@article{30743,
author = {{Riedl, Thomas and Kunnathully, Vinay S. and Trapp, Alexander and Langer, Timo and Reuter, Dirk and Lindner, Jörg K. N.}},
issn = {{2196-7350}},
journal = {{Advanced Materials Interfaces}},
keywords = {{Mechanical Engineering, Mechanics of Materials}},
publisher = {{Wiley}},
title = {{{Size‐Dependent Strain Relaxation in InAs Quantum Dots on Top of GaAs(111)A Nanopillars}}},
doi = {{10.1002/admi.202102159}},
year = {{2022}},
}
@article{30880,
author = {{Kobecki, Michal and Scherbakov, Alexey V. and Kukhtaruk, Serhii M. and Yaremkevich, Dmytro D. and Henksmeier, Tobias and Trapp, Alexander and Reuter, Dirk and Gusev, Vitalyi E. and Akimov, Andrey V. and Bayer, Manfred}},
issn = {{0031-9007}},
journal = {{Physical Review Letters}},
keywords = {{General Physics and Astronomy}},
number = {{15}},
publisher = {{American Physical Society (APS)}},
title = {{{Giant Photoelasticity of Polaritons for Detection of Coherent Phonons in a Superlattice with Quantum Sensitivity}}},
doi = {{10.1103/physrevlett.128.157401}},
volume = {{128}},
year = {{2022}},
}
@article{29902,
author = {{Reineke Matsudo, Bernhard and Sain, Basudeb and Carletti, Luca and Zhang, Xue and Gao, Wenlong and Angelis, Costantino and Huang, Lingling and Zentgraf, Thomas}},
issn = {{2198-3844}},
journal = {{Advanced Science}},
keywords = {{General Physics and Astronomy, General Engineering, Biochemistry, Genetics and Molecular Biology (miscellaneous), General Materials Science, General Chemical Engineering, Medicine (miscellaneous)}},
number = {{12}},
publisher = {{Wiley}},
title = {{{Efficient Frequency Conversion with Geometric Phase Control in Optical Metasurfaces}}},
doi = {{10.1002/advs.202104508}},
volume = {{9}},
year = {{2022}},
}
@article{30964,
author = {{Gao, Wenlong and Sain, Basudeb and Zentgraf, Thomas}},
issn = {{2331-7019}},
journal = {{Physical Review Applied}},
keywords = {{General Physics and Astronomy}},
number = {{4}},
publisher = {{American Physical Society (APS)}},
title = {{{Spin-Orbit Interaction of Light Enabled by Negative Coupling in High-Quality-Factor Optical Metasurfaces}}},
doi = {{10.1103/physrevapplied.17.044022}},
volume = {{17}},
year = {{2022}},
}
@article{32108,
author = {{Henksmeier, T. and Schulz, J.F. and Kluth, E. and Feneberg, M. and Goldhahn, R. and Sanchez, A.M. and Voigt, M. and Grundmeier, Guido and Reuter, Dirk}},
issn = {{0022-0248}},
journal = {{Journal of Crystal Growth}},
keywords = {{Materials Chemistry, Inorganic Chemistry, Condensed Matter Physics}},
publisher = {{Elsevier BV}},
title = {{{Remote epitaxy of InxGa1-xAs (0 0 1) on graphene covered GaAs(0 0 1) substrates}}},
doi = {{10.1016/j.jcrysgro.2022.126756}},
volume = {{593}},
year = {{2022}},
}
@inproceedings{34465,
author = {{laeim, Huddad and Schlickriede, Christian and Chaisakul, Papichaya and Chattham, Nattaporn and Panitchakan, Hathai and Siangchaew, Krisda and Zentgraf, Thomas and Pattanaporhratana, Apichart}},
booktitle = {{Metamaterials, Metadevices, and Metasystems 2022}},
editor = {{Engheta, Nader and Noginov, Mikhail A. and Zheludev, Nikolay I.}},
publisher = {{SPIE}},
title = {{{Design and investigation of a metalens for efficiency enhancement of laser-waveguide coupling in a limited space system}}},
doi = {{10.1117/12.2629789}},
year = {{2022}},
}
@article{31241,
author = {{Verma, A.K. and Bopp, F. and Finley, J.J. and Jonas, B. and Zrenner, A. and Reuter, Dirk}},
issn = {{0022-0248}},
journal = {{Journal of Crystal Growth}},
keywords = {{Materials Chemistry, Inorganic Chemistry, Condensed Matter Physics}},
publisher = {{Elsevier BV}},
title = {{{Low Areal Densities of InAs Quantum Dots on GaAs(100) Prepared by Molecular Beam Epitaxy}}},
doi = {{10.1016/j.jcrysgro.2022.126715}},
year = {{2022}},
}
@article{31480,
abstract = {{Optical geometric phase encoded by in-plane spatial orientation of microstructures has promoted the rapid development of numerous functional meta-devices. However, pushing the concept of the geometric phase toward the acoustic community still faces challenges. In this work, we utilize two acoustic nonlocal metagratings that could support a direct conversion between an acoustic plane wave and a designated vortex mode to obtain the acoustic geometric phase, in which an orbital angular momentum conversion process plays a vital role. In addition, we realize the acoustic geometric phases of different orders by merely varying the orientation angle of the acoustic nonlocal metagratings. Intriguingly, according to our developed theory, we reveal that the reflective acoustic geometric phase, which is twice the transmissive one, can be readily realized by transferring the transmitted configuration to a reflected one. Both the theoretical study and experimental measurements verify the announced transmissive and reflective acoustic geometric phases. Moreover, the reconfigurability and continuous phase modulation that covers the 2π range shown by the acoustic geometric phases provide us with the alternatives in advanced acoustic wavefront control.}},
author = {{Liu, Bingyi and Zhou, Zhiling and Wang, Yongtian and Zentgraf, Thomas and Li, Yong and Huang, Lingling}},
issn = {{0003-6951}},
journal = {{Applied Physics Letters}},
keywords = {{Physics and Astronomy (miscellaneous)}},
number = {{21}},
publisher = {{AIP Publishing}},
title = {{{Experimental verification of the acoustic geometric phase}}},
doi = {{10.1063/5.0091474}},
volume = {{120}},
year = {{2022}},
}
@article{31541,
author = {{Kobecki, Michal and Scherbakov, Alexey V. and Kukhtaruk, Serhii M. and Yaremkevich, Dmytro D. and Henksmeier, Tobias and Trapp, Alexander and Reuter, Dirk and Gusev, Vitalyi E. and Akimov, Andrey V. and Bayer, Manfred}},
issn = {{0031-9007}},
journal = {{Physical Review Letters}},
keywords = {{General Physics and Astronomy}},
number = {{15}},
publisher = {{American Physical Society (APS)}},
title = {{{Giant Photoelasticity of Polaritons for Detection of Coherent Phonons in a Superlattice with Quantum Sensitivity}}},
doi = {{10.1103/physrevlett.128.157401}},
volume = {{128}},
year = {{2022}},
}
@article{33332,
author = {{Bopp, Frederik and Rojas, Jonathan and Revenga, Natalia and Riedl, Hubert and Sbresny, Friedrich and Boos, Katarina and Simmet, Tobias and Ahmadi, Arash and Gershoni, David and Kasprzak, Jacek and Ludwig, Arne and Reitzenstein, Stephan and Wieck, Andreas and Reuter, Dirk and Müller, Kai and Finley, Jonathan J.}},
issn = {{2511-9044}},
journal = {{Advanced Quantum Technologies}},
keywords = {{Electrical and Electronic Engineering, Computational Theory and Mathematics, Condensed Matter Physics, Mathematical Physics, Nuclear and High Energy Physics, Electronic, Optical and Magnetic Materials, Statistical and Nonlinear Physics}},
publisher = {{Wiley}},
title = {{{Quantum Dot Molecule Devices with Optical Control of Charge Status and Electronic Control of Coupling}}},
doi = {{10.1002/qute.202200049}},
year = {{2022}},
}
@article{35128,
abstract = {{Here we demonstrate a new, to the best of our knowledge, type of 3-dB coupler that has an ultra-broadband operational range from 1300 to 1600 nm with low fabrication sensitivity. The overall device size is 800 µm including in/out S-bend waveguides. The coupler is an asymmetric non-uniform directional coupler that consists of two tapered waveguides. One of the coupler arms is shifted by 100 µm in the propagation direction, which results in a more wavelength-insensitive 3-dB response compared to a standard (not shifted) coupler. Moreover, compared to a long adiabatic coupler, we achieved a similar wavelength response at a 16-times-smaller device length. The couplers were fabricated using the silicon nitride platform of Lionix International. We also experimentally demonstrated an optical switch that is made by using two of these couplers in a Mach–Zehnder interferometer configuration. According to experimental results, this optical switch exhibits –10 dB of extinction ratio over the 1500–1600 nm wavelength range. Our results indicate that this new type of coupler holds great promise for various applications, including optical imaging, telecommunications, and reconfigurable photonic processors where compact, fabrication-tolerant, and wavelength-insensitive couplers are essential.}},
author = {{Nikbakht, Hamed and Khoshmehr, Mohammad Talebi and van Someren, Bob and Teichrib, Dieter and Hammer, Manfred and Förstner, Jens and Akca, B. Imran}},
issn = {{0146-9592}},
journal = {{Optics Letters}},
keywords = {{tet_topic_waveguide}},
number = {{2}},
pages = {{207}},
publisher = {{Optica Publishing Group}},
title = {{{Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint}}},
doi = {{10.1364/ol.476537}},
volume = {{48}},
year = {{2022}},
}
@article{34056,
abstract = {{ A process sequence enabling the large-area fabrication of nanopillar-patterned semiconductor templates for selective-area heteroepitaxy is developed. Herein, the nanopillar tops surrounded by a SiNx mask film serve as nanoscale growth areas. The molecular beam epitaxial growth of InAs on such patterned GaAs[Formula: see text]A templates is investigated by means of electron microscopy. It is found that defect-free nanoscale InAs islands grow selectively on the nanopillar tops at a substrate temperature of 425 °C. High-angle annular dark-field scanning transmission electron microscopy imaging reveals that for a growth temperature of 400 °C, the InAs islands show a tendency to form wurtzite phase arms extending along the lateral [Formula: see text] directions from the central zinc blende region of the islands. This is ascribed to a temporary self-catalyzed vapor–liquid–solid growth on [Formula: see text] B facets, which leads to a kinetically induced preference for the nucleation of the wurtzite phase driven by the local, instantaneous V/III ratio, and to a concomitant reduction of surface energy of the nanoscale diameter arms. }},
author = {{Riedl, Thomas and Kunnathully, Vinay S. and Verma, Akshay Kumar and Langer, Timo and Reuter, Dirk and Büker, Björn and Hütten, Andreas and Lindner, Jörg}},
issn = {{0021-8979}},
journal = {{Journal of Applied Physics}},
keywords = {{General Physics and Astronomy}},
number = {{18}},
publisher = {{AIP Publishing}},
title = {{{Selective area heteroepitaxy of InAs nanostructures on nanopillar-patterned GaAs(111)A}}},
doi = {{10.1063/5.0121559}},
volume = {{132}},
year = {{2022}},
}
@article{34053,
author = {{Riedl, Thomas and Kunnathully, Vinay and Trapp, Alexander and Langer, Timo and Reuter, Dirk and Lindner, Jörg}},
issn = {{2196-7350}},
journal = {{Advanced Materials Interfaces}},
keywords = {{Mechanical Engineering, Mechanics of Materials}},
number = {{11}},
publisher = {{Wiley}},
title = {{{Size‐Dependent Strain Relaxation in InAs Quantum Dots on Top of GaAs(111)A Nanopillars}}},
doi = {{10.1002/admi.202102159}},
volume = {{9}},
year = {{2022}},
}
@article{34086,
author = {{Bürger, Julius and Venugopal, Harikrishnan and Kool, Daniel and de los Arcos de Pedro, Maria Teresa and Gonzalez Orive, Alejandro and Grundmeier, Guido and Brassat, Katharina and Lindner, Jörg}},
issn = {{2196-7350}},
journal = {{Advanced Materials Interfaces}},
keywords = {{General Medicine}},
number = {{26}},
publisher = {{Wiley}},
title = {{{High‐Resolution Study of Changes in Morphology and Chemistry of Cylindrical PS‐ b ‐PMMA Block Copolymer Nanomasks during Mask Development}}},
doi = {{10.1002/admi.202200962}},
volume = {{9}},
year = {{2022}},
}
@inbook{33466,
abstract = {{We review our results of numerical simulations of light scattering from different systems of densely packed irregular particles. We consider spherical clusters, thick layers and monolayers with realistic topologies and dimensions much larger than the wavelength of light. The maximum bulk packing density of clusters is 0.5. A numerically exact solution of the electromagnetic problem is obtained using the Discontinuous Galerkin Time Domain method and with application of high- performance computing. We show that high packing density causes light localization in such structures which makes an impact on the opposition phenomena: backscattering intensity surge and negative linear polarization feature. Diffuse multiple scattering is significantly reduced in the case of non-absorbing particles and near-field interaction results in a percolation-like light transport determined by the topology of the medium. With this the negative polarization feature caused by single scattering gets enhanced if compared to lower density samples. We also confirm coherent double scattering mechanism of negative polarization for light scattered from dense absorbing slabs. In this case convergent result for the scattering angle polarization dependency at backscattering can be obtained for a layer of just a few tens of particles if they are larger than the wavelength.}},
author = {{Grynko, Yevgen and Shkuratov, Yuriy and Alhaddad, Samer and Förstner, Jens}},
booktitle = {{Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media}},
editor = {{Kokhanovsky, Alexander}},
isbn = {{9783031102974}},
issn = {{2509-2790}},
keywords = {{tet_topic_scattering}},
publisher = {{Springer International Publishing}},
title = {{{Light Scattering by Large Densely Packed Clusters of Particles}}},
doi = {{10.1007/978-3-031-10298-1_4}},
volume = {{8}},
year = {{2022}},
}
@article{33671,
abstract = {{Abstract
We demonstrate the fabrication of micron-wide tungsten silicide superconducting nanowire single-photon detectors on a silicon substrate using laser lithography. We show saturated internal detection efficiencies with wire widths ranging from 0.59 µm to 1.43 µm under illumination at 1550 nm. We demonstrate both straight wires, as well as meandered structures. Single-photon sensitivity is shown in devices up to 4 mm in length. Laser-lithographically written devices allow for fast and easy structuring of large areas while maintaining a saturated internal efficiency for wire widths around 1 µm.}},
author = {{Protte, Maximilian and Verma, Varun B and Höpker, Jan Philipp and Mirin, Richard P and Woo Nam, Sae and Bartley, Tim}},
issn = {{0953-2048}},
journal = {{Superconductor Science and Technology}},
keywords = {{Materials Chemistry, Electrical and Electronic Engineering, Metals and Alloys, Condensed Matter Physics, Ceramics and Composites}},
number = {{5}},
publisher = {{IOP Publishing}},
title = {{{Laser-lithographically written micron-wide superconducting nanowire single-photon detectors}}},
doi = {{10.1088/1361-6668/ac5338}},
volume = {{35}},
year = {{2022}},
}
@article{30342,
author = {{Lange, Nina Amelie and Höpker, Jan Philipp and Ricken, Raimund and Quiring, Viktor and Eigner, Christof and Silberhorn, Christine and Bartley, Tim}},
issn = {{2334-2536}},
journal = {{Optica}},
keywords = {{Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials}},
number = {{1}},
publisher = {{The Optical Society}},
title = {{{Cryogenic integrated spontaneous parametric down-conversion}}},
doi = {{10.1364/optica.445576}},
volume = {{9}},
year = {{2022}},
}
@article{33672,
abstract = {{Abstract
Lithium niobate is a promising platform for integrated quantum optics. In this platform, we aim to efficiently manipulate and detect quantum states by combining superconducting single photon detectors and modulators. The cryogenic operation of a superconducting single photon detector dictates the optimisation of the electro-optic modulators under the same operating conditions. To that end, we characterise a phase modulator, directional coupler, and polarisation converter at both ambient and cryogenic temperatures. The operation voltage
V
π
/
2
of these modulators increases, due to the decrease in the electro-optic effect, by 74% for the phase modulator, 84% for the directional coupler and 35% for the polarisation converter below 8.5
K
. The phase modulator preserves its broadband nature and modulates light in the characterised wavelength range. The unbiased bar state of the directional coupler changed by a wavelength shift of 85
n
m
while cooling the device down to 5
K
. The polarisation converter uses periodic poling to phasematch the two orthogonal polarisations. The phasematched wavelength of the utilised poling changes by 112
n
m
when cooling to 5
K
.}},
author = {{Thiele, Frederik and vom Bruch, Felix and Brockmeier, Julian and Protte, Maximilian and Hummel, Thomas and Ricken, Raimund and Quiring, Viktor and Lengeling, Sebastian and Herrmann, Harald and Eigner, Christof and Silberhorn, Christine and Bartley, Tim}},
issn = {{2515-7647}},
journal = {{Journal of Physics: Photonics}},
keywords = {{Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials}},
number = {{3}},
publisher = {{IOP Publishing}},
title = {{{Cryogenic electro-optic modulation in titanium in-diffused lithium niobate waveguides}}},
doi = {{10.1088/2515-7647/ac6c63}},
volume = {{4}},
year = {{2022}},
}
@article{33673,
abstract = {{ Superconducting Nanowire Single Photon Detectors (SNSPDs) have become an integral part of quantum optics in recent years because of their high performance in single photon detection. We present a method to replace the electrical input by supplying the required bias current via the photocurrent of a photodiode situated on the cold stage of the cryostat. Light is guided to the bias photodiode through an optical fiber, which enables a lower thermal conduction and galvanic isolation between room temperature and the cold stage. We show that an off-the-shelf InGaAs–InP photodiode exhibits a responsivity of at least 0.55 A/W at 0.8 K. Using this device to bias an SNSPD, we characterize the count rate dependent on the optical power incident on the photodiode. This configuration of the SNSPD and photodiode shows an expected plateau in the single photon count rate with an optical bias power on the photodiode above 6.8 µW. Furthermore, we compare the same detector under both optical and electrical bias, and show there is no significant changes in performance. This has the advantage of avoiding an electrical input cable, which reduces the latent heat load by a factor of 100 and, in principle, allows for low loss RF current supply at the cold stage. }},
author = {{Thiele, Frederik and Hummel, Thomas and Protte, Maximilian and Bartley, Tim}},
issn = {{2378-0967}},
journal = {{APL Photonics}},
keywords = {{Computer Networks and Communications, Atomic and Molecular Physics, and Optics}},
number = {{8}},
publisher = {{AIP Publishing}},
title = {{{Opto-electronic bias of a superconducting nanowire single photon detector using a cryogenic photodiode}}},
doi = {{10.1063/5.0097506}},
volume = {{7}},
year = {{2022}},
}
@article{54849,
abstract = {{The third‐order susceptibility of lithium niobate (LiNbO3) is calculated within a Berry‐phase formulation of the dynamical polarization based on the electronic structure obtained within density‐functional theory (DFT). Maximum values of the order of m V are calculated for photon energies between 1.2 and 2 eV, i.e., in the lower half of the optical bandgap of lithium niobate. Both free and bound electron (bi)polarons are found to lead to a remarkable enhancement of the third‐order susceptibility for photon energies below 1 eV.}},
author = {{Kozub, Agnieszka L. and Gerstmann, Uwe and Schmidt, Wolf Gero}},
issn = {{0370-1972}},
journal = {{physica status solidi (b)}},
number = {{2}},
publisher = {{Wiley}},
title = {{{Third‐Order Susceptibility of Lithium Niobate: Influence of Polarons and Bipolarons}}},
doi = {{10.1002/pssb.202200453}},
volume = {{260}},
year = {{2022}},
}