walter de Gruyter GmbH}}, title = {{{Controlling the phase of optical nonlinearity with plasmonic metasurfaces}}}, doi = {{10.1515/nanoph-2018-0011}}, volume = {{7}}, year = {{2018}}, } @article{1197, author = {{Schlickriede, Christian and Waterman, Naomi and Reineke, Bernhard and Georgi, Philip and Li, Guixin and Zhang, Shuang and Zentgraf, Thomas}}, issn = {{0935-9648}}, journal = {{Advanced Materials}}, number = {{8}}, publisher = {{Wiley-Blackwell}}, title = {{{Imaging through Nonlinear Metalens Using Second Harmonic Generation}}}, doi = {{10.1002/adma.201703843}}, volume = {{30}}, year = {{2018}}, }