@article{40433,
  author       = {{Dong, Chuan-Ding and Schumacher, Stefan}},
  issn         = {{1932-7447}},
  journal      = {{The Journal of Physical Chemistry C}},
  keywords     = {{Surfaces, Coatings and Films, Physical and Theoretical Chemistry, General Energy, Electronic, Optical and Magnetic Materials}},
  number       = {{40}},
  pages        = {{21824--21830}},
  publisher    = {{American Chemical Society (ACS)}},
  title        = {{{Microscopic Insights into Charge Formation and Energetics in n-Doped Organic Semiconductors}}},
  doi          = {{10.1021/acs.jpcc.1c05666}},
  volume       = {{125}},
  year         = {{2021}},
}

@article{40379,
  author       = {{Sukharnikov, Vladislav and Sharapova, Polina and Tikhonova, Olga}},
  issn         = {{0030-3992}},
  journal      = {{Optics & Laser Technology}},
  keywords     = {{Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials}},
  publisher    = {{Elsevier BV}},
  title        = {{{Managing spectral properties and Schmidt mode content of squeezed vacuum light using sum-frequency converter}}},
  doi          = {{10.1016/j.optlastec.2020.106769}},
  volume       = {{136}},
  year         = {{2021}},
}

@article{23727,
  author       = {{Schapeler, Timon and Höpker, Jan Philipp and Bartley, Tim}},
  issn         = {{0953-2048}},
  journal      = {{Superconductor Science and Technology}},
  title        = {{{Quantum detector tomography of a high dynamic-range superconducting nanowire single-photon detector}}},
  doi          = {{10.1088/1361-6668/abee9a}},
  year         = {{2021}},
}

@inproceedings{63045,
  abstract     = {{<jats:p>We present the ultra-high bandwidth plasmonics platform that enables efficient electro-optic modulation at micrometer scale. Applications in optical communications are discussed.</jats:p>}},
  author       = {{Hoessbacher, Claudia and Baeuerle, Benedikt and De Leo, Eva and Medico, Nino Del and Duran, Hamit and Güsken, Nicholas Alexander and Habegger, Patrick and Heni, Wolfgang and Meier, Norbert}},
  booktitle    = {{Conference on Lasers and Electro-Optics}},
  publisher    = {{Optica Publishing Group}},
  title        = {{{Progress and Challenges of Plasmonics for Efficient and High-Speed Optical Communications}}},
  doi          = {{10.1364/cleo_si.2021.stu2b.6}},
  year         = {{2021}},
}

@article{21475,
  author       = {{Frese, Daniel and Wei, Qunshuo and Wang, Yongtian and Cinchetti, Mirko and Huang, Lingling and Zentgraf, Thomas}},
  issn         = {{2330-4022}},
  journal      = {{ACS Photonics}},
  number       = {{4}},
  pages        = {{1013--1019}},
  title        = {{{Nonlinear Bicolor Holography Using Plasmonic Metasurfaces}}},
  doi          = {{10.1021/acsphotonics.1c00028}},
  volume       = {{8}},
  year         = {{2021}},
}

@article{23991,
  author       = {{Kruse, Stephan and Gudyriev, Sergiy and Kneuper, Pascal and Schwabe, Tobias and Kurz, Heiko G. and Scheytt, Christoph}},
  journal      = {{IEEE Microwave and Wireless Components Letters}},
  number       = {{6}},
  pages        = {{783--786}},
  title        = {{{Silicon Photonic Radar Transmitter IC for mm-Wave Large Aperture MIMO Radar Using Optical Clock Distribution}}},
  doi          = {{10.1109/LMWC.2021.3062112}},
  volume       = {{31}},
  year         = {{2021}},
}

@inproceedings{23995,
  author       = {{Kruse, Stephan and Bahmanian, Meysam and Kneuper, Pascal and Kress, Christian and Kurz, Heiko G. and Schneider, Thomas and Scheytt, Christoph}},
  booktitle    = {{The 17th European Radar Conference}},
  title        = {{{Phase Noise Investigation for a Radar System with Optical Clock Distribution }}},
  doi          = {{10.1109/EuRAD48048.2021.00018}},
  year         = {{2021}},
}

@inproceedings{29205,
  abstract     = {{We present the optical generation of a 300 Gbaud PRBS-7 data signal based on time-division multiplexing of Nyquist sinc-pulse sequences. The employed electronic and photonic components need only one-third of the final bandwidth.}},
  author       = {{Singh, Karanveer and Meier, Janosch and Preussler, Stefan and Kress, Christian and Scheytt, J. Christoph and Schneider, Thomas}},
  booktitle    = {{OSA Advanced Photonics Congress 2021}},
  isbn         = {{978-1-943580-94-1}},
  location     = {{Washington, DC United States}},
  pages        = {{SpTu4D.6}},
  publisher    = {{Optical Society of America}},
  title        = {{{Optical PRBS Generation with Threefold Bandwidth of the Employed Electronics and Photonics}}},
  doi          = {{https://doi.org/10.1364/SPPCOM.2021.SpTu4D.6}},
  year         = {{2021}},
}

@article{29202,
  author       = {{De, Souvaraj and Singh, Karanveer and Kress, Christian and Das, Ranjan and Schwabe, Tobias and Preußler, Stefan and Kleine-Ostmann, Thomas and Scheytt, J. Christoph and Schneider, Thomas}},
  journal      = {{IEEE Photonics Technology Letters}},
  number       = {{21}},
  pages        = {{1189--1192}},
  title        = {{{Roll-Off Factor Analysis of Optical Nyquist Pulses Generated by an On-Chip Mach-Zehnder Modulator}}},
  doi          = {{10.1109/LPT.2021.3112485}},
  volume       = {{33}},
  year         = {{2021}},
}

@article{20189,
  abstract     = {{A dielectric step-index optical fiber with tube-like profile is considered, being positioned with a small gap on top of a dielectric slab waveguide. We propose a 2.5-D hybrid analytical/numerical coupled mode model for the evanescent excitation of the tube through semi-guided waves propagating in the slab at oblique angles. The model combines the directional polarized modes supported by the slab with analytic solutions for the TE-, TM-, and orbital-angular-momentum (OAM) modes of the tube-shaped fiber. Implementational details of the scheme are discussed, complemented by finite-element simulations for verification purposes. Our results include configurations with resonant in-fiber excitation of OAM modes with large orbital angular momentum and strong field enhancement.}},
  author       = {{Hammer, Manfred and Ebers, Lena and Förstner, Jens}},
  issn         = {{0306-8919}},
  journal      = {{Optical and Quantum Electronics}},
  keywords     = {{tet_topic_waveguides}},
  title        = {{{Hybrid coupled mode modelling of the evanescent excitation of a dielectric tube by semi-guided waves at oblique angles}}},
  doi          = {{10.1007/s11082-020-02595-z}},
  volume       = {{52}},
  year         = {{2020}},
}

@article{20233,
  abstract     = {{The challenge of designing new tunable nonlinear dielectric materials with tailored properties has attracted an increasing amount of interest recently. Herein, we study the effective nonlinear dielectric response of a stochastic paraelectric-dielectric composite consisting of equilibrium distributions of circular and partially penetrable disks (or parallel, infinitely long, identical, partially penetrable, circular cylinders) of a dielectric phase randomly dispersed in a continuous matrix of a paraelectric phase. The random microstructures were generated using the Metropolis Monte Carlo algorithm. The evaluation of the effective permittivity and tunability were carried out by employing either a Landau thermodynamic model or its Johnson’s approximation to describe the field-dependent permittivity of the paraelectric phase and solving continuum-electrostatics equations using finite element calculations. We reveal that the percolation threshold in this composite governs the critical behavior of the effective permittivity and tunability. For microstructures below the percolation threshold, our simulations demonstrate a strong nonlinear behaviour of the field-dependent effective permittivity and very high tunability that increases as a function of dielectric phase concentration. Above the percolation threshold, the effective permittivity shows the tendency to linearization and the tunability dramatically drops down. The highly reduced permittivity and extraordinarily high tunability are obtained for the composites with dielectric impenetrable disks at high concentrations, in which the triggering of the percolation transition is avoided. The reported results cast light on distinct nonlinear behaviour of 2D and 3D stochastic composites and can guide the design of novel composites with the controlled morphology and tailored permittivity and tunability.}},
  author       = {{Myroshnychenko, Viktor and Smirnov, Stanislav and Jose, Pious Mathews Mulavarickal and Brosseau, Christian and Förstner, Jens}},
  issn         = {{1359-6454}},
  journal      = {{Acta Materialia}},
  pages        = {{116432}},
  title        = {{{Nonlinear dielectric properties of random paraelectric-dielectric composites}}},
  doi          = {{10.1016/j.actamat.2020.10.051}},
  volume       = {{203}},
  year         = {{2020}},
}

@article{17390,
  author       = {{Chantakit, Teanchai and Schlickriede, Christian and Sain, Basudeb and Meyer, Fabian and Weiss, Thomas and Chattham, Nattaporn and Zentgraf, Thomas}},
  issn         = {{2327-9125}},
  journal      = {{Photonics Research}},
  number       = {{9}},
  pages        = {{1435--1440}},
  publisher    = {{OSA}},
  title        = {{{All-dielectric silicon metalens for two-dimensional particle manipulation in optical tweezers}}},
  doi          = {{10.1364/prj.389200}},
  volume       = {{8}},
  year         = {{2020}},
}

@article{17433,
  author       = {{Wang, D. Q. and Reuter, Dirk and Wieck, A. D. and Hamilton, A. R. and Klochan, O.}},
  issn         = {{0003-6951}},
  journal      = {{Applied Physics Letters}},
  title        = {{{Two-dimensional lateral surface superlattices in GaAs heterostructures with independent control of carrier density and modulation potential}}},
  doi          = {{10.1063/5.0009462}},
  year         = {{2020}},
}

@article{17434,
  author       = {{Kunnathully, Vinay S. and Riedl, Thomas and Trapp, Alexander and Langer, Timo and Reuter, Dirk and Lindner, Jörg K.N.}},
  issn         = {{0022-0248}},
  journal      = {{Journal of Crystal Growth}},
  title        = {{{InAs heteroepitaxy on nanopillar-patterned GaAs (111)A}}},
  doi          = {{10.1016/j.jcrysgro.2020.125597}},
  year         = {{2020}},
}

@article{17435,
  author       = {{Geier, M. and Freudenfeld, J. and Silva, J. T. and Umansky, V. and Reuter, Dirk and Wieck, A. D. and Brouwer, P. W. and Ludwig, S.}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  title        = {{{Electrostatic potential shape of gate-defined quantum point contacts}}},
  doi          = {{10.1103/physrevb.101.165429}},
  year         = {{2020}},
}

@article{17436,
  abstract     = {{<jats:p>The study of electron transport in low-dimensional systems is of importance, not only from a fundamental point of view, but also for future electronic and spintronic devices. In this context heterostructures containing a two-dimensional electron gas (2DEG) are a key technology. In particular GaAs/AlGaAs heterostructures, with a 2DEG at typically 100 nm below the surface, are widely studied. In order to explore electron transport in such systems, low-resistance ohmic contacts are required that connect the 2DEG to macroscopic measurement leads at the surface. Here we report on designing and measuring a dedicated device for unraveling the various resistance contributions in such contacts, which include pristine 2DEG series resistance, the 2DEG resistance under a contact, the contact resistance itself, and the influence of pressing a bonding wire onto a contact. We also report here a recipe for contacts with very low resistance values that remain below 10 Ω for annealing times between 20 and 350 s, hence providing the flexibility to use this method for materials with different 2DEG depths. The type of heating, temperature ramp rate and gas forming used for annealing is found to strongly influence the annealing process and hence the quality of the resulting contacts.</jats:p>}},
  author       = {{Javaid Iqbal, Muhammad and Reuter, Dirk and Wieck, Andreas Dirk and van der Wal, Caspar}},
  issn         = {{1286-0042}},
  journal      = {{The European Physical Journal Applied Physics}},
  title        = {{{Characterization of low-resistance ohmic contacts to a two-dimensional electron gas in a GaAs/AlGaAs heterostructure}}},
  doi          = {{10.1051/epjap/2020190202}},
  year         = {{2020}},
}

@article{17437,
  author       = {{Ebler, C. and Labud, P. A. and Rai, A. K. and Reuter, Dirk and Wieck, A. D. and Ludwig, A.}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  title        = {{{Electrical detection of excitonic states by time-resolved conductance measurements}}},
  doi          = {{10.1103/physrevb.101.125303}},
  year         = {{2020}},
}

@article{17523,
  abstract     = {{<jats:p>Compact and robust cold atom sources are increasingly important for quantum research, especially for transferring cutting-edge quantum science into practical applications. In this study, we report on a novel scheme that uses a metasurface optical chip to replace the conventional bulky optical elements used to produce a cold atomic ensemble with a single incident laser beam, which is split by the metasurface into multiple beams of the desired polarization states. Atom numbers ~10<jats:sup>7</jats:sup> and temperatures (about 35 μK) of relevance to quantum sensing are achieved in a compact and robust fashion. Our work highlights the substantial progress toward fully integrated cold atom quantum devices by exploiting metasurface optical chips, which may have great potential in quantum sensing, quantum computing, and other areas.</jats:p>}},
  author       = {{Zhu, Lingxiao and Liu, Xuan and Sain, Basudeb and Wang, Mengyao and Schlickriede, Christian and Tang, Yutao and Deng, Junhong and Li, Kingfai and Yang, Jun and Holynski, Michael and Zhang, Shuang and Zentgraf, Thomas and Bongs, Kai and Lien, Yu-Hung and Li, Guixin}},
  issn         = {{2375-2548}},
  journal      = {{Science Advances}},
  number       = {{31}},
  publisher    = {{American Association for the Advancement of Science}},
  title        = {{{A dielectric metasurface optical chip for the generation of cold atoms}}},
  doi          = {{10.1126/sciadv.abb6667}},
  volume       = {{6}},
  year         = {{2020}},
}

@article{17803,
  abstract     = {{We numerically simulate multiple light scattering in discrete disordered media represented by large clusters of irregular non-absorbing particles. The packing density of clusters is 0.5. With such conditions diffuse scattering is significantly reduced and light transport follows propagation channels that are determined by the particle size and topology of the medium. This kind of localization produces coherent backscattering intensity surge and enhanced negative polarization branch if compared to lower density samples.}},
  author       = {{Grynko, Yevgen and Shkuratov, Yuriy and Förstner, Jens}},
  issn         = {{0022-4073}},
  journal      = {{Journal of Quantitative Spectroscopy and Radiative Transfer}},
  keywords     = {{tet_topic_scattering}},
  pages        = {{107234}},
  title        = {{{Light backscattering from large clusters of densely packed irregular particles}}},
  doi          = {{10.1016/j.jqsrt.2020.107234}},
  volume       = {{255}},
  year         = {{2020}},
}

@article{23838,
  author       = {{Beloufa, Abbes and Bouguenna, Driss and Kermas, Nawel and As, Donat Josef}},
  issn         = {{0361-5235}},
  journal      = {{Journal of Electronic Materials}},
  pages        = {{2008--2017}},
  title        = {{{A Physics-Based Compact Static and Dynamic Characteristics Model for Al2O3/InxAl1−xN/AlN/GaN MOS-HEMTs}}},
  doi          = {{10.1007/s11664-019-07927-8}},
  year         = {{2020}},
}