TY - JOUR
AB - Broadband coherent anti-Stokes Raman scattering (BCARS) is a powerful spectroscopy method combining high signal intensity with spectral sensitivity, enabling rapid imaging of heterogeneous samples in biomedical research and, more recently, in crystalline materials. However, BCARS encounters spectral distortion due to a setup-dependent non-resonant background (NRB). This study assesses BCARS reproducibility through a round robin experiment using two distinct BCARS setups and crystalline materials with varying structural complexity, including diamond, 6H-SiC, KDP, and KTP. The analysis compares setup-specific NRB correction procedures, detected and NRB-removed spectra, and mode assignment. We determine the influence of BCARS setup parameters like pump wavelength, pulse width, and detection geometry and provide a practical guide for optimizing BCARS setups for solid-state applications.
AU - Hempel, Franz
AU - Vernuccio, Federico
AU - König, Lukas
AU - Buschbeck, Robin
AU - Rüsing, Michael
AU - Cerullo, Giulio
AU - Polli, Dario
AU - Eng, Lukas M.
ID - 49652
IS - 1
JF - Applied Optics
KW - Atomic and Molecular Physics
KW - and Optics
KW - Engineering (miscellaneous)
KW - Electrical and Electronic Engineering
SN - 1559-128X
TI - Comparing transmission- and epi-BCARS: a round robin on solid-state materials
VL - 63
ER -
TY - JOUR
AU - Heinisch, Nils
AU - Köcher, Nikolas
AU - Bauch, David
AU - Schumacher, Stefan
ID - 50829
IS - 1
JF - Physical Review Research
SN - 2643-1564
TI - Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs
VL - 6
ER -
TY - JOUR
AB - Superconducting nanowire single-photon detectors (SNSPDs) have been widely used to study the discrete nature of quantum states of light in the form of photon-counting experiments. We show that SNSPDs can also be used to study continuous variables of optical quantum states by performing homodyne detection at a bandwidth of 400 kHz. By measuring the interference of a continuous-wave field of a local oscillator with the field of the vacuum state using two SNSPDs, we show that the variance of the difference in count rates is linearly proportional to the photon flux of the local oscillator over almost five orders of magnitude. The resulting shot-noise clearance of (46.0 ± 1.1) dB is the highest reported clearance for a balanced optical homodyne detector, demonstrating their potential for measuring highly squeezed states in the continuous-wave regime. In addition, we measured a CMRR = 22.4 dB. From the joint click counting statistics, we also measure the phase-dependent quadrature of a weak coherent state to demonstrate our device’s functionality as a homodyne detector.
AU - Protte, Maximilian
AU - Schapeler, Timon
AU - Sperling, Jan
AU - Bartley, Tim
ID - 50840
IS - 1
JF - Optica Quantum
SN - 2837-6714
TI - Low-noise balanced homodyne detection with superconducting nanowire single-photon detectors
VL - 2
ER -
TY - JOUR
AU - Wingenbach, Jan
AU - Schumacher, Stefan
AU - Ma, Xuekai
ID - 51105
JF - Physical Review Research, in press
TI - Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian polariton systems
ER -
TY - JOUR
AU - Liang, Qian
AU - Ma, Xuekai
AU - Gu, Chunling
AU - Ren, Jiahuan
AU - An, Cunbin
AU - Fu, Hongbing
AU - Schumacher, Stefan
AU - Liao, Qing
ID - 51104
JF - Journal of the American Chemical Society (JACS)
TI - Photochemical Reaction Enabling the Engineering of Photonic Spin−Orbit Coupling in Organic-Crystal Optical Microcavities
ER -
TY - JOUR
AU - Schneider, Tobias
AU - Gao, Wenlong
AU - Zentgraf, Thomas
AU - Schumacher, Stefan
AU - Ma, Xuekai
ID - 51106
JF - Nanophotonics
TI - Topological edge and corner states in coupled wave lattices in nonlinear polariton condensates
ER -
TY - JOUR
AB - Ferroelectric domain wall (DW) conductivity (DWC) can be attributed to two separate mechanisms: (a) the injection/ejection of charge carriers across the Schottky barrier formed at the (metal-)electrode-DW junction and (b) the transport of those charge carriers along the DW. Current-voltage (I-U) characteristics, recorded at variable temperatures from LiNbO3 (LNO) DWs, are clearly able to differentiate between these two contributions. Practically, they allow us to directly quantify the physical parameters relevant to the two mechanisms (a) and (b) mentioned above. These are, for example, the resistance of the DW, the saturation current, the ideality factor, and the Schottky barrier height of the electrode-DW junction. Furthermore, the activation energies needed to initiate the thermally activated electronic transport along the DWs can be extracted. In addition, we show that electronic transport along LNO DWs can be elegantly viewed and interpreted in an adapted semiconductor picture based on a double-diode, double-resistor equivalent-circuit model, the R2D2 model. Finally, our R2D2 model was checked for its universality by successfully fitting the I-U curves of not only z-cut LNO bulk DWs, but equally of z-cut thin-film LNO DWs, and of x-cut thin-film DWs as reported in literature.
AU - Zahn, Manuel
AU - Beyreuther, Elke
AU - Kiseleva, Iuliia
AU - Lotfy, Ahmed Samir
AU - McCluskey, Conor J.
AU - Maguire, Jesi R.
AU - Suna, Ahmet
AU - Rüsing, Michael
AU - Gregg, J. Marty
AU - Eng, Lukas M.
ID - 51156
IS - 2
JF - Physical Review Applied
KW - General Physics and Astronomy
SN - 2331-7019
TI - Equivalent-circuit model that quantitatively describes domain-wall conductivity in ferroelectric lithium
VL - 21
ER -
TY - JOUR
AB - Charge transfer mechanism in the deprotonation-induced n-type doping of PCBM.
AU - Dong, Chuan-Ding
AU - Bauch, Fabian
AU - Hu, Yuanyuan
AU - Schumacher, Stefan
ID - 51221
IS - 5
JF - Physical Chemistry Chemical Physics
KW - Physical and Theoretical Chemistry
KW - General Physics and Astronomy
SN - 1463-9076
TI - Charge transfer in superbase n-type doping of PCBM induced by deprotonation
VL - 26
ER -
TY - BOOK
ED - Blumberg, Eva
ED - Niederhaus, Constanze
ED - Mischendahl, Anne
ID - 40014
TI - Mehrsprachigkeit in der Schule. Sprachbildung im und durch Sachunterricht.
ER -
TY - JOUR
AU - Babai-Hemati, Jonas
AU - vom Bruch, Felix
AU - Herrmann, Harald
AU - Silberhorn, Christine
ID - 51339
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Tailored second harmonic generation inTi-diffused PPLN waveguides usingmicro-heaters
ER -
TY - JOUR
AU - Cui, Tie Jun
AU - Zhang, Shuang
AU - Alu, Andrea
AU - Wegener, Martin
AU - Pendry, John
AU - Luo, Jie
AU - Lai, Yun
AU - Wang, Zuojia
AU - Lin, Xiao
AU - Chen, Hongsheng
AU - Chen, Ping
AU - Wu, Rui-Xin
AU - Yin, Yuhang
AU - Zhao, Pengfei
AU - Chen, Huanyang
AU - Li, Yue
AU - Zhou, Ziheng
AU - Engheta, Nader
AU - Asadchy, V. S.
AU - Simovski, Constantin
AU - Tretyakov, Sergei A
AU - Yang, Biao
AU - Campbell, Sawyer D.
AU - Hao, Yang
AU - Werner, Douglas H
AU - Sun, Shulin
AU - Zhou, Lei
AU - Xu, Su
AU - Sun, Hong-Bo
AU - Zhou, Zhou
AU - Li, Zile
AU - Zheng, Guoxing
AU - Chen, Xianzhong
AU - Li, Tao
AU - Zhu, Shi-Ning
AU - Zhou, Junxiao
AU - Zhao, Junxiang
AU - Liu, Zhaowei
AU - Zhang, Yuchao
AU - Zhang, Qiming
AU - Gu, Min
AU - Xiao, Shumin
AU - Liu, Yongmin
AU - Zhang, Xiaoyu
AU - Tang, Yutao
AU - Li, Guixin
AU - Zentgraf, Thomas
AU - Koshelev, Kirill
AU - Kivshar, Yuri S.
AU - Li, Xin
AU - Badloe, Trevon
AU - Huang, Lingling
AU - Rho, Junsuk
AU - Wang, Shuming
AU - Tsai, Din Ping
AU - Bykov, A. Yu.
AU - Krasavin, Alexey V
AU - Zayats, Anatoly V
AU - McDonnell, Cormac
AU - Ellenbogen, Tal
AU - Luo, Xiangang
AU - Pu, Mingbo
AU - Garcia-Vidal, Francisco J
AU - Liu, Liangliang
AU - Li, Zhuo
AU - Tang, Wenxuan
AU - Ma, Hui Feng
AU - Zhang, Jingjing
AU - Luo, Yu
AU - Zhang, Xuanru
AU - Zhang, Hao Chi
AU - He, Pei Hang
AU - Zhang, Le Peng
AU - Wan, Xiang
AU - Wu, Haotian
AU - Liu, Shuo
AU - Jiang, Wei Xiang
AU - Zhang, Xin Ge
AU - Qiu, Chengwei
AU - Ma, Qian
AU - Liu, Che
AU - Li, Long
AU - Han, Jiaqi
AU - Li, Lianlin
AU - Cotrufo, Michele
AU - Caloz, Christophe
AU - Deck-Léger, Z.-L.
AU - Bahrami, A.
AU - Céspedes, O.
AU - Galiffi, Emanuele
AU - Huidobro, P. A.
AU - Cheng, Qiang
AU - Dai, Jun Yan
AU - Ke, Jun Cheng
AU - Zhang, Lei
AU - Galdi, Vincenzo
AU - Di Renzo, Marco
ID - 51519
JF - Journal of Physics: Photonics
KW - Electrical and Electronic Engineering
KW - Atomic and Molecular Physics
KW - and Optics
KW - Electronic
KW - Optical and Magnetic Materials
SN - 2515-7647
TI - Roadmap on electromagnetic metamaterials and metasurfaces
ER -
TY - JOUR
AU - Zietlow, Christian
AU - Lindner, Jörg
ID - 52090
JF - Numerical Algorithms
TI - ADMM-TGV image restoration for scientific applications with unbiased parameter choice
ER -
TY - JOUR
AU - Bauch, Fabian
AU - Dong, Chuan-Ding
AU - Schumacher, Stefan
ID - 52534
IS - 8
JF - The Journal of Physical Chemistry C
KW - Surfaces
KW - Coatings and Films
KW - Physical and Theoretical Chemistry
KW - General Energy
KW - Electronic
KW - Optical and Magnetic Materials
SN - 1932-7447
TI - Dynamics of Electron–Hole Coulomb Attractive Energy and Dipole Moment of Hot Excitons in Donor–Acceptor Polymers
VL - 128
ER -
TY - JOUR
AB - Miller's rule is an empirical relation between the nonlinear and linear optical coefficients that applies to a large class of materials but has only been rigorously derived for the classical Lorentz model with a weak anharmonic perturbation. In this work, we extend the proof and present a detailed derivation of Miller's rule for an equivalent quantum-mechanical anharmonic oscillator. For this purpose, the classical concept of velocity-dependent damping inherent to the Lorentz model is replaced by an adiabatic switch-on of the external electric field, which allows a unified treatment of the classical and quantum-mechanical systems using identical potentials and fields. Although the dynamics of the resulting charge oscillations, and hence the induced polarizations, deviate due to the finite zero-point motion in the quantum-mechanical framework, we find that Miller's rule is nevertheless identical in both cases up to terms of first order in the anharmonicity. With a view to practical applications, especially in the context of ab initio calculations for the optical response where adiabatically switched-on fields are widely assumed, we demonstrate that a correct treatment of finite broadening parameters is essential to avoid spurious errors that may falsely suggest a violation of Miller's rule, and we illustrate this point by means of a numerical example.
AU - Meyer, Maximilian Tim
AU - Schindlmayr, Arno
ID - 52723
JF - Journal of Physics B: Atomic, Molecular and Optical Physics
SN - 0953-4075
TI - Derivation of Miller's rule for the nonlinear optical susceptibility of a quantum anharmonic oscillator
ER -
TY - JOUR
AU - Arends, Christian
AU - Wolf, Lasse Lennart
AU - Meinecke, Jasmin
AU - Barkhofen, Sonja
AU - Weich, Tobias
AU - Bartley, Tim
ID - 52876
IS - 1
JF - Physical Review Research
KW - General Physics and Astronomy
SN - 2643-1564
TI - Decomposing large unitaries into multimode devices of arbitrary size
VL - 6
ER -
TY - JOUR
AB - Superconducting nanowire single-photon detectors (SNSPDs) show near unity efficiency, low dark count rate, and short recovery time. Combining these characteristics with temporal control of SNSPDs broadens their applications as in active de-latching for higher dynamic range counting or temporal filtering for pump-probe spectroscopy or LiDAR. To that end, we demonstrate active gating of an SNSPD with a minimum off-to-on rise time of 2.4 ns and a total gate length of 5.0 ns. We show how the rise time depends on the inductance of the detector in combination with the control electronics. The gate window is demonstrated to be fully and freely, electrically tunable up to 500 ns at a repetition rate of 1.0 MHz, as well as ungated, free-running operation. Control electronics to generate the gating are mounted on the 2.3 K stage of a closed-cycle sorption cryostat, while the detector is operated on the cold stage at 0.8 K. We show that the efficiency and timing jitter of the detector is not altered during the on-time of the gating window. We exploit gated operation to demonstrate a method to increase in the photon counting dynamic range by a factor 11.2, as well as temporal filtering of a strong pump in an emulated pump-probe experiment.
AU - Hummel, Thomas
AU - Widhalm, Alex
AU - Höpker, Jan Philipp
AU - Jöns, Klaus
AU - Chang, Jin
AU - Fognini, Andreas
AU - Steinhauer, Stephan
AU - Zwiller, Val
AU - Zrenner, Artur
AU - Bartley, Tim
ID - 36471
IS - 1
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Nanosecond gating of superconducting nanowire single-photon detectors using cryogenic bias circuitry
VL - 31
ER -
TY - CONF
AU - Hoya, Fabian Karl
AU - Schulze, Jan Roland
AU - Blumberg, Eva
AU - Hellmich, Frank
ID - 35892
TI - Effekte des Feedbacks von Lehrkräften auf die Selbstwirksamkeitsüberzeugungen und die intrinsische Motivation von Kindern im naturwissenschaftlichen Sachunterricht der Grundschule. Vortrag auf der 10. Tagung der Gesellschaft für Empirische Bildungsforschung (GEBF). Thema: „Bildung zwischen Unsicherheit und Evidenz“
ER -
TY - THES
AB - Für den Erwerb fachmethodischer Fähigkeiten stellen Laborpraktika eine zentrale Lerngelegenheiten des Physikstudiums dar. Trotz ihrer hohen Bedeutung fehlt ein hochschulfachdidaktischer Diskurs zu einer lehr-lerntheoretischen Fundierung. Zudem wird ihre Lernwirksamkeit aufgrund der bestehenden didaktischen Gestaltung kritisiert. Die weit verbreiteten engmaschigen Aufgabenstellungen enthalten keine Anreize zur tiefergehenden Auseinandersetzung mit den Inhalten. Um der Diskrepanz zwischen den Zielsetzungen und den von den Lernenden erworbenen Fähigkeiten entgegenzuwirken, liegen aktuell nur wenige und zudem nur punktuelle Grundlagen für eine evidenzbasierte Überarbeitung dieses Veranstaltungsformates vor. Ziel dieser Arbeit ist daher, einen Vorschlag für ein performanzorientiertes Kompetenzstrukturmodell auf universitärem Niveau zu entwickeln, das die Inhaltsbereiche, die experimentellen Fähigkeiten und Fertigkeiten sowie die Qualitätsausprägungen experimenteller Handlungen systematisiert.Die Modellierung ist auf Basis der Analyse videografierter experimenteller Performanz von 16 unterschiedlich fähigen Proband:innen realisiert worden. Für die Entwicklung der Dimensionen Fachmethodik und Qualitätsausprägung werden unter Nutzung der qualitativen Forschungsansätze Dokumentarische Methode und Typenbildung die charakteristischen Merkmale universitären Experimentierens identifiziert und anschließend systematisiert. Zur Prüfung der Passung des Modells zur Perspektive der Wissenschaft Physik ist ein Interrating mit einem Fachwissenschaftler durchgeführt worden, das sehr gute Übereinstimmungswerte liefert. Die Passung des Modells zur Perspektive der Praktikumsleiter:innen ist durch ein Expertenrating erfolgt. Ein Rangfolgen-Vergleich zeigt hohe Übereinstimmungswerte.
AU - Bauer, Anna Brigitte
ID - 37645
TI - Experimentelle Kompetenz Physikstudierender
ER -
TY - CHAP
AU - Schröer, Franz
AU - Tenberge, Claudia
ED - Gill, David
ED - Irving-Bell, Dawne
ED - McLain, Matt
ED - Wooff, David
ID - 37641
KW - Curriculum
KW - Inclusion
KW - Sachunterricht
KW - Participation
SN - 9781350238411
T2 - Bloomsbury Handbook of Technology Education
TI - Including: Thinking Towards an Inclusive Curriculum for Technology Education in German Primary Schools
ER -
TY - JOUR
AU - Janicki, Nicole
AU - Tenberge, Claudia
ID - 39976
JF - Australasian Journal of Technology Education
KW - technology education
KW - teacher professionalisation
KW - Computational Thinking
KW - digitalization
KW - learning robots
TI - Technology education in elementary school using the example of 'learning robots' – development and evaluation of an in-service teacher training concept
ER -
TY - CONF
AU - Schmidt, Rebekka
AU - Tenberge, Claudia
AU - Häsel-Weide, Uta
ED - Vöing, Nerea
ED - Schmidt, Rebekka
ED - Neiske, Iris
ID - 40520
TI - Lehre in Zeiten von Digitalisierung und Inklusion – Beispiele aus drei Fächern.
ER -
TY - JOUR
AU - Sharapova, Polina R.
AU - Kruk, Sergey S.
AU - Solntsev, Alexander S.
ID - 41035
JF - Laser & Photonics Reviews
KW - Condensed Matter Physics
KW - Atomic and Molecular Physics
KW - and Optics
KW - Electronic
KW - Optical and Magnetic Materials
SN - 1863-8880
TI - Nonlinear Dielectric Nanoresonators and Metasurfaces: Toward Efficient Generation of Entangled Photons
ER -
TY - GEN
AB - Long-range quantum communication requires the development of in-out
light-matter interfaces to achieve a quantum advantage in entanglement
distribution. Ideally, these quantum interconnections should be as fast as
possible to achieve high-rate entangled qubits distribution. Here, we
demonstrate the coherent quanta exchange between single photons generated
on-demand from a GaAs quantum dot and atomic ensemble in a $^{87}$Rb vapor
quantum memory. Through an open quantum system analysis, we demonstrate the
mapping between the quantized electric field of photons and the coherence of
the atomic ensemble. Our results play a pivotal role in understanding quantum
light-matter interactions at the short time scales required to build fast
hybrid quantum networks.
AU - Cui, Guo-Dong
AU - Schweickert, Lucas
AU - Jöns, Klaus D.
AU - Namazi, Mehdi
AU - Lettner, Thomas
AU - Zeuner, Katharina D.
AU - Montaña, Lara Scavuzzo
AU - Silva, Saimon Filipe Covre da
AU - Reindl, Marcus
AU - Huang, Huiying
AU - Trotta, Rinaldo
AU - Rastelli, Armando
AU - Zwiller, Val
AU - Figueroa, Eden
ID - 42049
T2 - arXiv:2301.10326
TI - Coherent Quantum Interconnection between On-Demand Quantum Dot Single Photons and a Resonant Atomic Quantum Memory
ER -
TY - JOUR
AU - Lüders, Carolin
AU - Gil-Lopez, Jano
AU - Allgaier, Markus
AU - Brecht, Benjamin
AU - Aßmann, Marc
AU - Silberhorn, Christine
AU - Bayer, Manfred
ID - 42158
IS - 1
JF - Physical Review Applied
KW - General Physics and Astronomy
SN - 2331-7019
TI - Tailored Frequency Conversion Makes Infrared Light Visible for Streak Cameras
VL - 19
ER -
TY - JOUR
AU - Liang, Qian
AU - Ma, Xuekai
AU - Long, Teng
AU - Yao, Jiannian
AU - Liao, Qing
AU - Fu, Hongbing
ID - 35077
IS - 9
JF - Angewandte Chemie International Edition
KW - General Chemistry
KW - Catalysis
SN - 1433-7851
TI - Circularly Polarized Lasing from a Microcavity Filled with Achiral Single‐Crystalline Microribbons
VL - 62
ER -
TY - JOUR
AB - In real photonic quantum systems losses are an unavoidable factor limiting the scalability to many modes and particles, restraining their application in fields as quantum information and communication. For this reason, a considerable amount of engineering effort has been taken in order to improve the quality of particle sources and system components. At the same time, data analysis and collection methods based on post-selection have been used to mitigate the effect of particle losses. This has allowed for investigating experimentally multi-particle evolutions where the observer lacks knowledge about the system's intermediate propagation states. Nonetheless, the fundamental question how losses affect the behaviour of the surviving subset of a multi-particle system has not been investigated so far. For this reason, here we study the impact of particle losses in a quantum walk of two photons reconstructing the output probability distributions for one photon conditioned on the loss of the other in a known mode and temporal step of our evolution network. We present the underlying theoretical scheme that we have devised in order to model controlled particle losses, we describe an experimental platform capable of implementing our theory in a time multiplexing encoding. In the end we show how localized particle losses change the output distributions without altering their asymptotic spreading properties. Finally we devise a quantum civilization problem, a two walker generalisation of single particle recurrence processes.
AU - Pegoraro, Federico
AU - Held, Philip
AU - Barkhofen, Sonja
AU - Brecht, Benjamin
AU - Silberhorn, Christine
ID - 42648
IS - 3
JF - Physica Scripta
SN - 0031-8949
TI - Dynamic conditioning of two particle discrete-time quantum walks
VL - 98
ER -
TY - JOUR
AB - The achievement of a flat metasurface has realized extraordinary control over light–matter interaction at the nanoscale, enabling widespread use in imaging, holography, and biophotonics. However, three-dimensional metasurfaces with the potential to provide additional light–matter manipulation flexibility attract only little interest. Here, we demonstrate a three-dimensional metasurface scheme capable of providing dual phase control through out-of-plane plasmonic resonance of L-shape antennas. Under circularly polarized excitation at a specific wavelength, the L-shape antennas with rotating orientation angle act as spatially variant three-dimensional tilted dipoles and are able to generate desire phase delay for different polarization components. Generalized Snell's law is achieved for both in-plane and out-of-plane dipole components through arranging such L-shape antennas into arrays. These three-dimensional metasurfaces suggest a route for wavefront modulation and a variety of nanophotonic applications.
AU - Li, Tianyou
AU - Chen, Yanjie
AU - Wang, Yongtian
AU - Zentgraf, Thomas
AU - Huang, Lingling
ID - 43421
IS - 14
JF - Applied Physics Letters
KW - Physics and Astronomy (miscellaneous)
SN - 0003-6951
TI - Three-dimensional dipole momentum analog based on L-shape metasurface
VL - 122
ER -
TY - JOUR
AU - De, Jianbo
AU - Ma, Xuekai
AU - Yin, Fan
AU - Ren, Jiahuan
AU - Yao, Jiannian
AU - Schumacher, Stefan
AU - Liao, Qing
AU - Fu, Hongbing
AU - Malpuech, Guillaume
AU - Solnyshkov, Dmitry
ID - 36416
IS - 3
JF - Journal of the American Chemical Society (JACS)
KW - Colloid and Surface Chemistry
KW - Biochemistry
KW - General Chemistry
KW - Catalysis
SN - 0002-7863
TI - Room-Temperature Electrical Field-Enhanced Ultrafast Switch in Organic Microcavity Polariton Condensates
VL - 145
ER -
TY - JOUR
AU - Jia, Jichao
AU - Cao, Xue
AU - Ma, Xuekai
AU - De, Jianbo
AU - Yao, Jiannian
AU - Schumacher, Stefan
AU - Liao, Qing
AU - Fu, Hongbing
ID - 35160
IS - 1
JF - Nature Communications
KW - General Physics and Astronomy
KW - General Biochemistry
KW - Genetics and Molecular Biology
KW - General Chemistry
KW - Multidisciplinary
SN - 2041-1723
TI - Circularly polarized electroluminescence from a single-crystal organic microcavity light-emitting diode based on photonic spin-orbit interactions
VL - 14
ER -
TY - JOUR
AU - Rose, Hendrik
AU - Vasil'ev, A. N.
AU - Tikhonova, O. V.
AU - Meier, Torsten
AU - Sharapova, Polina
ID - 37280
IS - 1
JF - Physical Review A
SN - 2469-9926
TI - Quantum-optical excitations of semiconductor nanostructures in a microcavity using a two-band model and a single-mode quantum field
VL - 107
ER -
TY - JOUR
AU - Cara, Eleonora
AU - Hönicke, Philipp
AU - Kayser, Yves
AU - Lindner, Jörg K. N.
AU - Castellino, Micaela
AU - Murataj, Irdi
AU - Porro, Samuele
AU - Angelini, Angelo
AU - De Leo, Natascia
AU - Pirri, Candido Fabrizio
AU - Beckhoff, Burkhard
AU - Boarino, Luca
AU - Ferrarese Lupi, Federico
ID - 42953
IS - 3
JF - ACS Applied Polymer Materials
KW - Organic Chemistry
KW - Polymers and Plastics
KW - Process Chemistry and Technology
SN - 2637-6105
TI - Developing Quantitative Nondestructive Characterization of Nanomaterials: A Case Study on Sequential Infiltration Synthesis of Block Copolymers
VL - 5
ER -
TY - JOUR
AU - Serino, Laura
AU - Gil López, Jano
AU - Stefszky, Michael
AU - Ricken, Raimund
AU - Eigner, Christof
AU - Brecht, Benjamin
AU - Silberhorn, Christine
ID - 44081
IS - 2
JF - PRX Quantum
KW - General Physics and Astronomy
KW - Mathematical Physics
KW - Applied Mathematics
KW - Electronic
KW - Optical and Magnetic Materials
KW - Electrical and Electronic Engineering
KW - General Computer Science
SN - 2691-3399
TI - Realization of a Multi-Output Quantum Pulse Gate for Decoding High-Dimensional Temporal Modes of Single-Photon States
VL - 4
ER -
TY - CONF
AB - The nonlinear optical response of quantum well excitons is investigated experimentally using polarization resolved four wave mixing, optical-pump optical-probe, and optical-pump Terahertz-probe spectroscopy. The four-wave mixing data reveal clear signatures of coherent biexcitons which concur with straight-forward polarization selection rules at the Γ point. The type-I samples show the well-established time-domain beating signatures in the transients as well as the corresponding spectral signatures clearly. The latter are also present in type-II samples; however, the smaller exciton and biexciton binding energies in these structures infer longer beating times which, in turn, are accompanied by faster dephasing of the type-II exciton coherences. Furthermore, the THz absorption following spectrally narrow, picosecond excitation at energies in the vicinity of the 1s exciton resonance are discussed. Here, the optical signatures yield the well-established redshifts and blueshifts for the appropriate polarization geometries in type-I quantum well samples also termed “AC Stark Effect”. The THz probe reveals intriguing spectral features which can be ascribed to coherent negative absorption following an excitation into a virtual state for an excitation below the 1s exciton resonance. Furthermore, the scattering and ionization of excitons is discussed for several excitation geometries yielding control rules for elastic and inelastic quasiparticle collisions.
AU - Meier, Torsten
AU - Stein, M.
AU - Schäfer, F.
AU - Anders, D.
AU - Littmann, J. H.
AU - Fey, M.
AU - Trautmann, Alexander
AU - Ngo, C.
AU - Steiner, J. T.
AU - Reichelt, Matthias
AU - Fuchs, C.
AU - Volz, K.
AU - Chatterjee, S.
ID - 43189
T2 - Ultrafast Phenomena and Nanophotonics XXVII
TI - Experimental studies of the excitonic nonlinear response of GaAs-based type-I and type-II quantum well structures interacting with optical and terahertz fields
VL - 12419
ER -
TY - CONF
AB - Anomalous currents refer to electronic currents that flow perpendicularly to the direction of the accelerating electric field. Such anomalous currents can be generated when Terahertz fields are applied after an optical interband excitation of GaAs quantum wells. The underlying processes are investigated by numerical solutions of the semiconductor Bloch equations in the length gauge. Excitonic effects are included by treating the manybody Coulomb interaction in time-dependent Hartree-Fock approximation and additionally also carrier-phonon scattering processes are considered. The band structure and matrix elements are obtained from a 14-band k · p model within the envelope function approximation. The random phase factors of the matrix elements that appear due to the separate numerical diagonalization at each k-point are treated by applying a smooth gauge transformation. We present the macroscopic Berry curvature and anomalous current transients with and without excitonic effects. It is demonstrated that the resonant optical excitation of excitonic resonances can significantly enhance the Berry curvature and the anomalous currents.
AU - Meier, Torsten
AU - Ngo, C.
AU - Priyadarshi, S.
AU - Duc, H. T.
AU - Bieler, M.
ID - 43191
T2 - Ultrafast Phenomena and Nanophotonics XXVII
TI - Terahertz-induced anomalous currents following the optical excitation of excitons in semiconductor quantum wells
VL - 12419
ER -
TY - CONF
AB - The nonlinear optical response of quantum well excitons excited by optical fields is analyzed by numerical solutions of the semiconductor Bloch equations. Differential absorption spectra are computed for resonant pumping at the exciton resonance and the dependence of the absorption changes on the polarization directions of the pump and probe pulses is investigated. Coherent biexcitonic many-body correlations are included in our approach up to third-order in the optical fields. Results are presented for spatially-direct type-I and spatiallyindirect type-II quantum well systems. Due to the spatial inhomogeneity, in type-II structures a finite coupling between excitons of opposite spins exists already on the Hartree-Fock level and contributes to the absorption changes for the case of opposite circularly polarized pump and probe pulses.
AU - Meier, Torsten
AU - Trautmann, Alexander
AU - Stein, M.
AU - Schäfer, F.
AU - Anders, D.
AU - Ngo, C.
AU - Steiner, J. T.
AU - Reichelt, Matthias
AU - Chatterjee, S.
ID - 43190
T2 - Ultrafast Phenomena and Nanophotonics XXVII
TI - Analysis of the nonlinear optical response of excitons in type-I and type-II quantum wells including many-body correlations
VL - 12419
ER -
TY - JOUR
AU - Meier, Torsten
AU - Schäfer, F.
AU - Stein, M.
AU - Lorenz, J.
AU - Dobener, F.
AU - Ngo, C.
AU - Steiner, J. T.
AU - Fuchs, C.
AU - Stolz, W.
AU - Volz, K.
AU - Hader, J.
AU - Moloney, J.V.
AU - Koch, S.W.
AU - Chatterjee, S.
ID - 43139
IS - 8
JF - Applied Physics Letters
TI - Gain recovery dynamics in active type-II semiconductor heterostructures
VL - 122
ER -
TY - GEN
AU - Meier, Torsten
AU - Grisard, S.
AU - Trifonov, A.V.
AU - Rose, Hendrik
AU - Reichhardt, R.
AU - Reichelt, Matthias
AU - Schneider, C.
AU - Kamp, M.
AU - Höfling, S.
AU - Bayer, M.
AU - Akimov, I.A
ID - 43132
T2 - arxiv:2302.02480
TI - Temporal sorting of optical multi-wave-mixing processes in semiconductor quantum dots
ER -
TY - JOUR
AU - Sperling, Jan
AU - Agudelo, Elizabeth
ID - 44050
IS - 4
JF - Physical Review A
SN - 2469-9926
TI - Entanglement of particles versus entanglement of fields: Independent quantum resources
VL - 107
ER -
TY - JOUR
AU - Sperling, Jan
AU - Gianani, Ilaria
AU - Barbieri, Marco
AU - Agudelo, Elizabeth
ID - 40477
IS - 1
JF - Physical Review A
SN - 2469-9926
TI - Detector entanglement: Quasidistributions for Bell-state measurements
VL - 107
ER -
TY - JOUR
AU - Lüders, Carolin
AU - Pukrop, Matthias
AU - Barkhausen, Franziska
AU - Rozas, Elena
AU - Schneider, Christian
AU - Höfling, Sven
AU - Sperling, Jan
AU - Schumacher, Stefan
AU - Aßmann, Marc
ID - 42973
IS - 11
JF - Physical Review Letters
KW - General Physics and Astronomy
SN - 0031-9007
TI - Tracking Quantum Coherence in Polariton Condensates with Time-Resolved Tomography
VL - 130
ER -
TY - BOOK
AU - Bauer, Anna Brigitte
ID - 44083
SN - 978-3-8325-5625-9
TI - Experimentelle Kompetenz Physikstudierender. Entwicklung und erste Erprobung eines performanzorientierten Kompetenzstrukturmodells unter Nutzung qualitativer Methoden
VL - 352
ER -
TY - JOUR
AB - Dispersion is present in every optical setup and is often an undesired effect, especially in nonlinear-optical experiments where ultrashort laser pulses are needed. Typically, bulky pulse compressors consisting of gratings or prisms are used
to address this issue by precompensating the dispersion of the optical components. However, these devices are only able to compensate for a part of the dispersion (second-order dispersion). Here, we present a compact pulse-shaping device that uses plasmonic metasurfaces to apply an arbitrarily designed spectral phase delay allowing for a full dispersion control. Furthermore, with specific phase encodings, this device can be used to temporally reshape the incident laser pulses into more complex pulse forms such as a double pulse. We verify the performance of our device by using an SHG-FROG measurement setup together with a retrieval algorithm to extract the dispersion that our device applies to an incident laser pulse.
AU - Geromel, René
AU - Georgi, Philip
AU - Protte, Maximilian
AU - Lei, Shiwei
AU - Bartley, Tim
AU - Huang, Lingling
AU - Zentgraf, Thomas
ID - 44044
IS - 8
JF - Nano Letters
KW - Mechanical Engineering
KW - Condensed Matter Physics
KW - General Materials Science
KW - General Chemistry
KW - Bioengineering
SN - 1530-6984
TI - Compact Metasurface-Based Optical Pulse-Shaping Device
VL - 23
ER -
TY - CHAP
AU - Kulgemeyer, Christoph
AU - Sterzing, Fabian
AU - Hörnlein, Madeleine
ED - Wilhelm, Thomas
ID - 45277
T2 - Digital Physik unterrichten. Grundlagen, Impulse, Perspektiven
TI - Aus Erklärvideos lernen
ER -
TY - CHAP
AU - Weiler, David
AU - Burde, Jan-Philipp
AU - Große-Heilmann, Rike Isabel
AU - Lachner, Andreas
AU - Riese, Josef
AU - Schubatzky, Thomas
ED - Meier, Monique
ED - Greefrath, Gilbert
ED - Hammann, Marcus
ED - Wodzinski, Rita
ED - Ziepprecht, Kathrin
ID - 45171
SN - 2524-8677
T2 - Lehr-Lern-Labore und Digitalisierung
TI - Förderung von digitalisierungsbezogenen Kompetenzen von angehenden Physiklehrkräften mit dem SQD-Modell im Projekt DiKoLeP
ER -
TY - CONF
AU - Kulgemeyer, Christoph
AU - Sterzing, Fabian
AU - Hörnlein, Madeleine
ED - Van Vorst, Helena
ID - 45398
TI - Von der "Shallowing Hypothese" zur "Illusion of Understanding" -wie wirken Erklärvideos und Lehrbuchtexte auf Wissen und Verstehensillusion?
ER -
TY - CONF
AU - Hörnlein, Madeleine
AU - Kulgemeyer, Christoph
ED - Van Vorst, Helena
ID - 45399
TI - "Aus Erklärvideos lernt man nur oberflächlich" - oder erwirbt man auch Konzeptwissen?
ER -
TY - JOUR
AU - Kruse, Stephan
AU - Serino, Laura
AU - Folge, Patrick Fabian
AU - Echeverria Oviedo, Dana
AU - Bhattacharjee, Abhinandan
AU - Stefszky, Michael
AU - Scheytt, J. Christoph
AU - Brecht, Benjamin
AU - Silberhorn, Christine
ID - 45485
IS - 14
JF - IEEE Photonics Technology Letters
KW - Electrical and Electronic Engineering
KW - Atomic and Molecular Physics
KW - and Optics
KW - Electronic
KW - Optical and Magnetic Materials
SN - 1041-1135
TI - A Pulsed Lidar System With Ultimate Quantum Range Accuracy
VL - 35
ER -
TY - CONF
AU - Buschütter, David
AU - Zeller, Jannis
AU - Oltmanns, Stefan
AU - Borowski, Andreas
AU - Kulgemeyer, Christoph
AU - Riese, Josef
AU - Vogelsang, Christoph
ED - van Vorst, Helena
ID - 45567
T2 - Lernen, Lehren und Forschen in einer digital geprägten Welt Gesellschaft für Didaktik der Chemie und Physik Jahrestagung in Aachen 2022
TI - Forschungsdatenmanagement erleichtern durch relationale Datenbanken: Ein Datenmodell für naturwissenschaftsdidaktische Forschung
ER -
TY - CONF
AU - Zwick, Linda
AU - Webersen, Yvonne
AU - Wodzinski, Rita
ED - van Vorst, Helena
ID - 45576
T2 - Lernen, Lehren und Forschen in einer digital geprägten Welt Gesellschaft für Didaktik der Chemie und Physik Jahrestagung in Aachen 2022
TI - Entwicklung von Schülervorstellungen zu NOS & NOSI im Physikunterricht
ER -
TY - CONF
AU - Webersen, Yvonne
ED - van Vorst, Helena
ID - 45577
T2 - Lernen, Lehren und Forschen in einer digital geprägten Welt Gesellschaft für Didaktik der Chemie und Physik Jahrestagung in Aachen 2022
TI - Entwicklung und Evaluation einer NdN-Unterrichtsreihe zur Unterstützung von Lernpfaden
ER -
TY - JOUR
AB - AbstractBased on a literature review of studies on teachers’ professional competence and related assessment tools, this paper introduces a model of teacher education assessment. It is influenced by Miller’s (1990) framework of assessment in medical education and includes, among other aspects, performance assessments. This model is used to understand the potential effects of transferring assessment tools into a digital format with assessment feedback. Five examples for such a transfer will be discussed: three methods for various aspects of communication, a test for pedagogical content knowledge, and a test for content knowledge. All five are established instruments well-described in terms of validity. All five have recently been transferred into a digital format. The analysis of this transfer also reveals a potentially harmful effect of digital assessment. The closer an assessment instrument is to assessing action-related parts of professional competence, the more authenticity is required; however, digitisation tends to decrease this authenticity. This suggests that an increasing number of digital assessment tools in teacher education might result in an even more dominant focus on knowledge tests, ignoring other parts of professional competence. This article highlights the role of authenticity in validity and discusses the most suitable assessment format to address various parts of professional competence. It ends by highlighting the lessons learned from the transfer of assessment instruments into a digital format that other academic disciplines might find interesting.
AU - Kulgemeyer, Christoph
AU - Riese, Josef
AU - Vogelsang, Christoph
AU - Buschhüter, David
AU - Borowski, Andreas
AU - Weißbach, Anna
AU - Jordans, Melanie
AU - Reinhold, Peter
AU - Schecker, Horst
ID - 45562
JF - Zeitschrift für Erziehungswissenschaft
KW - Education
SN - 1434-663X
TI - How authenticity impacts validity: Developing a model of teacher education assessment and exploring the effects of the digitisation of assessment methods Über Validität und Authentizität: Effekte des Transfers von Testinstrumenten in ein digitales Format auf die erhobenen Aspekte der professionellen Handlungskompetenz
ER -
TY - CONF
AU - Große-Heilmann, Rike Isabel
AU - Burde, Jan-Philipp
AU - Riese, Josef
AU - Schubatzky, Thomas
AU - Weiler, David
ED - van Vorst, Helena
ID - 45563
T2 - Lernen, Lehren und Forschen in einer digital geprägten Welt Gesellschaft für Didaktik der Chemie und Physik Jahrestagung in Aachen 2022
TI - Erwerb und Messung fachdidaktischen Wissens zum Einsatz digitaler Medien
ER -
TY - CONF
AU - Jordans, Melanie
AU - Riese, Josef
ED - van Vorst, Helena
ID - 45566
T2 - Lernen, Lehren und Forschen in einer digital geprägten Welt Gesellschaft für Didaktik der Chemie und Physik Jahrestagung in Aachen 2022
TI - Unterrichtsplanung mit sinnvoller Einbettung digitaler Medien im PU
ER -
TY - CONF
AU - Zeller, Jannis
AU - Riese, Josef
ED - van Vorst, Helena
ID - 45565
T2 - Lernen, Lehren und Forschen in einer digital geprägten Welt Gesellschaft für Didaktik der Chemie und Physik Jahrestagung in Aachen 2022
TI - Datenbasierte Fähigkeitsprofile im Physikdidaktischen Wissen
ER -
TY - CONF
AB - The nonlinear optical response of an ensemble of semiconductor quantum dots is analyzed by wave-mixing processes, where we focus on four-wave mixing with two incident pulses. Wave-mixing experiments are often described with semiclassical models, where the light is modeled classically and the material quantum mechanically. Here, however, we use a fully quantized model, where the light is given by a quantum state of light. Quantum light involves more degrees of freedom than classical light as e.g., its photon statistics and quantum correlations, which is a promising resource for quantum devices, such as quantum memories. The light-matter interaction is treated with a Jaynes-Cummings type model and the quantum field is given by a single mode since the quantum dots are embedded in a microcavity. We present numerical simulations of the four-wave-mixing response of a homogeneous system for pulse sequences and find a significant dependence of the result on the photon statistics of the incident pulses. The model constitutes a problem with a large state space which arises from the frequency distribution of the transition energies of the inhomogeneously broadened quantum dot ensemble that is coupled with a quantum light mode. Here we approximate the dynamics by summing over individual quantum dot-microcavity systems. Photon echoes arising from the excitation with different quantum states of light are simulated and compared.
AU - Rose, Hendrik
AU - Grisard, S.
AU - Trifonov, A. V.
AU - Reichhardt, R.
AU - Reichelt, Matthias
AU - Bayer, M.
AU - Akimov, I. A.
AU - Meier, Torsten
ID - 43192
T2 - Ultrafast Phenomena and Nanophotonics XXVII
TI - Theoretical analysis of four-wave mixing on semiconductor quantum dot ensembles with quantum light
VL - 12419
ER -
TY - JOUR
AB - Since high-order harmonic generation (HHG) from atoms depends sensitively on the polarization of the driving laser field, the polarization gating (PG) technique was developed and applied successfully to generate isolated attosecond pulses from atomic gases. The situation is, however, different in solid-state systems as it has been demonstrated that due to collisions with neighboring atomic cores of the crystal lattice strong HHG can be generated even by elliptically- and circularly-polarized laser fields. Here we apply PG to solid-state systems and find that the conventional PG technique is inefficient for the generation of isolated ultrashort harmonic pulse bursts. In contrast, we demonstrate that a polarization-skewed laser pulse is able to confine the harmonic emission to a time window of less than one-tenth of the laser cycle. This method provides a novel way to control HHG and to generate isolated attosecond pulses in solids.
AU - Song, Xiaohong
AU - Yang, Shidong
AU - Wang, Guifang
AU - Lin, Jianpeng
AU - Wang, Liang
AU - Meier, Torsten
AU - Yang, Weifeng
ID - 45704
IS - 12
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Control of the electron dynamics in solid-state high harmonic generation on ultrafast time scales by a polarization-skewed laser pulse
VL - 31
ER -
TY - JOUR
AU - Zuo, Ruixin
AU - Song, Xiaohong
AU - Ben, Shuai
AU - Meier, Torsten
AU - Yang, Weifeng
ID - 45703
IS - 2
JF - Physical Review Research
KW - General Physics and Astronomy
SN - 2643-1564
TI - Revealing the nonadiabatic tunneling dynamics in solid-state high harmonic generation
VL - 5
ER -
TY - JOUR
AU - Belobo, D. Belobo
AU - Meier, Torsten
ID - 45709
JF - Results in Physics
KW - General Physics and Astronomy
SN - 2211-3797
TI - Manipulation of nonautonomous nonlinear wave solutions of the generalized coupled Gross–Pitaevskii equations with spin–orbit interaction and weak Raman couplings
ER -
TY - CONF
AU - Abbas, Nilab
AU - Bauer, Anna Brigitte
AU - Reinhold, Peter
ED - van Vorst, Helena
ID - 45759
T2 - Lernen, Lehren und Forschen in einer digital geprägten Welt
TI - PSΦ: Entwicklung von Unterstützungsmaßnahmen für Theoretische Physik
ER -
TY - CONF
AU - Bauer, Anna Brigitte
AU - Reinhold, Peter
ED - van Vorst, Helena
ID - 45758
T2 - Lernen, Lehren und Forschen in einer digital geprägten Welt
TI - PSФ: Entwicklung einer abgestimmten Studieneingangsphase (Physik)
ER -
TY - JOUR
AB - A series of new organic donor–π–acceptor dyes incorporating a diquat moiety as a novel electron-acceptor unit have been synthesized and characterized. The analytical data were supported by DFT calculations. These dyes were explored in the aerobic thiocyanation of indoles and pyrroles. Here they showed a high photocatalytic activity under visible light, giving isolated yields of up to 97 %. In addition, the photocatalytic activity of standalone diquat and methyl viologen through formation of an electron donor acceptor complex is presented.
AU - Meier, Armin
AU - Badalov, Sabuhi
AU - Biktagirov, Timur
AU - Schmidt, Wolf Gero
AU - Wilhelm, René
ID - 43827
IS - 22
JF - Chemistry – A European Journal
KW - General Chemistry
KW - Catalysis
KW - Organic Chemistry
SN - 0947-6539
TI - Diquat Based Dyes: A New Class of Photoredox Catalysts and Their Use in Aerobic Thiocyanation
VL - 29
ER -
TY - JOUR
AB - Perfect vector vortex beams (PVVBs) have attracted considerable interest due to their peculiar optical features. PVVBs are typically generated through the superposition of perfect vortex beams, which suffer from the limited number of topological charges (TCs). Furthermore, dynamic control of PVVBs is desirable and has not been reported. We propose and experimentally demonstrate hybrid grafted perfect vector vortex beams (GPVVBs) and their dynamic control. Hybrid GPVVBs are generated through the superposition of grafted perfect vortex beams with a multifunctional metasurface. The generated hybrid GPVVBs possess spatially variant rates of polarization change due to the involvement of more TCs. Each hybrid GPVVB includes different GPVVBs in the same beam, adding more design flexibility. Moreover, these beams are dynamically controlled with a rotating half waveplate. The generated dynamic GPVVBs may find applications in the fields where dynamic control is in high demand, including optical encryption, dense data communication, and multiple particle manipulation.
AU - Ahmed, Hammad
AU - Ansari, Muhammad Afnan
AU - Li, Yan
AU - Zentgraf, Thomas
AU - Mehmood, Muhammad Qasim
AU - Chen, Xianzhong
ID - 45868
IS - 1
JF - Nature Communications
KW - General Physics and Astronomy
KW - General Biochemistry
KW - Genetics and Molecular Biology
KW - General Chemistry
KW - Multidisciplinary
SN - 2041-1723
TI - Dynamic control of hybrid grafted perfect vector vortex beams
VL - 14
ER -
TY - JOUR
AB - Interference between single photons is key for many quantum optics experiments and applications in quantum technologies, such as quantum communication or computation. It is advantageous to operate the systems at telecommunication wavelengths and to integrate the setups for these applications in order to improve stability, compactness and scalability. A new promising material platform for integrated quantum optics is lithium niobate on insulator (LNOI). Here, we realise Hong-Ou-Mandel (HOM) interference between telecom photons from an engineered parametric down-conversion source in an LNOI directional coupler. The coupler has been designed and fabricated in house and provides close to perfect balanced beam splitting. We obtain a raw HOM visibility of (93.5 ± 0.7) %, limited mainly by the source performance and in good agreement with off-chip measurements. This lays the foundation for more sophisticated quantum experiments in LNOI.
AU - Babel, Silia
AU - Bollmers, Laura
AU - Massaro, Marcello
AU - Luo, Kai Hong
AU - Stefszky, Michael
AU - Pegoraro, Federico
AU - Held, Philip
AU - Herrmann, Harald
AU - Eigner, Christof
AU - Brecht, Benjamin
AU - Padberg, Laura
AU - Silberhorn, Christine
ID - 45850
IS - 14
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Demonstration of Hong-Ou-Mandel interference in an LNOI directional coupler
VL - 31
ER -
TY - JOUR
AU - Bopp, Frederik
AU - Schall, Johannes
AU - Bart, Nikolai
AU - Vögl, Florian
AU - Cullip, Charlotte
AU - Sbresny, Friedrich
AU - Boos, Katarina
AU - Thalacker, Christopher
AU - Lienhart, Michelle
AU - Rodt, Sven
AU - Reuter, Dirk
AU - Ludwig, Arne
AU - Wieck, Andreas D.
AU - Reitzenstein, Stephan
AU - Müller, Kai
AU - Finley, Jonathan J.
ID - 46133
IS - 16
JF - Physical Review B
SN - 2469-9950
TI - Coherent driving of direct and indirect excitons in a quantum dot molecule
VL - 107
ER -
TY - JOUR
AU - Littmann, Mario
AU - Reuter, Dirk
AU - As, Donat Josef
ID - 46132
IS - 7
JF - physica status solidi (b)
KW - Condensed Matter Physics
KW - Electronic
KW - Optical and Magnetic Materials
SN - 0370-1972
TI - Remote Epitaxy of Cubic Gallium Nitride on Graphene‐Covered 3C‐SiC Substrates by Plasma‐Assisted Molecular Beam Epitaxy
VL - 260
ER -
TY - JOUR
AB - This work reports a fully guided setup for single-mode squeezing on integrated titanium-indiffused periodically poled nonlinear resonators. A continuous-wave laser beam is delivered and the squeezed field is collected by single-mode fibers; up to −3.17(9) dB of useful squeezing is available in fibers. To showcase the usefulness of such a fiber-coupled device, we applied the generated squeezed light in a fiber-based phase sensing experiment, showing a quantum enhancement in the signal-to-noise ratio of 0.35 dB. Moreover, our investigation of the effect of photorefraction on the cavity resonance condition suggests that it causes system instabilities at high powers.
AU - Domeneguetti, Renato
AU - Stefszky, Michael
AU - Herrmann, Harald
AU - Silberhorn, Christine
AU - Andersen, Ulrik L.
AU - Neergaard-Nielsen, Jonas S.
AU - Gehring, Tobias
ID - 46138
IS - 11
JF - Optics Letters
KW - Atomic and Molecular Physics
KW - and Optics
SN - 0146-9592
TI - Fully guided and phase locked Ti:PPLN waveguide squeezing for applications in quantum sensing
VL - 48
ER -
TY - JOUR
AB - Site-controlled Ga droplets on AlGaAs substrates are fabricated using area-selective deposition of Ga through apertures in a mask during molecular beam epitaxy (MBE). The Ga droplets can be crystallized into GaAs quantum dots using a crystallization step under As flux. In order to model the complex process, including the masked deposition of the droplets and a reduction of their number during a thermal annealing step, a multiscale kinetic Monte Carlo (mkMC) simulation of self-assembled Ga droplet formation on AlGaAs is expanded for area-selective deposition. The simulation has only two free model parameters: the activation energy for surface diffusion and the activation energy for thermal escape of adatoms from a droplet. Simulated droplet numbers within the opening of the aperture agree quantitatively with the experimental results down to the perfect site-control, with one droplet per aperture. However, the model parameters are different compared to those of the self-assembled droplet growth. We attribute this to the presence of the mask in close proximity to the surface, which modifies the local process temperature and the As background. This approach also explains the dependence of the model parameters on the size of the aperture.
AU - Feddersen, Stefan
AU - Zolatanosha, Viktoryia
AU - Alshaikh, Ahmed
AU - Reuter, Dirk
AU - Heyn, Christian
ID - 46278
IS - 3
JF - Nanomaterials
KW - General Materials Science
KW - General Chemical Engineering
SN - 2079-4991
TI - Modeling of Masked Droplet Deposition for Site-Controlled Ga Droplets
VL - 13
ER -
TY - JOUR
AU - Lange, Nina Amelie
AU - Schapeler, Timon
AU - Höpker, Jan Philipp
AU - Protte, Maximilian
AU - Bartley, Tim
ID - 46468
IS - 2
JF - Physical Review A
SN - 2469-9926
TI - Degenerate photons from a cryogenic spontaneous parametric down-conversion source
VL - 108
ER -
TY - CONF
AB - We present a miniaturized pulse shaping device that creates an arbitrary dispersion through the interaction of multiple metasurfaces on less than 2 mm3 volume. For this, a metalens and a grating-metasurface between two silver mirrors are fabricated. The grating contains further phase information to achieve the device's pulse shaping functionality.
AU - Geromel, René
AU - Georgi, Philip
AU - Protte, Maximilian
AU - Bartley, Tim
AU - Huang, Lingling
AU - Zentgraf, Thomas
ID - 46485
T2 - CLEO: Fundamental Science 2023
TI - Dispersion control with integrated plasmonic metasurfaces
ER -
TY - JOUR
AB - We present the fabrication of strain-free quantum dots in the In0.53Ga0.47As/In0.52Al0.48As-system lattice matched to InP, as future sources for single and entangled photons for long-haul fiber-based quantum communication in the optical C-band. We achieved these quantum dots by local droplet etching via InAl droplets in an In0.52Al0.48As layer and subsequent filling of the holes with In0.53Ga0.47As. Here, we present detailed investigations of the hole morphologies measured by atomic force microscopy. Statistical analysis of a set of nanoholes reveals a high degree of symmetry for nearly half of them when etched at optimized temperatures. Overgrowth with 50–150 nm In0.52Al0.48As increases their diameter and elongates the holes along the [01̄1]-direction. By systematically scanning the parameter space, we were able to fill the holes with In0.53Ga0.47As, and by capping the filled holes and performing photoluminescence measurements, we observe photoluminescence emission in the O-band up into the C-band depending on the filling height of the nanoholes.
AU - Deutsch, D.
AU - Buchholz, C.
AU - Zolatanosha, V.
AU - Jöns, K. D.
AU - Reuter, D.
ID - 44851
IS - 5
JF - AIP Advances
KW - General Physics and Astronomy
SN - 2158-3226
TI - Telecom C-band photon emission from (In,Ga)As quantum dots generated by filling nanoholes in In0.52Al0.48As layers
VL - 13
ER -
TY - CONF
AU - Elsner, Julia
AU - Tenberge, Claudia
AU - Fechner, Sabine
ED - van Vorst, Helena
ID - 45371
T2 - Lernen, Lehren und Forschen in einer digital geprägten Welt
TI - Videoanalyse des Modellierprozesses von Grundschüler*innen
VL - 43
ER -
TY - JOUR
AU - Zscherp, Mario Fabian
AU - Jentsch, Silas Aurel
AU - Müller, Marius Johannes
AU - Lider, Vitalii
AU - Becker, Celina
AU - Chen, Limei
AU - Littmann, Mario
AU - Meier, Falco
AU - Beyer, Andreas
AU - Hofmann, Detlev Michael
AU - As, Donat Josef
AU - Klar, Peter Jens
AU - Volz, Kerstin
AU - Chatterjee, Sangam
AU - Schörmann, Jörg
ID - 46741
IS - 33
JF - ACS Applied Materials & Interfaces
KW - General Materials Science
SN - 1944-8244
TI - Overcoming the Miscibility Gap of GaN/InN in MBE Growth of Cubic InxGa1–xN
VL - 15
ER -
TY - JOUR
AU - Schubatzky, Thomas
AU - Burde, Jan-Philipp
AU - Große-Heilmann, Rike Isabel
AU - Haagen-Schützenhöfer, Claudia
AU - Riese, Josef
AU - Weiler, David
ID - 47085
JF - Computers & Education
KW - Education
KW - General Computer Science
SN - 0360-1315
TI - Predicting the development of digital media PCK/TPACK: The role of PCK, motivation to use digital media, interest in and previous experience with digital media
VL - 206
ER -
TY - JOUR
AU - Zhai, Xiaokun
AU - Ma, Xuekai
AU - Gao, Ying
AU - Xing, Chunzi
AU - Gao, Meini
AU - Dai, Haitao
AU - Wang, Xiao
AU - Pan, Anlian
AU - Schumacher, Stefan
AU - Gao, Tingge
ID - 40274
IS - 13
JF - Physical Review Letters
TI - Electrically controlling vortices in a neutral exciton polariton condensate at room temperature
VL - 131
ER -
TY - GEN
AB - In planar microcavities, the transverse-electric and transverse-magnetic
(TE-TM) mode splitting of cavity photons arises due to their different
penetration into the Bragg mirrors and can result in optical spin-orbit
coupling (SOC). In this work, we find that in a liquid crystal (LC) microcavity
filled with perovskite microplates, the pronounced TE-TM splitting gives rise
to a strong SOC that leads to the spatial instability of microcavity polariton
condensates under single-shot excitation. Spatially varying hole burning and
mode competition occurs between polarization components leading to different
condensate profiles from shot to shot. The single-shot polariton condensates
become stable when the SOC vanishes as the TE and TM modes are spectrally well
separated from each other, which can be achieved by application of an electric
field to our LC microcavity with electrically tunable anisotropy. Our findings
are well reproduced and traced back to their physical origin by our detailed
numerical simulations. With the electrical manipulation our work reveals how
the shot-to-shot spatial instability of spatial polariton profiles can be
engineered in anisotropic microcavities at room temperature, which will benefit
the development of stable polariton-based optoeletronic and light-emitting
devices.
AU - Gao, Ying
AU - Ma, Xuekai
AU - Zhai, Xiaokun
AU - Xing, Chunzi
AU - Gao, Meini
AU - Dai, Haitao
AU - Wu, Hao
AU - Liu, Tong
AU - Ren, Yuan
AU - Wang, Xiao
AU - Pan, Anlian
AU - Hu, Wei
AU - Schumacher, Stefan
AU - Gao, Tingge
ID - 47532
T2 - arXiv:2305.01368
TI - Single-shot spatial instability and electric control of polariton
condensates at room temperature
ER -
TY - GEN
AB - The control and active manipulation of spin-orbit coupling (SOC) in photonic
systems is fundamental in the development of modern spin optics and topological
photonic devices. Here, we demonstrate the control of an artificial
Rashba-Dresselhaus (RD) SOC mediated by photochemical reactions in a
microcavity filled with an organic single-crystal of photochromic phase-change
character. Splitting of the circular polarization components of the optical
modes induced by photonic RD SOC is observed experimentally in momentum space.
By applying an ultraviolet light beam, we control the spatial molecular
orientation through a photochemical reaction and with that we control the
energies of the photonic modes. This way we realize a reversible conversion of
spin-splitting of the optical modes with different energies, leading to an
optically controlled switching between circularly and linearly polarized
emission from our device. Our strategy of in situ and reversible engineering of
SOC induced by a light field provides a promising approach to actively design
and manipulate synthetic gauge fields towards future on-chip integration in
photonics and topological photonic devices.
AU - Liang, Qian
AU - Ma, Xuekai
AU - Ren, Jiahuan
AU - Long, Teng
AU - Gu, Chunling
AU - An, Cunbin
AU - Fu, Hongbing
AU - Schumacher, Stefan
AU - Liao, Qing
ID - 47533
T2 - arXiv:2309.07652
TI - Photochemical reaction enabling the engineering of photonic spin-orbit
coupling in organic-crystal optical microcavities
ER -
TY - GEN
AB - Topological states have been widely investigated in different types of
systems and lattices. In the present work, we report on topological edge states
in double-wave (DW) chains, which can be described by a generalized
Aubry-Andr\'e-Harper (AAH) model. For the specific system of a
driven-dissipative exciton polariton system we show that in such potential
chains, different types of edge states can form. For resonant optical
excitation, we further find that the optical nonlinearity leads to a
multistability of different edge states. This includes topologically protected
edge states evolved directly from individual linear eigenstates as well as
additional edge states that originate from nonlinearity-induced localization of
bulk states. Extending the system into two dimensions (2D) by stacking
horizontal DW chains in the vertical direction, we also create 2D multi-wave
lattices. In such 2D lattices multiple Su-Schrieffer-Heeger (SSH) chains appear
along the vertical direction. The combination of DW chains in the horizontal
and SSH chains in the vertical direction then results in the formation of
higher-order topological insulator corner states.
AU - Schneider, Tobias
AU - Gao, Wenlong
AU - Zentgraf, Thomas
AU - Schumacher, Stefan
AU - Ma, Xuekai
ID - 47531
T2 - arXiv:2303.12593
TI - Topological edge and corner states in coupled wave lattices in nonlinear polariton condensates
ER -
TY - GEN
AB - Exceptional points (EPs) with their intriguing spectral topology have
attracted considerable attention in a broad range of physical systems, with
potential sensing applications driving much of the present research in this
field. Here we theoretically demonstrate the realization of EPs in a system
with significant nonlinearity, a non-equilibrium exciton-polariton condensate.
With the possibility to control loss and gain and nonlinearity by optical
means, this system allows for a comprehensive analysis of the interplay of
nonlinearities (Kerr-type and saturable gain) and non-Hermiticity. Not only do
we find that EPs can be intentionally shifted in parameter space by the
saturable gain, we also observe intriguing rotations and intersections of
Riemann surfaces, and find nonlinearity-enhanced sensing capabilities. Our
results are quite general in nature and illustrate the potential of tailoring
spectral topology and related phenomena in non-Hermitian systems by
nonlinearity.
AU - Wingenbach, Jan
AU - Schumacher, Stefan
AU - Ma, Xuekai
ID - 47529
T2 - arXiv:2305.04855
TI - Tweaking Spectral Topology and Exceptional Points by Nonlinearity in
Non-Hermitian Polariton Systems
ER -
TY - CHAP
AU - Zentgraf, Thomas
ED - Panoiu, Nicoae C.
ID - 47543
SN - 978-0-323-90614-2
T2 - Fundamentals and Applications of Nonlinear Nanophotonics
TI - Symmetry governed nonlinear selection rules in nanophotonics
ER -
TY - JOUR
AU - Tenberge, Claudia
ID - 47868
JF - Grundschule Sachunterricht
TI - Ungeliebte Tiere in der Stadt
VL - 98
ER -
TY - BOOK
ED - ija Grigorjevaite, Kadri Mettis, Katarina Stekic, Kristof Van de Keere, Marjana Brkic, Michael Lenke, Mikko-Jussi Laakso, Paulius Lukas Tamošiūnas, Sofia Karlsson, Sven Hüsing, Jurga Turčinavičienė, Violeta Šlekienė, Mart Laanpere, and Vidita Urboniene
ID - 47885
TI - A PRACTICAL HANDBOOK ON EFFECTIVE DEVELOPMENT AND IMPLEMENTATION OF STEAM TEACHING AT SCHOOL
ER -
TY - CHAP
AU - Schröer, Franz
AU - Tenberge, Claudia
ED - Wooff, D. , McLain, M.
ID - 47886
T2 - Bloomsbury Handbook of Technology Education.
TI - Inclusion and the Development of Technology Education - Thinking towards an inclusive curriculum for technology education in German primary schools
ER -
TY - CONF
AU - Jordans, Melanie
AU - Riese, Josef
ED - van Vorst, Helena
ID - 48633
T2 - Lernen, Lehren und Forschen in einer digital geprägten Welt. Gesellschaft für Didaktik der Chemie und Physik. Jahrestagung in Aachen 2022
TI - Unterrichtsplanung mit sinnvoller Einbettung digitaler Medien im PU
ER -
TY - JOUR
AB - An ultra-fast change of the absorption onset for zincblende gallium-nitride (zb-GaN) (fundamental bandgap: 3.23 eV) is observed by investigating the imaginary part of the dielectric function using time-dependent femtosecond pump–probe spectroscopic ellipsometry between 2.9 and 3.7 eV. The 266 nm (4.66 eV) pump pulses induce a large electron–hole pair concentration up to 4×1020cm−3, which shift the transition energy between conduction and valence bands due to many-body effects up to ≈500 meV. Here, the absorption onset increases due to band filling while the bandgap renormalization at the same time decreases the bandgap. Additionally, the absorption of the pump-beam creates a free-carrier profile within the 605 nm zb-GaN layer with high free-carrier concentrations at the surface, and low concentrations at the interface to the substrate. This leads to varying optical properties from the sample surface (high transition energy) to substrate (low transition energy), which are taken into account by grading analysis for an accurate description of the experimental data. For this, a model describing the time- and position-dependent free-carrier concentration is formulated by considering the relaxation, recombination, and diffusion of those carriers. We provide a quantitative analysis of optical experimental data (ellipsometric angles Ψ and Δ) as well as a plot for the time-dependent change of the imaginary part of the dielectric function.
AU - Baron, Elias
AU - Goldhahn, Rüdiger
AU - Espinoza, Shirly
AU - Zahradník, Martin
AU - Rebarz, Mateusz
AU - Andreasson, Jakob
AU - Deppe, Michael
AU - As, Donat Josef
AU - Feneberg, Martin
ID - 46573
IS - 7
JF - Journal of Applied Physics
KW - General Physics and Astronomy
SN - 0021-8979
TI - Time-resolved pump–probe spectroscopic ellipsometry of cubic GaN. I. Determination of the dielectric function
VL - 134
ER -
TY - JOUR
AB - The crystal family of potassium titanyl phosphate (KTiOPO4) is a promising material group for applications in quantum and nonlinear optics. The fabrication of low-loss optical waveguides, as well as high-grade periodically poled ferroelectric domain structures, requires a profound understanding of the material properties and crystal structure. In this regard, Raman spectroscopy offers the possibility to study and visualize domain structures, strain, defects, and the local stoichiometry, which are all factors impacting device performance. However, the accurate interpretation of Raman spectra and their changes with respect to extrinsic and intrinsic defects requires a thorough assignment of the Raman modes to their respective crystal features, which to date is only partly conducted based on phenomenological modelling. To address this issue, we calculated the phonon spectra of potassium titanyl phosphate and the related compounds rubidium titanyl phosphate (RbTiOPO4) and potassium titanyl arsenate (KTiOAsO4) based on density functional theory and compared them with experimental data. Overall, this allows us to assign various spectral features to eigenmodes of lattice substructures with improved detail compared to previous assignments. Nevertheless, the analysis also shows that not all features of the spectra can unambigiously be explained yet. A possible explanation might be that defects or long range fields not included in the modeling play a crucial rule for the resulting Raman spectrum. In conclusion, this work provides an improved foundation into the vibrational properties in the KTiOPO4 material family.
AU - Neufeld, Sergej
AU - Gerstmann, Uwe
AU - Padberg, Laura
AU - Eigner, Christof
AU - Berth, Gerhard
AU - Silberhorn, Christine
AU - Eng, Lukas M.
AU - Schmidt, Wolf Gero
AU - Rüsing, Michael
ID - 47997
IS - 10
JF - Crystals
KW - Inorganic Chemistry
KW - Condensed Matter Physics
KW - General Materials Science
KW - General Chemical Engineering
SN - 2073-4352
TI - Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family
VL - 13
ER -
TY - JOUR
AB - We report a titanium indiffused waveguide resonator featuring an integrated electro-optic modulator for cavity length stabilisation that produces close to 5 dB of squeezed light at 1550 nm (2.4 dB directly measured). The resonator is locked on resonance for tens of minutes with 70 mW of SH light incident on the cavity, demonstrating that photorefraction can be mitigated. Squeezed light production concurrent with cavity length stabilisation utilising the integrated EOM is demonstrated. The device demonstrates the suitability of this platform for squeezed light generation in network applications, where stabilisation to the reference field is typically necessary.
AU - Stefszky, M.
AU - vom Bruch, F.
AU - Santandrea, M.
AU - Ricken, R.
AU - Quiring, V.
AU - Eigner, C.
AU - Herrmann, H
AU - Silberhorn, C
ID - 48349
IS - 21
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Lithium niobate waveguide squeezer with integrated cavity length stabilisation for network applications
VL - 31
ER -
TY - JOUR
AU - Gao, Ying
AU - Ma, Xuekai
AU - Zhai, Xiaokun
AU - Xing, Chunzi
AU - Gao, Meini
AU - Dai, Haitao
AU - Wu, Hao
AU - Liu, Tong
AU - Ren, Yuan
AU - Wang, Xiao
AU - Pan, Anlian
AU - Hu, Wei
AU - Schumacher, Stefan
AU - Gao, Tingge
ID - 48774
IS - 20
JF - Physical Review B
SN - 2469-9950
TI - Single-shot spatial instability and electric control of polariton condensates at room temperature
VL - 108
ER -
TY - JOUR
AU - Ali, Usman
AU - Holthaus, Martin
AU - Meier, Torsten
ID - 49059
IS - 4
JF - Physical Review Research
KW - General Physics and Astronomy
SN - 2643-1564
TI - Chirped Bloch-harmonic oscillations in a parametrically forced optical lattice
VL - 5
ER -
TY - JOUR
AU - Scharwald, D.
AU - Meier, T.
AU - Sharapova, P. R.
ID - 49117
IS - 4
JF - Physical Review Research
KW - General Physics and Astronomy
SN - 2643-1564
TI - Phase sensitivity of spatially broadband high-gain SU(1,1) interferometers
VL - 5
ER -
TY - CHAP
AU - Bürger, Julius
AU - Lindner, Jörg K. N.
ED - Bürger, Julius
ID - 46980
SN - 978-3-8376-6377-8
T2 - Climate Protection, Resource Efficiency, and Sustainable Mobility - Transdisciplinary Approaches to Design and Manufacturing Technology
TI - Transmission electron microscopy and transdisciplinary research
ER -
TY - CHAP
AU - Bürger, Julius
AU - Lindner, Jörg K. N.
ID - 47133
SN - 978-3-8376-6377-8
T2 - Climate Protection, Resource Efficiency, and Sustainable Mobility - Transdisciplinary Approaches to Design and Manufacturing Technology
TI - Transmission electron microscopy and transdisciplinary research
ER -
TY - CHAP
AU - Bürger, Julius
AU - Lindner, Jörg K. N.
ID - 47123
SN - 978-3-8376-6377-8
T2 - Climate Protection, Resource Efficiency, and Sustainable Mobility - Transdisciplinary Approaches to Design and Manufacturing Technology
TI - Transmission electron microscopy and transdisciplinary research
ER -
TY - GEN
ED - Lindner, Jörg
ED - Brassat, Katharina
ID - 49367
SN - ISSN 2073-4360
T2 - Polymers
TI - Self-Assembled Block Copolymer Thin Films and Their Applications
ER -
TY - JOUR
AB - In this work, we utilize thin dielectric meta-atoms placed on a silver substrate to efficiently enhance and manipulate the third-harmonic generation. We theoretically and experimentally reveal that when the structural symmetry of the meta-atom is incompatible with the lattice symmetry of an array, some generalized nonlinear geometric phases appear, which offers new possibilities for harmonic generation control beyond the accessible symmetries governed by the selection rule. The underlying mechanism is attributed to the modified rotation of the effective principal axis of a dense meta-atom array, where the strong coupling among the units gives rise to a generalized linear geometric phase modulation of the pump light. Therefore, nonlinear geometric phases carried by third-harmonic emissions are the natural result of the wave-mixing process among the modes excited at the fundamental frequency. This mechanism further points out a new strategy to predict the nonlinear geometric phases delivered by the nanostructures according to their linear responses. Our design is simple and efficient and offers alternatives for the nonlinear meta-devices that are capable of flexible photon generation and manipulation.
AU - Liu, Bingyi
AU - Geromel, René
AU - Su, Zhaoxian
AU - Guo, Kai
AU - Wang, Yongtian
AU - Guo, Zhongyi
AU - Huang, Lingling
AU - Zentgraf, Thomas
ID - 49607
JF - ACS Photonics
KW - Electrical and Electronic Engineering
KW - Atomic and Molecular Physics
KW - and Optics
KW - Biotechnology
KW - Electronic
KW - Optical and Magnetic Materials
SN - 2330-4022
TI - Nonlinear Dielectric Geometric-Phase Metasurface with Simultaneous Structure and Lattice Symmetry Design
ER -
TY - JOUR
AU - Ruiz Alvarado, Isaac Azahel
AU - Zare Pour, Mohammad Amin
AU - Hannappel, Thomas
AU - Schmidt, Wolf Gero
ID - 49634
IS - 4
JF - Physical Review B
SN - 2469-9950
TI - Structural fingerprints in the reflectance anisotropy of AlInP(001)
VL - 108
ER -
TY - GEN
AB - The biexciton-exciton emission cascade commonly used in quantum-dot systems to generate polarization entanglement yields photons with intrinsically limited indistinguishability. In the present work we focus on the generation of pairs of photons with high degrees of polarization entanglement and simultaneously high indistinguishibility. We achieve this goal by selectively reducing the biexciton lifetime with an optical resonator. We demonstrate that a suitably tailored circular Bragg reflector fulfills the requirements of sufficient selective Purcell enhancement of biexciton emission paired with spectrally broad photon extraction and two-fold degenerate optical modes. Our in-depth theoretical study combines (i) the optimization of realistic photonic structures solving Maxwell's equations from which model parameters are extracted as input for (ii) microscopic simulations of quantum-dot cavity excitation dynamics with full access to photon properties. We report non-trivial dependencies on system parameters and use the predictive power of our combined theoretical approach to determine the optimal range of Purcell enhancement that maximizes indistinguishability and entanglement to near unity values in the telecom C-band at $1550\,\mathrm{nm}$.
AU - Bauch, David
AU - Siebert, Dustin
AU - Jöns, Klaus
AU - Förstner, Jens
AU - Schumacher, Stefan
ID - 43246
KW - tet_topic_phc
KW - tet_topic_qd
TI - On-demand indistinguishable and entangled photons at telecom frequencies using tailored cavity designs
ER -
TY - JOUR
AU - Ali, Usman
AU - Holthaus, Martin
AU - Meier, Torsten
ID - 52122
IS - 4
JF - Physical Review Research
KW - General Physics and Astronomy
SN - 2643-1564
TI - Chirped Bloch-harmonic oscillations in a parametrically forced optical lattice
VL - 5
ER -
TY - DATA
AU - Meier, Torsten
ID - 52124
TI - Chirped Bloch-harmonic oscillations in a parametrically forced optical lattice
ER -
TY - JOUR
AU - Diederich, Malte
AU - Spatz, Verena
AU - Bauer, Anna Brigitte
ID - 52358
JF - Phydid B, Didaktik der Physik, Beiträge zur DPG-Frühjahrstagung (2022)
TI - Auswirkungen einer Online-Intervention (Mindset, Lerntechniken) auf den Studieneinstieg
ER -
TY - JOUR
AU - Widhalm, Alex
AU - Golla, Christian
AU - Weber, Nils
AU - Mackwitz, Peter
AU - Zrenner, Artur
AU - Meier, Cedrik
ID - 29716
IS - 4
JF - Optics Express
KW - Atomic and Molecular Physics
KW - and Optics
SN - 1094-4087
TI - Electric-field-induced second harmonic generation in silicon dioxide
VL - 30
ER -