Article
Materials Science, Multidisciplinary
Tomohiro Ishii, Kiyoshi Miyata, Masashi Mamada, Fatima Bencheikh, Fabrice Mathevet, Ken Onda, Stephane Kena-Cohen, Chihaya Adachi
Summary: In organic microcavities, a room-temperature polariton condensate is demonstrated with a low threshold pump fluence, attributed to the rapid relaxation rate from the dark exciton reservoir to the LP states forming the condensate. These results highlight the importance of accelerating polariton relaxation in achieving low-threshold polariton condensates.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Krzysztof Sawicki, Thomas J. Sturges, Maciej Sciesiek, Tomasz Kazimierczuk, Kamil Sobczak, Andrzej Golnik, Wojciech Pacuski, Jan Suffczynski
Summary: Multi-level exciton-polariton systems are studied for non-linear optical phenomena, with a focus on non-equilibrium Bose-Einstein condensation and low threshold, dual-wavelength polariton lasing in vertically coupled planar microcavities. The presence of non-resonantly driven condensate triggers interbranch exciton-polariton transfer. The inherent tunability of the platform holds promise for constructing planar lattices and enabling three-dimensional polariton hopping and photonic devices.
Article
Multidisciplinary Sciences
Xiaofei Xiao, Jinyou Lu, Fatima Alzaabi, Mahra Almheiri, Vincenzo Giannini, Tadzio Levato
Summary: This work proposes a simple and computationally inexpensive method for designing broadband polarization conversion metasurfaces. By decomposing the system and selecting proper parameters, a metasurface with a relative bandwidth of 97% for converting linearly polarized waves to cross-polarized waves is designed. The method significantly reduces computational expense and can be easily extended to complex structures.
SCIENTIFIC REPORTS
(2023)
Article
Nanoscience & Nanotechnology
Elena Rozas, Alexey Yulin, Johannes Beierlein, Sebastian Klembt, Sven Hofling, Oleg Egorov, Ulf Peschel, I. A. Shelykh, Manuel Gundin, Ignacio Robles-Lopez, M. D. Martin, L. Vina
Summary: The study reveals a preferential orientation of linear polarization and polarization-dependent intensity oscillations in polariton condensates in a codirectional coupler, highlighting the control and potential development of spin-based polaritonic architectures for macroscopic propagation of condensates.
Article
Multidisciplinary Sciences
Yi Feng, Di Li, Yuan-Pei Yang, Yongkun Zhang, Weiwei Zhu, Bing Zhang, Wenbin Lu, Pei Wang, Shi Dai, Ryan S. Lynch, Jumei Yao, Jinchen Jiang, Jiarui Niu, Dejiang Zhou, Heng Xu, Chenchen Miao, Chenhui Niu, Lingqi Meng, Lei Qian, Chao-Wei Tsai, Bojun Wang, Mengyao Xue, Youling Yue, Mao Yuan, Songbo Zhang, Lei Zhang
Summary: Observations of five repeating FRBs revealed a trend of lower polarization at lower frequencies. This behavior can be modeled as multipath scattering, characterized by the rotation measure (RM) scatter. Sources with higher RM scatter have higher RM magnitude and scattering time scales. Furthermore, the two sources with the highest RM scatter are associated with compact persistent radio sources.
Article
Astronomy & Astrophysics
Pravir Kumar, Ryan M. Shannon, Marcus E. Lower, Adam T. Deller, J. Xavier Prochaska
Summary: The study of impulsive astrophysical radio emission allows us to investigate the plasma between the emission source and the Earth. The circular propagating wave modes in cold electron-ion plasmas affect the linear polarization plane, while in relativistic plasmas, the wave modes can convert linearly polarized emission into circular and vice versa. Fast radio bursts (FRBs) provide an opportunity to study the intergalactic and magneto-ionic medium. This article presents the polarimetric analysis of a repeat burst from the FRB 20201124A source, which displays a unique frequency-dependent circular polarization. The observed circular polarization can be explained by the propagation of a linearly polarized burst signal through a relativistic plasma along the line of sight from the progenitor.
Article
Multidisciplinary Sciences
Aykut Coskun, Ugur Cem Hasar, Ahmet Ozmen, Mehmet Ertugrul
Summary: This article presents a design of an ultrathin, broadband, and multipurpose polarization converter for K and Ka band using an anisotropic metasurface. The proposed converter can convert both circular polarization and linear polarization to circular polarization, with a polarization conversion rate of over 90% in the frequency range from 17.87 to 43.15 GHz, covering all K and Ka bands.
ADVANCED THEORY AND SIMULATIONS
(2022)
Article
Optics
Baoqin Lin, Wenzhun Huang, Jianxin Guo, Yanwei Wang, Zhe Liu, Hongjun Ye
Summary: In this work, an 8-shaped metasurface is proposed for circular-to-linear (CTL) polarization conversion. It has an appropriate anisotropy that allows for close to +90 degrees reflection phase difference in an ultra-wide frequency range. Numerical simulated and experimental results demonstrate the efficiency and accuracy of the proposed metasurface in achieving ultra-wideband CTL polarization conversion.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Yuanyuan Bai, Chunmei Ouyang, Shoujun Zhang, Zhibo Yao, Kuan Liu, Shilei Liu, Jiajun Ma, Yanfeng Li, Tun Cao, Zhen Tian
Summary: In this study, an actively controllable GST-based metamaterial device is proposed and demonstrated, where the functionality is experimentally verified by inducing the crystallization process with thermal activation. Cross-polarization conversion in the reflection mode and circular-to-linear polarization conversion in the transmission mode are achieved under crystalline and amorphous GST conditions, respectively.
Article
Physics, Applied
A. A. Demenev, D. D. Yaremkevich, A. V. Scherbakov, S. S. Gavrilov, D. R. Yakovlev, V. D. Kulakovskii, M. Bayer
Summary: This study investigates the all-optical switching of exciton polaritons by using a picosecond acoustic perturbation. By injecting a strain pulse generated by a high-energy laser into the microcavity, the energy of the exciton can be instantly altered, resulting in a polarization switch.
PHYSICAL REVIEW APPLIED
(2022)
Article
Materials Science, Multidisciplinary
Ayesha Kosar Fahad, Cunjun Ruan, Rabia Nazir, Muhammad Taskeen Raza
Summary: This work demonstrates the design, fabrication, and experimental verification of a triple band linear to circular polarization converter operating multiple functions of transmission and reflection. The device, based on a single substrate-layered metasurfaces structure, performs linear to circular polarization conversion in the frequency ranges of 12.95-14.85 GHz, 24.89-32.75 GHz, and 44.9-52.5 GHz for transmission, and 13.32-15.6 GHz, 26.5-32.6 GHz, and 45.85-53.5 GHz for reflection.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Yongzhi Cheng, Jinxiu Wang
Summary: This paper presents a tunable terahertz circular-polarization (CP) convertor based on graphene metamaterial, which can achieve high efficiency polarization conversion at specific Fermi energy levels and be continuously adjusted for various applications.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Computer Science, Information Systems
Fengan Li, Baiqiang You
Summary: This paper presents a metasurface composed of complementary units that can achieve orthogonal linear and linear-to-circular polarization conversion in multiple frequency bands. The research results demonstrate that polarization conversion can be achieved in both high-conversion frequency bands and frequency bands with axial ratios less than 3 dB.
Article
Multidisciplinary Sciences
H. Xu, J. R. Niu, P. Chen, K. J. Lee, W. W. Zhu, S. Dong, B. Zhang, J. C. Jiang, B. J. Wang, J. W. Xu, C. F. Zhang, H. Fu, A. Filippenko, E. W. Peng, D. J. Zhou, Y. K. Zhang, P. Wang, Y. Feng, Y. Li, T. G. Brink, D. Z. Li, W. Lu, Y. P. Yang, R. N. Caballero, C. Cai, M. Z. Chen, Z. G. Dai, S. G. Djorgovski, A. Esamdin, H. Q. Gan, P. Guhathakurta, J. L. Han, L. F. Hao, Y. X. Huang, P. Jiang, C. K. Li, D. Li, H. Li, X. Q. Li, Z. X. Li, Z. Y. Liu, R. Luo, Y. P. Men, C. H. Niu, W. X. Peng, L. Qian, L. M. Song, D. Stern, A. Stockton, J. H. Sun, F. Y. Wang, M. Wang, N. Wang, W. Y. Wang, X. F. Wu, S. Xiao, S. L. Xiong, Y. H. Xu, R. X. Xu, J. Yang, X. Yang, R. Yao, Q. B. Yi, Y. L. Yue, D. J. Yu, W. F. Yu, J. P. Yuan, B. B. Zhang, S. B. Zhang, S. N. Zhang, Y. Zhao, W. K. Zheng, Y. Zhu, J. H. Zou
Summary: This study reports the continuous observations of FRB 20201124A, revealing the irregular time variation and circular polarization of its radio bursts. These features provide evidence for the immediate environment around the source and its location in a low-stellar-density interarm region at the center of the galaxy. This finding is significant for understanding the origin of cosmological FRBs.
Article
Chemistry, Multidisciplinary
Wei Wang, Guang Lu, Chao Diao, Junyang Li, Fen Liu, Guiqiang Du
Summary: We propose a specific subwavelength-cavity high-gain circularly polarized ultra-thin antenna made of planar metamaterials. The antenna is designed to operate at 2.80 GHz with a fixed thickness of approximately 1/6 of the operating wavelength in free space. This new subwavelength planar antenna can have potential applications in communication, early warning systems, and radio observation.
APPLIED SCIENCES-BASEL
(2023)
Article
Physics, Multidisciplinary
Bo Li, Yuan Cao, Yu-Huai Li, Wen-Qi Cai, Wei-Yue Liu, Ji-Gang Ren, Sheng-Kai Liao, Hui-Nan Wu, Shuang-Lin Li, Li Li, Nai-Le Liu, Chao-Yang Lu, Juan Yin, Yu-Ao Chen, Cheng-Zhi Peng, Jian-Wei Pan
Summary: Long-distance quantum state transfer is a core element of important quantum protocols, but implementing Bell-state measurement after photon propagation in atmospheric channels is challenging due to atmospheric turbulence. By developing a stable interferometer and utilizing a satellite-borne entangled photon source, proof-of-principle QST was demonstrated at a distance of over 1200 km with an average fidelity of 0.82±0.01.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Rafaela F. S. Penacchio, Celso Fornari, Yori G. Camillo, Philipp Kagerer, Sebastian Buchberger, Martin Kamp, Hendrik Bentmann, Friedrich Reinert, Sergio L. Morelhao
Summary: Van der Waals (vdW) materials play a fundamental role in emerging technologies such as spintronics and quantum information processing. This study describes a statistical modeling method for simulating X-ray diffraction in disordered materials, which is essential for controlling the epitaxial growth of topological insulators with intrinsic magnetic properties.
Correction
Optics
A. Schlager, M. Goetsch, R. J. Chapman, S. Frick, H. Thiel, H. Suchomel, M. Kamp, S. Hoefling, C. Schneider, G. Weihs
Article
Multidisciplinary Sciences
Hangyong Shan, Ivan Iorsh, Bo Han, Christoph Rupprecht, Heiko Knopf, Falk Eilenberger, Martin Esmann, Kentaro Yumigeta, Kenji Watanabe, Takashi Taniguchi, Sebastian Klembt, Sven Hoefling, Sefaattin Tongay, Carlos Anton-Solanas, Ivan A. Shelykh, Christian Schneider
Summary: Engineering the properties of quantum materials via strong light-matter coupling is an important direction of research with diverse modern applications. This study demonstrates the brightening of dark excitons in a monolayer of WSe2 through strong coupling, preventing the commonly observed photoluminescence quenching.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Florian Rothmayr, Edgar David Guarin Castro, Fabian Hartmann, Georg Knebl, Anne Schade, Sven Hoefling, Johannes Koeth, Andreas Pfenning, Lukas Worschech, Victor Lopez-Richard
Summary: Resonant tunneling diode photodetectors show promise for mid-infrared sensing at room temperature due to their simple design. We fabricated devices with GalnAsSb absorbers and achieved significant electrical responsivity. This paper provides a comprehensive theoretical analysis of the sensor's functionality and performance, including the effects of photogenerated carriers on electrostatic modulation and the control of sensing abilities.
Article
Crystallography
N. Liu, S. Schreyeck, K. M. Fijalkowski, M. Kamp, K. Brunner, C. Gould, L. W. Molenkamp
Summary: This study successfully grew high-quality MnBi2Te4 films with nearly perfect septuple-layer structure using molecular beam epitaxy on Si(1 1 1). The films exhibit antiferromagnetic order with a Neel temperature of 19 K, a spin-flop transition at a magnetic field of 2.5 T, and a resistivity of 1.6 mΩ·cm.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Optics
Josephine Nauschuetz, Hedwig Knoetig, Robert Weih, Julian Scheuermann, Johannes Koeth, Sven Hoefling, Benedikt Schwarz
Summary: This article presents GaSb-based interband cascade lasers (ICLs) operating at a center wavelength of 6.12 μm in continuous-wave mode up to a maximum temperature of 40 °C. The performance of the devices is improved by adjusting the Ga1-xInxSb layer thickness in the active region to reduce valence intersubband absorption. The optimization of the device design and electron injector rebalances the electron and hole concentrations, resulting in low threshold current densities and power consumption, making them suitable for mobile and compact sensing systems.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Jonathan Jurkat, Sebastian Klembt, Marco De Gregorio, Moritz Meinecke, Quirin Buchinger, Tristan H. Harder, Johannes Beierlein, Oleg A. Egorov, Monika Emmerling, Constantin Krause, Christian Schneider, Tobias Huber-Loyola, Sven Hoefling
Summary: The introduction of topological physics to photonics has resulted in the development of robust photonic devices. While classical topological protection of light has been achieved, the utilization of quantum light sources in devices with topologically nontrivial resonances remains largely unexplored.
Article
Engineering, Electrical & Electronic
Nikolai B. Chichkov, Amit Yadav, Franck Joulain, Solenn Cozic, Semyon V. Smirnov, Leon Shterengas, Julian Scheuermann, Robert Weih, Johannes Koeth, Sven Hofling, Ulf Hinze, Samuel Poulain, Edik U. Rafailov
Summary: Building upon recent advances in GaSb-based diode lasers and Er-doped fluoride fibre technologies, this article demonstrates the fibre-based amplification of mid infrared diode lasers around 2.78 μm for the first time. The experimental results show output powers up to 0.9 W, pulse durations as short as 20 ns, and pulse repetition rates up to 1 MHz. Additionally, the impact of different fibre end-cap materials on laser performance is analyzed.
IEEE PHOTONICS JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Michael D. Fraser, H. Hoe Tan, Yago del Valle Inclan Redondo, Hima Kavuri, Elena A. Ostrovskaya, Christian Schneider, Sven Hoefling, Yoshihisa Yamamoto, Seigo Tarucha
Summary: The use of high energy proton implantation allows for precise and independent manipulation of both exciton and photon energies in GaAs microcavity exciton-polaritons. This technique involves post-growth proton implantation and annealing steps to induce small local interdiffusion, resulting in energy shifts in exciton or photon components. The polariton mode can be tuned by more than 10 meV, altering the effective mass for photon and exciton energy shifts, while maintaining narrow-linewidth polariton emission and condensation.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Physics, Applied
Quirin Buchinger, Simon Betzold, Sven Hoefling, Tobias Huber-Loyola
Summary: We conducted an optical study on various device designs of electrically contactable circular Bragg grating cavities in labyrinth geometries. In order to establish an electrical connection between the central disk and the surrounding membrane, we introduced connections between the adjacent rings separated by air gaps. By rotating these connections to create a labyrinth-like structure, we improved mode confinement, far-field pattern, and Purcell factor compared to layouts with connections arranged in straight lines. Reflectivity measurements and simulations were conducted to investigate the effects of different arrangements and sizes of connections on the optical properties and to determine the optimal design.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Bing Liu, Tim Wagner, Stefan Enzner, Philipp Eck, Martin Kamp, Giorgio Sangiovanni, Ralph Claessen
Summary: By synthesizing ultrathin Sb films on semi-insulating InSb(111)A substrate, researchers observe a pronounced moire pattern on the Sb films and confirm experimentally that the topological surface state persists and shifts toward lower binding energies with a decrease in Sb thickness, in agreement with theoretical predictions.
Article
Chemistry, Multidisciplinary
Yago del Valle-Inclan Redondo, Christian Schneider, Sebastian Klembt, Sven Hoefling, Seigo Tarucha, Michael D. Fraser
Summary: We have created a rotating polariton condensate at gigahertz frequencies by off-resonantly pumping with a rotating optical stirrer composed of structured laser modes. The results show that the rotating polariton condensate acquires angular momentum exceeding the critical 1n/particle and demonstrates deterministic nucleation and capture of quantized vortices with a handedness controlled by the pump rotation direction. This study enables new opportunities for exploring open dissipative superfluidity, ordering of non-Hermitian quantized vortex matter, and topological states in a highly nonlinear, photonic platform.
Article
Physics, Multidisciplinary
Carolin Lueders, Matthias Pukrop, Franziska Barkhausen, Elena Rozas, Christian Schneider, Sven Hoefling, Jan Sperling, Stefan Schumacher, Marc Assmann
Summary: We have developed a novel phase-space method to dynamically monitor quantum coherence in polariton condensates. Our approach allows us to quantify complex decoherence mechanisms and provides a stable system for long-term coherence. By reconstructing phase-space functions from homodyne detection data, we have demonstrated the potential of using quantum coherence for information processing up to the nanosecond regime.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Xiang You, Ming-Yang Zheng, Si Chen, Run-Ze Liu, Jian Qin, Mo-Chi Xu, Zheng-Xuan Ge, Tung-Hsun Chung, Yu-Kun Qiao, Yang-Fan Jiang, Han-Sen Zhong, Ming-Cheng Chen, Hui Wang, Yu-Ming He, Xiu-Ping Xie, Hao Li, Li-Xing You, Christian Schneider, Juan Yin, Teng-Yun Chen, Mohamed Benyoucef, Yong-Heng Huo, Sven Hoefling, Qiang Zhang, Chao-Yang Lu, Jian-Wei Pan
Summary: This study reports quantum interference between two single photons from independent semiconductor quantum dots (QDs) separated by a 302 km optical fiber, representing a key step towards long-distance solid-state quantum networks.
ADVANCED PHOTONICS
(2022)
