@article{22053,
  author       = {{Spychala, K. J. and Mackwitz, P. and Widhalm, A. and Berth, G. and Zrenner, A.}},
  issn         = {{0021-8979}},
  journal      = {{Journal of Applied Physics}},
  title        = {{{Spatially resolved light field analysis of the second-harmonic signal of χ(2)-materials in the tight focusing regime}}},
  doi          = {{10.1063/1.5133476}},
  year         = {{2020}},
}

@article{22054,
  author       = {{Spychala, K. J. and Mackwitz, P. and Widhalm, A. and Berth, Gerhard and Zrenner, Artur}},
  issn         = {{0021-8979}},
  journal      = {{Journal of Applied Physics}},
  title        = {{{Spatially resolved light field analysis of the second-harmonic signal of χ(2)-materials in the tight focusing regime}}},
  doi          = {{10.1063/1.5133476}},
  year         = {{2020}},
}

@article{16839,
  author       = {{Sain, Basudeb and Zentgraf, Thomas}},
  issn         = {{2047-7538}},
  journal      = {{Light: Science & Applications}},
  pages        = {{67}},
  title        = {{{Metasurfaces help lasers to mode-lock}}},
  doi          = {{10.1038/s41377-020-0312-1}},
  volume       = {{9}},
  year         = {{2020}},
}

@article{16931,
  author       = {{Zhou, Hongqiang and Sain, Basudeb and Wang, Yongtian and Schlickriede, Christian and Zhao, Ruizhe and Zhang, Xue and Wei, Qunshuo and Li, Xiaowei and Huang, Lingling and Zentgraf, Thomas}},
  issn         = {{1936-0851}},
  journal      = {{ACS Nano}},
  number       = {{5}},
  pages        = {{5553–5559}},
  title        = {{{Polarization-Encrypted Orbital Angular Momentum Multiplexed Metasurface Holography}}},
  doi          = {{10.1021/acsnano.9b09814}},
  volume       = {{14}},
  year         = {{2020}},
}

@article{16944,
  author       = {{Schlickriede, Christian and Kruk, Sergey S. and Wang, Lei and Sain, Basudeb and Kivshar, Yuri and Zentgraf, Thomas}},
  issn         = {{1530-6984}},
  journal      = {{Nano Letters}},
  number       = {{6}},
  pages        = {{4370–4376}},
  title        = {{{Nonlinear imaging with all-dielectric metasurfaces}}},
  doi          = {{10.1021/acs.nanolett.0c01105}},
  volume       = {{20}},
  year         = {{2020}},
}

@article{15480,
  abstract     = {{<jats:p>The nonlinear processes of frequency conversion such as second harmonic generation (SHG) usually obey certain selection rules, resulting from the preservation of different kinds of physical quantities, e.g. the angular momentum. For the SHG created by a monolayer of transition-metal dichalcogenides (TMDCs) such as WS<jats:sub>2</jats:sub>, the valley-exciton locked selection rule predicts an SHG signal in the cross-polarization state. By combining plasmonic nanostructures with a monolayer of TMDC, a hybrid metasurface is realized, which affects this nonlinear process because of an additional polarization conversion process. Here, we observe that the plasmonic metasurface modifies the light-matter interaction with the TMDC, resulting in an SHG signal that is co-polarized with respect to the incident field, which is usually forbidden for the monolayers of TMDC. We fabricate such hybrid metasurfaces by placing plasmonic nanorods on top of a monolayer WS<jats:sub>2</jats:sub> and study the valley-exciton locked SHG emission from such system for different parameters, such as wavelength and polarization. Furthermore, we show the potential of the hybrid metasurface for tailoring nonlinear processes by adding additional phase information to the SHG signal using the Pancharatnam-Berry phase effect. This allows direct tailoring of the SHG emission to the far-field.</jats:p>}},
  author       = {{Spreyer, Florian and Zhao, Ruizhe and Huang, Lingling and Zentgraf, Thomas}},
  issn         = {{2192-8614}},
  journal      = {{Nanophotonics}},
  number       = {{2}},
  pages        = {{351–360}},
  title        = {{{Second harmonic imaging of plasmonic Pancharatnam-Berry phase metasurfaces coupled to monolayers of WS2}}},
  doi          = {{10.1515/nanoph-2019-0378}},
  volume       = {{9}},
  year         = {{2020}},
}

@article{15714,
  author       = {{Riedl, T. and Kunnathully, V. S. and Trapp, A. and Langer, T. and Reuter, D. and Lindner, J. K. N.}},
  issn         = {{2475-9953}},
  journal      = {{Physical Review Materials}},
  title        = {{{Strain-driven InAs island growth on top of GaAs(111) nanopillars}}},
  doi          = {{10.1103/physrevmaterials.4.014602}},
  year         = {{2020}},
}

@article{16197,
  abstract     = {{Nonlinear Pancharatnam–Berry phase metasurfaces facilitate the nontrivial phase modulation for frequency conversion processes by leveraging photon‐spin dependent nonlinear geometric‐phases. However, plasmonic metasurfaces show some severe limitation for nonlinear frequency conversion due to the intrinsic high ohmic loss and low damage threshold of plasmonic nanostructures. Here, the nonlinear geometric‐phases associated with the third‐harmonic generation process occurring in all‐dielectric metasurfaces is studied systematically, which are composed of silicon nanofins with different in‐plane rotational symmetries. It is found that the wave coupling among different field components of the resonant fundamental field gives rise to the appearance of different nonlinear geometric‐phases of the generated third‐harmonic signals. The experimental observations of the nonlinear beam steering and nonlinear holography realized in this work by all‐dielectric geometric‐phase metasurfaces are well explained with the developed theory. This work offers a new physical picture to understand the nonlinear optical process occurring at nanoscale dielectric resonators and will help in the design of nonlinear metasurfaces with tailored phase properties.}},
  author       = {{Liu, Bingyi and Sain, Basudeb and Reineke, Bernhard and Zhao, Ruizhe and Meier, Cedrik and Huang, Lingling and Jiang, Yongyuan and Zentgraf, Thomas}},
  issn         = {{2195-1071}},
  journal      = {{Advanced Optical Materials}},
  number       = {{9}},
  publisher    = {{Wiley}},
  title        = {{{Nonlinear Wavefront Control by Geometric-Phase Dielectric Metasurfaces: Influence of Mode Field and Rotational Symmetry}}},
  doi          = {{10.1002/adom.201902050}},
  volume       = {{8}},
  year         = {{2020}},
}

@article{29526,
  author       = {{van der Meer, R. and Renema, J. J. and Brecht, Benjamin and Silberhorn, Christine and Pinkse, P. W. H.}},
  issn         = {{2469-9926}},
  journal      = {{Physical Review A}},
  number       = {{6}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Optimizing spontaneous parametric down-conversion sources for boson sampling}}},
  doi          = {{10.1103/physreva.101.063821}},
  volume       = {{101}},
  year         = {{2020}},
}

@article{20157,
  author       = {{Thiele, Frederik and vom Bruch, Felix and Quiring, Victor and Ricken, Raimund and Herrmann, Harald and Eigner, Christof and Silberhorn, Christine and Bartley, Tim}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  title        = {{{Cryogenic electro-optic polarisation conversion in titanium in-diffused lithium niobate waveguides}}},
  doi          = {{10.1364/oe.399818}},
  year         = {{2020}},
}

@inproceedings{21719,
  abstract     = {{We fabricate silicon tapers to increase the mode overlap of superconducting detectors on Ti:LiNbO3 waveguides. Mode images show a reduction in mode size from 6 µm to 2 µm FWHM, agreeing with beam propagation simulations.}},
  author       = {{Protte, Maximilian and Ebers, Lena and Hammer, Manfred and Höpker, Jan Philipp and Albert, Maximilian and Quiring, Viktor and Meier, Cedrik and Förstner, Jens and Silberhorn, Christine and Bartley, Tim}},
  booktitle    = {{OSA Quantum 2.0 Conference}},
  isbn         = {{9781943580811}},
  keywords     = {{tet_topic_waveguide}},
  title        = {{{Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics}}},
  doi          = {{10.1364/quantum.2020.qth7a.8}},
  year         = {{2020}},
}

@article{35527,
  author       = {{Breuer, Judith and Vogelsang, Christoph and Reinhold, Peter}},
  journal      = {{PhyDid A - Physik und Didaktik in Schule und Hochschule}},
  title        = {{{Implementation und Nutzung von Unterrichtsmaterialien im schulischen Unterricht – Eine Bestandsaufnahme der mathematisch-naturwissenschaftlichen Fächer}}},
  year         = {{2020}},
}

@inbook{35654,
  author       = {{Huwer, Johannes and Thyssen, Christoph and Vogelsang, Christoph}},
  booktitle    = {{Digitale Innovationen und Kompetenzen in der Lehramtsausbildung}},
  editor       = {{Gryl, Inga and Schacht, Florian and Beißwenger, Michael and Bullzek, Björn}},
  pages        = {{353--367}},
  publisher    = {{Universitätsverlag Rhein-Ruhr}},
  title        = {{{Lehre:digital – Erwerb digitaler Lehrkompetenz im fächerübergreifenden Kontext Chemie, Biologie und Physik}}},
  year         = {{2020}},
}

@article{34092,
  abstract     = {{<jats:p>Block copolymer (BCP) self-assembly is a promising tool for next generation lithography as microphase separated polymer domains in thin films can act as templates for surface nanopatterning with sub-20 nm features. The replicated patterns can, however, only be as precise as their templates. Thus, the investigation of the morphology of polymer domains is of great importance. Commonly used analytical techniques (neutron scattering, scanning force microscopy) either lack spatial information or nanoscale resolution. Using advanced analytical (scanning) transmission electron microscopy ((S)TEM), we provide real space information on polymer domain morphology and interfaces between polystyrene (PS) and polymethylmethacrylate (PMMA) in cylinder- and lamellae-forming BCPs at highest resolution. This allows us to correlate the internal structure of polymer domains with line edge roughnesses, interface widths and domain sizes. STEM is employed for high-resolution imaging, electron energy loss spectroscopy and energy filtered TEM (EFTEM) spectroscopic imaging for material identification and EFTEM thickness mapping for visualisation of material densities at defects. The volume fraction of non-phase separated polymer species can be analysed by EFTEM. These methods give new insights into the morphology of polymer domains the exact knowledge of which will allow to improve pattern quality for nanolithography.</jats:p>}},
  author       = {{Bürger, Julius and Kunnathully, Vinay and Kool, Daniel and Lindner, Jörg and Brassat, Katharina}},
  issn         = {{2079-4991}},
  journal      = {{Nanomaterials}},
  keywords     = {{General Materials Science, General Chemical Engineering}},
  number       = {{1}},
  publisher    = {{MDPI AG}},
  title        = {{{Characterisation of the PS-PMMA Interfaces in Microphase Separated Block Copolymer Thin Films by Analytical (S)TEM}}},
  doi          = {{10.3390/nano10010141}},
  volume       = {{10}},
  year         = {{2020}},
}

@article{34093,
  author       = {{Riedl, Thomas and Kunnathully, V. S. and Trapp, A. and Langer, T. and Reuter, Dirk and Lindner, Jörg}},
  issn         = {{2475-9953}},
  journal      = {{Physical Review Materials}},
  keywords     = {{Physics and Astronomy (miscellaneous), General Materials Science}},
  number       = {{1}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Strain-driven InAs island growth on top of GaAs(111) nanopillars}}},
  doi          = {{10.1103/physrevmaterials.4.014602}},
  volume       = {{4}},
  year         = {{2020}},
}

@article{34088,
  author       = {{Bürger, Julius and Riedl, Thomas and Lindner, Jörg}},
  issn         = {{0304-3991}},
  journal      = {{Ultramicroscopy}},
  keywords     = {{Instrumentation, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials}},
  publisher    = {{Elsevier BV}},
  title        = {{{Influence of lens aberrations, specimen thickness and tilt on differential phase contrast STEM images}}},
  doi          = {{10.1016/j.ultramic.2020.113118}},
  volume       = {{219}},
  year         = {{2020}},
}

@article{34091,
  author       = {{Kunnathully, Vinay S. and Riedl, Thomas and Trapp, Alexander and Langer, Timo and Reuter, Dirk and Lindner, Jörg}},
  issn         = {{0022-0248}},
  journal      = {{Journal of Crystal Growth}},
  keywords     = {{Materials Chemistry, Inorganic Chemistry, Condensed Matter Physics}},
  publisher    = {{Elsevier BV}},
  title        = {{{InAs heteroepitaxy on nanopillar-patterned GaAs (111)A}}},
  doi          = {{10.1016/j.jcrysgro.2020.125597}},
  volume       = {{537}},
  year         = {{2020}},
}

@article{34090,
  author       = {{Riedl, Thomas and Lindner, Jörg}},
  issn         = {{0038-1098}},
  journal      = {{Solid State Communications}},
  keywords     = {{Materials Chemistry, Condensed Matter Physics, General Chemistry}},
  publisher    = {{Elsevier BV}},
  title        = {{{Applicability of molecular statics simulation to partial dislocations in GaAs}}},
  doi          = {{10.1016/j.ssc.2020.113927}},
  volume       = {{314-315}},
  year         = {{2020}},
}

@article{34089,
  author       = {{Riedl, Thomas and Lindner, Jörg}},
  issn         = {{0038-1098}},
  journal      = {{Solid State Communications}},
  keywords     = {{Materials Chemistry, Condensed Matter Physics, General Chemistry}},
  publisher    = {{Elsevier BV}},
  title        = {{{Applicability of molecular statics simulation to partial dislocations in GaAs}}},
  doi          = {{10.1016/j.ssc.2020.113927}},
  volume       = {{314-315}},
  year         = {{2020}},
}

@article{16301,
  author       = {{Atorf, Bernhard and Mühlenbernd, Holger and Zentgraf, Thomas and Kitzerow, Heinz-Siegfried}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  number       = {{6}},
  pages        = {{8898--8908}},
  title        = {{{All-optical switching of a dye-doped liquid crystal plasmonic metasurface}}},
  doi          = {{10.1364/oe.383877}},
  volume       = {{28}},
  year         = {{2020}},
}