Article
Optics
Devarshi Chakrabarty, Avijit Dhara, Kritika Ghosh, Aswini K. Pattanayak, Shreyashi Mukherjee, Ayan Roy Chaudhuri, Sajal Dhara
Summary: The study demonstrates the generation of highly anisotropic exciton-polaritons at the interface of a biaxial layered semiconductor and a distributed Bragg reflector, with coupling strength tuned by rotating the incident beam polarization.
Article
Chemistry, Multidisciplinary
Rafal Mirek, Andrzej Opala, Paolo Comaron, Magdalena Furman, Mateusz Krol, Krzysztof Tyszka, Bartlomiej Seredynski, Dario Ballarini, Daniele Sanvitto, Timothy C. H. Liew, Wojciech Pacuski, Jan Suffczynski, Jacek Szczytko, Michal Matuszewski, Barbara Pietka
Summary: The rapid development of artificial neural networks and applied artificial intelligence has led to various applications, but current software implementation is limited in terms of performance and energy efficiency. Further progress may require the development of neuromorphic systems mimicking the structure of the human brain. By utilizing an optical network of nodes and semiconductor microcavities, efficient computation with nonlinearity can be achieved, showing promising results in pattern recognition tasks. This work opens up possibilities for ultrafast and energy-efficient neuromorphic systems leveraging the optical nonlinearity of polaritons.
Article
Optics
Tian-Yu Liu, Hai Wang, Mu-Sen Song, Le-Yi Zhao, Zi-Fan Hu, Hai-Yu Wang
Summary: The experimental observation of spin-dependent polariton-polariton interactions is reported, providing accurate evidence for such interactions occurring before spin depolarization. Additionally, strong coherent polariton-phonon coupling is detected in a perovskite microcavity for the first time.
LASER & PHOTONICS REVIEWS
(2022)
Review
Nanoscience & Nanotechnology
D. N. Basov, Ana Asenjo-Garcia, P. James Schuck, Xiaoyang Zhu, Angel Rubio
Summary: This brief review summarizes and elaborates on the nomenclature of polaritonic phenomena and systems in the literature on quantum materials and quantum optics, including at least 70 different types of polaritonic light-matter dressing effects. It also unravels a broad panorama of the physics and applications of polaritons, with a constantly updated version available at https://infrared.cni.columbia.edu.
Article
Materials Science, Multidisciplinary
Dmitriy Dovzhenko, Denis Aristov, Lucinda Pickup, Helgi Sigurosson, Pavlos Lagoudakis
Summary: We experimentally observed the next-nearest-neighbor coupling between ballistically expanding spinor exciton-polariton condensates in a planar semiconductor microcavity. We demonstrated all-optical control over the coupling strength between neighboring condensates by distance-periodic pseudospin screening. By screening the nearest-neighbor coupling, we overcame the conventional spatial coupling hierarchy between condensates.
Article
Materials Science, Multidisciplinary
T. C. H. Liew
Summary: Significant progress has been made in the control of exciton-polaritons in the past decades, including their creation, localization, coupling, manipulation, and detection. Due to their coherence and interaction properties, exciton-polaritons have become the focus of the emerging field of quantum polaritonics.
OPTICAL MATERIALS EXPRESS
(2023)
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
Materials Science, Multidisciplinary
R. Binder, N. H. Kwong
Summary: In a driven-dissipative quantum many-body system with spontaneous broken-symmetry steady state, soft fluctuation modes, in addition to the Goldstone mode, provide important insight into the system's dynamics. Using a microscopic polariton laser theory, rich transformation behavior of discrete and continuum soft modes in a two parameter space (pump density and cavity dissipation rate) is found. The theory gives a unified picture of various physical concepts such as Mott transition, Mollow spectra, polaritonic Bardeen-Cooper-Schrieffer gaps, and Goldstone companion modes, with transformation paths connecting Goldstone companion modes and Mollow analog modes across a line of exceptional points.
Article
Chemistry, Physical
Ruth H. Tichauer, Johannes Feist, Gerrit Groenhof
Summary: Coupling molecules to the confined light modes of an optical cavity shows promise for manipulating chemical reactions, but a complete understanding of the effects of strong light-matter coupling on molecular dynamics and reactivity is needed to fully exploit this principle. Despite recent progress in introducing strong coupling effects into quantum chemistry calculations, limitations exist due to challenges associated with accurately describing the cavity.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Bocheng Yuan, Yizhe Fan, Shengwei Ye, Yunshan Zhang, Yiming Sun, Xiao Sun, Weiqing Cheng, Song Liang, Yongguang Huang, Ruikang Zhang, Jue Wang, John H. Marsh, Lianping Hou
Summary: This study proposes and experimentally demonstrates a monolithic dual-wavelength DFB laser array based on sidewall gratings and a novel modulation of the grating coupling coefficient. The grating coupling coefficient distribution along the cavity is modulated by changing the alignment between the gratings on the two sidewalls. The frequency difference between the two lasing modes can be modulated by changing the cavity length and grating recess depth. A series of microwave signals in a wide frequency range is observed after beating the two optical lines.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Mengjie Wei, Arvydas Ruseckas, Van T. N. Mai, Atul Shukla, Ilene Allison, Shih-Chun Lo, Ebinazar B. Namdas, Graham A. Turnbull, Ifor D. W. Samuel
Summary: Organic semiconductors with tightly bound Frenkel excitons are attractive for demonstrating polariton lasing at room temperature. By investigating two new organic molecules combining fluorene and carbazole groups, the high thresholds of organic polariton lasers have been addressed. These materials show the lowest reported values for polariton lasing in organic semiconductor materials, bringing the realization of practical room temperature polaritonic devices closer.
LASER & PHOTONICS REVIEWS
(2021)
Article
Chemistry, Analytical
Lauren S. Puumala, Samantha M. Grist, Kithmin Wickremasinghe, Mohammed A. Al-Qadasi, Sheri Jahan Chowdhury, Yifei Liu, Matthew Mitchell, Lukas Chrostowski, Sudip Shekhar, Karen C. Cheung
Summary: Silicon photonic evanescent-field biosensors offer a cost-effective and portable solution for label-free detection. In this study, an improved SiP microring resonator sensor using fishbone-style sub-wavelength gratings was developed, providing enhanced robustness and sensitivity.
Article
Engineering, Electrical & Electronic
Shreeya H. Rane, Ajinkya S. Punjal, Shriganesh S. S. Prabhu, Dibakar Roy Chowdhury
Summary: Although the experimental detection of evanescent orders is challenging, Fourier transformed terahertz spectroscopy (FTTS) through near-field scanning terahertz microscopy (NSTM) can overcome the limitations and successfully detect the non-propagating evanescent orders originating from a 1-dimensional dielectric grating. The identification of evanescent orders demonstrates the potential of FTTS in exploring near-field systems and paves the way for studying other near-field phenomena in terahertz photonic systems.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Lal A. S. Krishna, Rabindra Biswas, Varun Raghunathan
Summary: In this study, off-axis excited guided-mode resonance (GMR) hybridization in one-dimensional (1D) partially etched amorphous silicon (a-Si) subwavelength grating structures operating in the mid-infrared wavelength range is experimentally investigated. The 1D dielectric photonic lattice is a promising platform for studying resonance hybridization effects due to its simple working principle and ease of electromagnetic design, fabrication, and experimental characterization. It is observed that increasing duty cycle of the gratings leads to avoided crossing between the coupled GMR branches, resulting in Friedrich-Wintgen type bound-states-in-the-continuum (FW-BICs) transitioning from the upper to the lower GMR branch. On either side of the band closure, the transmission spectra exhibit an interesting electromagnetically induced transparency (EIT)-like resonance, characterized by a transmission peak within a broad transmission dip and increased electric field concentration near the peak. As a conceptual application of coupled GMRs, the study demonstrates differential enhancement of infrared absorption from a polymethyl methacrylate (PMMA) layer coated on the grating structure, where one optical resonance is aligned to the absorption feature and the other serves as a built-in reference. The differential transmission contrast is enhanced by more than two orders of magnitude compared to the native PMMA layer.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Kirsty E. McGhee, Michele Guizzardi, Rahul Jayaprakash, Kyriacos Georgiou, Till Jessewitsch, Ullrich Scherf, Giulio Cerullo, Anton Zasedatelev, Tersilla Virgili, Pavlos G. Lagoudakis, David G. Lidzey
Summary: This study proposes a new strategy for the ultrafast control of polariton resonances by modifying the optical cavity mode. The researchers successfully generated fully-reversible blueshifts of the lower polariton branch without reducing the exciton-photon coupling strength. This work has important applications in emerging computing technologies.
ADVANCED OPTICAL MATERIALS
(2023)
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
Physics, Applied
A. Bader, F. Rothmayr, N. Khan, F. Jabeen, J. Koeth, S. Hoefling, F. Hartmann
Summary: This study presents an interband cascade infrared photodetector based on Ga-free type-II superlattice absorbers, achieving photovoltaic operation. Seven negative-differential-conductance (NDC) regions are observed at elevated temperatures, and the device shows high responsivity peaks under laser illumination.
APPLIED PHYSICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Davide Cimbri, Begum Yavas-Aydin, Fabian Hartmann, Fauzia Jabeen, Lukas Worschech, Sven Hofling, Edward Wasige
Summary: This article presents a reliable simulation approach to accurately model high-speed RTDs. The validity of the approach was verified by comparing simulated data with experimental measurements. This has significant implications for optimizing the design and application of RTDs.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Materials Science, Multidisciplinary
Eunice Y. Paik, Long Zhang, Shaocong Hou, Haonan Zhao, Yu-Hsun Chou, Stephen R. Forrest, Hui Deng
Summary: This study presents a method to assemble high quality-factor microcavities for van der Waals materials using high reflectance top mirrors. The method can be generalized to other photonic structures and will facilitate research using van der Waals materials.
ADVANCED OPTICAL MATERIALS
(2023)
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
Multidisciplinary Sciences
Qiuyang Li, Adam Alfrey, Jiaqi Hu, Nathanial Lydick, Eunice Paik, Bin Liu, Haiping Sun, Yang Lu, Ruoyu Wang, Stephen Forrest, Hui Deng
Summary: A method based on 1-dodecanol encapsulation and gold-tape-assisted exfoliation is developed for the synthesis of large-area and high-quality transition metal dichalcogenide (TMD) monolayers. The encapsulated monolayers show uniform exciton energy, linewidth, and quantum yield over the whole area, and can be integrated with photonic crystal cavities to enhance light-matter coupling.
NATURE COMMUNICATIONS
(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)
Article
Materials Science, Multidisciplinary
S. Grisard, H. Rose, A. V. Trifonov, R. Reichhardt, D. E. Reiter, M. Reichelt, C. Schneider, M. Kamp, S. Hofling, M. Bayer, T. Meier, I. A. Akimov
Summary: We study Rabi rotations in intensity-dependent photon echoes from a group of self-assembled InGaAs quantum dots. By using flattop intensity profiles of picosecond laser pulses, we are able to achieve a uniform distribution of intensities within the excited group and overcome the damping effect caused by the spatial inhomogeneity of Rabi frequencies from a Gaussian laser profile. Through photon echo polarimetry, we differentiate the coherent optical responses from exciton and trion groups. We find that the charging of the quantum dots under resonant excitation with intensive optical pulses leads to a significant reduction in the number of neutral quantum dots, while the trion group exhibits robust Rabi rotations with increased refocussing pulse areas. The remaining attenuation of Rabi rotations is analyzed through theoretical modeling, considering excitation-induced dephasing, dipole moment inhomogeneity, and coupling to acoustic phonons, revealing the dominant mechanism of optical coherence loss during the action of the involved optical pulses.
