Article
Multidisciplinary Sciences
Xiaoyang Duan, Bo Wang, Kexiu Rong, Chieh-Li Liu, Vladi Gorovoy, Subhrajit Mukherjee, Vladimir Kleiner, Elad Koren, Erez Hasman
Summary: The researchers have demonstrated a room-temperature valley-addressable tungsten disulfide monolayer laser where the spin of lasing can be controlled by the spin of the pump without the need for magnetic fields. By manipulating the spin-valley coupling, this nanophotonic platform provides versatile coherent spin-light sources that can operate at room temperature.
Article
Chemistry, Multidisciplinary
Liqing Zhu, Yichun Pan, Linqi Chen, Zheng Wang, Fangxin Zhang, Guangran Yang, Changchang Huang, Wenping Hu, Long Zhang, Yingjun Zhang, Hongxing Dong, Weihang Zhou
Summary: We demonstrate the realization of tunable single-mode polariton lasing from highly excited Rydberg states by engineering the symmetry of the polaritonic wave function. By controlling the potential wells and the spatial overlap between the gain region and the eigen mode, we achieve single-mode lasing from quantized polariton states. The asymmetry of the potential well enables single-mode lasing even for the highly excited Rydberg state. The excellent reservoir-eigenmode overlap and efficient spatial confinement significantly reduce the lasing threshold compared to conventional pumping schemes.
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
Optics
Evangelos Dimopoulos, Aurimas Sakanas, Andrey Marchevsky, Meng Xiong, Yi Yu, Elizaveta Semenova, Jesper Mork, Kresten Yvind
Summary: This paper demonstrates a continuous-wave PhC nanolaser with an ultra-low threshold current, operating at room temperature. It also investigates the influence of carrier leakage and fabrication disorder on laser performance.
LASER & PHOTONICS REVIEWS
(2022)
Article
Nanoscience & Nanotechnology
Zhonghe Liu, Yudong Chen, Xiaochen Ge, Weidong Zhou
Summary: This paper presents a novel design of suspended arrays of PCNB cavities with lateral fins, which can be tuned for desired performance by controlling the alignment position of the fins. The proposed cavities are advantageous for energy efficient and ultra-compact photonics devices.
Article
Optics
Anwer Hayat, Libin Cui, Han Liang, Shuai Zhang, Xu Zhiyang, Muhammad Ali Khan, Gohar Aziz, Tianrui Zhai
Summary: Global research on solution-processable colloidal quantum dots (CQDs) has led to the fabrication of a 2D quasicrystal exhibiting 10-fold rotational symmetry. The study also developed a general analytical model based on cavity coupling effect to explain the multi-wavelength lasing phenomenon. The research shows potential for customizing 2D CQDs holographic photonic quasicrystal lasers in optoelectronic devices and miniature lasing systems.
Article
Crystallography
Bo Lu, Chen-Rui Fan, Jun-Yang Song, Chuan Wang
Summary: Optical parametric oscillation is a crucial method for realizing broadband middle infrared tunable lasers, depending on the non-linear response of matter to light. This research proposes an ultra-low threshold optical parametric oscillation generation method by constructing a dimer system, effectively enhancing the non-linear effect and increasing the energy conversion efficiency.
Article
Physics, Multidisciplinary
Junchao Li, Huanqing Chen, Guo Yu, Menglai Lei, Shunkun Li, Xiaodong Hu
Summary: Room-temperature exciton-polariton is observed in GaN/InGaN core-shell microrods grown by metal-organic vapor phase epitaxy. A large Rabi splitting over 265 meV is demonstrated in the core-shell microrod structure. Room-temperature lasing in core-shell microrods is confirmed by power-dependent photoluminescence spectra. The lasing in the shell layer results to a modulated lasing wavelength and takes one step further to more stable polariton lasing in MQW core-shell microrods.
Article
Multidisciplinary Sciences
Jinqi Wu, Sanjib Ghosh, Yusong Gan, Ying Shi, Subhaskar Mandal, Handong Sun, Baile Zhang, Timothy C. H. Liew, Rui Su, Qihua Xiong
Summary: Unlike conventional lasers, topological lasers can emit coherent light in the presence of disorders and defects due to their nontrivial band topology. Exciton polariton topological lasers, which have the unique property of not requiring population inversion, are a promising platform for low-power consumption. In this study, we experimentally demonstrate the realization of topological corner states and achieve polariton corner state lasing with a low threshold at room temperature using a perovskite polariton system. This achievement opens up possibilities for on-chip active polaritonics using higher-order topology.
Article
Materials Science, Multidisciplinary
Ting-Mao Feng, Yi-Fan Wang, Heng-Yi Tseng, Cheng-Chang LI, Hung-Chang Jau, Chie-Tong Kuo, Tsung-Heisn Lin, Chun-Ta Wang
Summary: In recent years, the development of lasers using photonic crystals as resonant cavities has grown. Chiral liquid crystals enable photonic crystal lasers to exhibit broad wavelength tuning capabilities. Our research focuses on the uniform standing helix and uniform lying helix states of chiral liquid crystals as resonant cavities, allowing for bidirectional switching of laser direction and wavelength tuning. Such a reconfigurable chiral photonic crystal laser has the potential for use in photonic applications.
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
Nanoscience & Nanotechnology
Ji Xia, Qifeng Qiao, Haoyang Sun, Yongjun Huang, Fook Siong Chau, Guangya Zhou
Summary: This paper proposes an integrated optomechanical electrometer for high-precision detection of electric charge using a nanophotonic optomechanical system. By utilizing a suspended photonic crystal nanobeam as a movable mechanical resonator, the optomechanical coupling transduces the mechanical motion to the optical field for enhanced sensitivity. The proposed scheme offers high sensitivity and resolution, making it suitable for ultrasensitive determination of charged nanoparticles in biological and chemical applications.
Article
Chemistry, Multidisciplinary
Yuyin Li, Peng Chen, Xianfei Zhang, Ziwen Yan, Tong Xu, Zili Xie, Xiangqian Xiu, Dunjun Chen, Hong Zhao, Yi Shi, Rong Zhang, Youdou Zheng
Summary: Low-threshold lasing under pulsed optical pumping is achieved in GaN-based microrod cavities at room temperature. The microrods are fabricated on patterned sapphire substrates (PSS). Confocal micro-photoluminescence spectroscopy is used to analyze the lasing properties of microrods with different diameters at different locations on the PSS substrates. The results show that the 2 μm-diameter microrod cavity has the lowest threshold.
Article
Materials Science, Multidisciplinary
Antti J. Moilanen, Kristin B. Arnardottir, Jonathan Keeling, Paivi Torma
Summary: In this study, the dynamics of multimode polariton lasing in organic microcavities is investigated using a second-order cumulant equation approach. By analyzing the time evolution of photon mode occupations, it is shown that the presence of multiple lasing peaks in time-integrated mode occupations can be attributed to either bimodal lasing or temporal switching between several modes. The origin of the temporal switching is found to be different in the weak and strong coupling regimes.
Article
Optics
Niels Heermeier, Tobias Heuser, Jan Grosse, Natalie Jung, Arsenty Kaganskiy, Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann, Stephan Reitzenstein
Summary: Spin-controlled lasers and high-beta quantum dot micropillar lasers are two fascinating photonic devices with potential applications. The experimental and predicted polarization oscillation frequencies of spin-laser effects are presented, demonstrating the possibility of developing more compact, faster, and more energy-efficient spin-lasers.
LASER & PHOTONICS REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Minghao Li, Shahana Nizar, Sudipta Saha, Anoop Thomas, Stefano Azzini, Thomas W. W. Ebbesen, Cyriaque Genet
Summary: We demonstrate that chiral Frenkel excitons in twisted bundles of cyanine J-aggregates exhibit strong circularly polarized luminescence. Measurements through a Mueller polarization analysis confirm a nearly perfect correlation between the dissymmetry factors in absorption and emission. The observed bisignate dissymmetry factors indicate a strong coupling between longitudinally excited chiral Frenkel excitons along the bundles, while a small Davydov splitting of 28 meV is resolved by polarimetry analysis. The chiroptical features with opposite optical chirality in the emission bands further reveal the anti-Kasha nature of the luminescence.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Jiawen Liu, Djamal Gacemi, Konstantinos Pantzas, Gregoire Beaudoin, Isabelle Sagnes, Angela Vasanelli, Carlo Sirtori, Yanko Todorov
Summary: An optomechanical scheme is presented to achieve light-controlled logic functions by combining an electromagnetic resonator with a strongly nonlinear nanomechanical oscillator. The nonlinear mechanical oscillations, controlled by external drives, are sensitive to incident light due to enhanced light-matter interactions. Reconfigurable logic functions (NOT, XOR, OR, AND) can be realized by adjusting the initial mechanical configurations to obtain various responses to input optical signals.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Mathematics, Applied
Soizic Terrien, Bernd Krauskopf, Neil G. R. Broderick, Venkata A. Pammi, Remy Braive, Isabelle Sagnes, Gregoire Beaudoin, Konstantinos Pantzas, Sylvain Barbay
Summary: In this study, the emergence of complex pulsing dynamics, including periodic, quasiperiodic, and irregular pulsing regimes, in an excitable microlaser subject to delayed optical feedback is investigated. A mathematical model, written as a system of delay differential equations, is used to perform an in-depth bifurcation analysis. Resonance tongues are found to play a key role in the emergence of complex dynamics.
Article
Optics
N. Coste, D. A. Fioretto, N. Belabas, S. C. Wein, P. Hilaire, R. Frantzeskakis, M. Gundin, B. Goes, N. Somaschi, M. Morassi, A. Lemaitre, I. Sagnes, A. Harouri, S. E. Economou, A. Auffeves, O. Krebs, L. Lanco, P. Senellart
Summary: A three-partite cluster state made of one semiconductor spin and two indistinguishable photons is generated from an InGaAs quantum dot embedded in a pillar microcavity. The three-partite entanglement rate is 0.53 MHz at the output of the device.
Article
Optics
Thanavorn Poempool, Johannes Aberl, Marco Clementi, Lukas Spindlberger, Lada Vukusic, Matteo Galli, Dario Gerace, Frank Fournel, Jean-Michel Hartmann, Friedrich Schaeffler, Moritz Brehm, Thomas Fromherz
Summary: We have successfully embedded a single SiGe quantum dot (QD) into a bichromatic photonic crystal resonator (PhCR) at the position of maximum modal electric field by optimizing the MBE growth technique. Record quality (Q) factors for QD-loaded PhCRs up to Q ~ 105 have been achieved. Our findings confirm the single QD in the center of the resonator as a potentially novel photon source in the telecom spectral range.
Article
Optics
Baptise Chomet, Nathan Vigne, Gregoire Beaudoin, Konstantinos Pantzas, Stephane Blin, Isabelle Sagnes, Stephane Denet, Arnaud Garnache
Summary: The emission dynamics of a multimode broadband interband semiconductor laser have been examined through experimentation and theory. The study reveals the presence of a modulational instability in the nonlinear dynamics of a III-V semiconductor quantum well surface-emitting laser, observed in the anomalous dispersion regime. An additional unstable region arises in the normal dispersion regime due to carrier dynamics, which is not found in systems with fast gain recovery. The interplay between cavity dispersion and phase sensitive non-linearities is shown to significantly impact the laser emission behavior.
Article
Nanoscience & Nanotechnology
Anne Rodriguez, Priya Priya, Edson R. Cardozo R. de Oliveira, Abdelmounaim Harouri, Isabelle Sagnes, Florian Pastier, Luc Le Gratiet, Martina Morassi, Aristide Lemaitre, Loic Lanco, Martin Esmann, Norberto Daniel Lanzillotti-Kimura
Summary: In this study, the polarization of excitation laser and Brillouin signal in bulk crystalline solids is manipulated using polarization-sensitive optical resonances in elliptical micropillars, allowing for measurement of acoustic phonons with frequencies difficult to access with standard Brillouin and Raman spectroscopies. This technique can have applications in various polarization-sensitive optical systems, and in optomechanical, optoelectronic, and quantum optics devices.
Article
Nanoscience & Nanotechnology
Felicien Appas, Othmane Meskine, Aristide Lemaitre, Jose Palomo, Florent Baboux, Maria I. Amanti, Sara Ducci
Summary: The ability to combine advanced functionalities on a single chip is crucial for both classical and quantum photonic technologies. Generating and handling orthogonally polarized photon pairs on a chip is a central challenge for scalable quantum photonics circuits. In this study, a monolithic AlGaAs chip was used to generate broadband orthogonally polarized photon pairs and split their polarizations, achieving a separation rate of 85% over a 60 nm bandwidth. The results demonstrate the validity of this approach and represent a significant step toward miniaturized and easy-to-handle photonic devices for quantum information processing.
Article
Chemistry, Multidisciplinary
E. Rongione, L. Baringthon, D. She, G. Patriarche, R. Lebrun, A. Lemaitre, M. Morassi, N. Reyren, M. Micica, J. Mangeney, J. Tignon, F. Bertran, S. Dhillon, P. Le Fevre, H. Jaffres, J. -m. George
Summary: By combining spin- and angle-resolved photoemission spectroscopy with time-resolved THz emission spectroscopy, it is demonstrated that spin-charge conversion mainly arises from the surface state in ultrathin films of Bi1-xSbx. The robustness of the surface state and the significant conversion efficiency in epitaxial Bi1-xSbx thin films bring new perspectives for ultra-low power magnetic random-access memories and broadband THz generation.
Article
Physics, Applied
Eva Diaz, Alberto Anadon, Martina Morassi, Michel Hehn, Aristide Lemaitre, Jon Gorchon
Summary: This work focuses on the full characterization of terahertz pulses confined in waveguides. Terahertz photoconductive switch detectors were fabricated and used to sample the electrical pulses. Two calibration methods were developed to accurately characterize the pulse amplitude. These techniques provide a reliable tool to explore nonlinear phenomena at high THz intensities.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
C. Symonds, V. Toanen, A. Gassenq, J. -m. Benoit, A. Pereira, E. Cleyet-Merle, R. Fulcrand, F. Bessueille, S. Minot, M. Morassi, A. Lemaitre, J. Bellessa
Summary: This Letter presents a fabrication process for current injection into micrometer-size Ag/GaAs Tamm emitting diodes with special care to avoid surface damages. Electroluminescence from GaAs quantum wells is demonstrated at room temperature, showing dispersion following the Tamm mode. Additionally, for small diameters Tamm structures, electroluminescence occurs in discretized energy modes due to in-plane confinement. This observation of electrically excited emission from a confined diode is a significant advancement towards Tamm plasmon optical devices with novel functionalities.
APPLIED PHYSICS LETTERS
(2023)
Article
Multidisciplinary Sciences
Debanjan Polley, Akshay Pattabi, Ashwin Rastogi, Kaushalya Jhuria, Eva Diaz, Hanuman Singh, Aristide Lemaitre, Michel Hehn, Jon Gorchon, Jeffrey Bokor
Summary: In this study, we experimentally demonstrate ultrafast spin-orbit torque-induced coherent magnetization switching dynamics in a ferromagnet and propose a unique magnetization switching mechanism that can significantly increase the writing speed of magnetic random-access memory devices.
Article
Computer Science, Artificial Intelligence
Davide Cugini, Dario Gerace, Pietro Govoni, Aurora Perego, Davide Valsecchi
Summary: We compare quantum and classical machine learning techniques for the classification of signal and background events in the Vector Boson Scattering processes at the Large Hadron Collider. Quantum machine learning algorithms based on variational quantum circuits perform well on freely available quantum computing hardware, outperforming deep neural networks on classical computing facilities. We demonstrate that quantum neural networks can correctly classify the targeted signal with AUC close to classical neural networks while using fewer resources and less variable data in the training set.
QUANTUM MACHINE INTELLIGENCE
(2023)
Article
Environmental Sciences
Jingfeng Liu, Luyao Xin, Lixia Qin, Taiyang Zhang, Xiangqing Li, Shi-Zhao Kang
Summary: A flexible SERS sensing platform was developed to monitor the concentration of benzotriazole in water. The platform showed high sensitivity with a detection limit of 0.01 nmol L-1 and excellent repeatability and reproducibility. This research is important for real-time monitoring of trace benzotriazole in tap water.
Article
Nanoscience & Nanotechnology
Agostino Di Francescantonio, Attilio Zilli, Davide Rocco, Laure Coudrat, Fabrizio Conti, Paolo Biagioni, Lamberto Duo, Aristide Lemaitre, Costantino De Angelis, Giuseppe Leo, Marco Finazzi, Michele Celebrano
Summary: By utilizing a nonlinear periodic metasurface, we have demonstrated all-optical routing of telecom photons upconverted to the visible range. This was achieved through the interference between two frequency-degenerate upconversion processes, namely third-harmonic and sum-frequency generation, controlled by tuning the relative phase and polarization between the pump beams. This technique allows for the modulation of the upconverted signal among the diffraction orders of the metasurface with high efficiency.
NATURE NANOTECHNOLOGY
(2023)
