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Observing non-Hermiticity induced chirality breaking in a synthetic Hall ladder

light(Science & Applications) 2025年第1期14卷 280-290页

作者： Rui Ye Yanyan He Guangzhen Li Luojia Wang Xiaoxiong Wu Xin Qiao Yuanlin Zheng Liang Jin Da-Wei Wang Luqi Yuan Xianfeng Chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai200240China School of Physics Nankai UniversityTianjin300071China Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control School of Physicsand State Key Laboratory for Extreme Photonics and InstrumentationZhejiang UniversityHangzhou310027China Shanghai Research Center for Quantum Sciences Shanghai201315China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan250358China

Non-Hermitian topological photonics plays a key role in bridging topological matter with gain and loss engineering in *** we report the experimental observation of the break of chiral currents in a Hall ladder from the non-Hermiticity by constructing synthetic frequency dimension in two rings,where currents on both legs of the ladder co-propagate in the same *** origin of such phenomena is resulted from the interplay between the effective magnetic flux and the on-site gain and *** non-Hermitian co-propagating currents exhibit characteristics of unidirectional frequency conversion in both rings,and moreover,different from the counterpart in Hermitian systems,can provide a method to probe the signatures of the non-Hermitian skin effect from steady-state bulk *** model is further extended to models including next-nearest-neighbor couplings,pointing to a way for observing the non-Hermitian signature with higher winding number,and provides a new control knob for light manipulation with the topological dissipation engineering.

关键词： ladder topological signature

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Brightness function across varying adapting luminance in head-mounted displays

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Journal of the Optical Society of America A 2025年第7期42卷 927-937页

作者： Zan Jin Shining Ma Yue Liu Yongtian Wang Weitao Song State Key Laboratory of Chips and Systems for Advanced Light Field Display School of Optics and Photonics Beijing Institute of Technology Beijing 100081 China Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and Photonics Beijing Institute of Technology Beijing 100081 China

Brightness functions describe the relationship between perceived brightness and stimulus luminance under various viewing conditions. Previous studies have highlighted the effects of adapting luminance and ambient conditions on perceived brightness. Brightness functions are essential for ensuring accurate tone reproduction across different media and viewing conditions. Most prior research on this topic has been conducted in real environments using either simple or complex stimuli. With the development of head-mounted displays (HMDs), the need for accurate tone reproduction in 3D virtual scenes has emerged, requiring accurate brightness functions for different adapting luminance levels. However, brightness perception in HMDs has been scarcely investigated, and it remains unclear whether traditional brightness functions are applicable to HMDs. To address this gap, this study employed a magnitude estimation method to collect brightness ratings for stimuli in complex images under varying adapting luminance levels. The results revealed a systematic deviation between the observed brightness ratings and the model predictions, with stimuli appearing brighter in HMDs, particularly under low adapting luminance levels. This finding suggests that viewing conditions in HMDs—likely influenced by their limited field of view—affect brightness perception compared to real-world scenes.

关键词： Augmented reality Image enhancement Image metrics Image quality Photometry Virtual reality

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Landau rainbow based on Floquet helical waveguide systems

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Optics Letters 2025年第12期50卷 3990-3993页

作者： Rong Zhou Zhihao Wang Wenshuo Ma Wen Zhao Yongchun Liu Cuicui Lu Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems State Key Laboratory of Chips and Systems for Advanced Light Field Display Center for Interdisciplinary Science of Optical Quantum and NEMS Integration School of Physics Beijing Institute of Technology Beijing 100081 China State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Frontier Science Center for Quantum Information Beijing 100084 China ycliu@***

A topological rainbow can separate topological photonic states with different frequencies to different spatial localizations. The Landau levels offer significant insights for the study of topological bulk states and inspire the discovery of novel topological states and phenomena. The Landau rainbow, as a typical topological rainbow, in which different frequencies of Landau modes can be separated into different positions, exhibits potential applications for designing broadband photonic devices. In this Letter, we propose a Landau rainbow based on the zero-order Landau level of Floquet helical waveguide systems for the first time to our knowledge. The photonic Landau levels are induced by a pseudo-magnetic field by engineering the gradient effective coupling strength, and the helical configuration of the waveguides breaks the degeneracy of the zero-order Landau levels resulting in band tilting. Therefore, the states in the zero-order Landau level exhibit distinct quasienergies and are located at different spatial positions, which show a Landau rainbow effect. The Landau rainbow based on Floquet helical waveguide systems provides new avenues for the realization of robust photonic devices, such as rainbow trapping device, multifrequency divider, and optical information storage.

关键词： CCD cameras Gaussian beams light propagation Optical systems Photonic devices Spatial frequency

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Multispectral imaging colorimetric measurement method with illumination-adaptive white calibration

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Journal of the Optical Society of America A 2025年第7期42卷 898-907页

作者： Yue Yuan Ruoduan Sun Xufen Xie XueYan Zhang Liang Qu Shining Ma Juntao Li Yue Liu Yongtian Wang Weitao Song State Key Laboratory of Chips and Systems for Advanced Light Field Display School of Optics and Photonics Beijing Institute of Technology Beijing 100081 China Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and Photonics Beijing Institute of Technology Beijing 100081 China National Institute of Metrology Beijing 100029 China Research Institute of Photonics. Information Science and Engineering School Dalian Polytechnic University Dalian 116034 China Conservation Standards Research Institute The Palace Museum Beijing 100009 China Zhengzhou Academy of Intelligent Technology Beijing Institute of Technology Zhengzhou 450000 China

Accurate and standardized color measurement of non-planar surfaces in non-contact scenarios remains a challenge, primarily due to complex measurement conditions such as uncontrolled illumination and variable surface scattering properties. To address this issue, a multispectral imaging colorimetric measurement method for non-planar surfaces based on uniform illumination and illumination-adaptive white calibration was proposed. The colorimetric characterization method relies on spectral reconstruction using a multiple-channel input backpropagation neural network, which processes the imaging system’s output with illumination-adaptive white calibration and spectral fusion techniques. A device has been developed following this method, consisting of a large integrating sphere, an eight-channel multispectral camera, and a stepper motor-driven rotating table. To reduce the impact from the illumination, the rotating table, coated with polytetrafluoroethylene (PTFE), allows for sample placement and illumination-adaptive white calibration. After applying PTFE data correction to the test samples, the average reconstruction error decreased from 2.4 to 1.5 in terms of CIEDE2000 color difference units. To assess the measurement deviation on glossy curved surfaces at different angles, we tested it on a blue-and-white porcelain object with a smooth glaze. The $\Delta {E_{00}}$ remained below 2 across observation angles, demonstrating superior accuracy over conventional point light sources for glossy objects. The device was subsequently used to measure porcelain exhibits at the Forbidden City. Experimental results confirmed that the proposed method ensures uniform and stable diffuse lighting and effectively combines digital imaging with spectroscopy, making it a powerful tool for precise color analysis in the non-contact domain.

关键词： Biomedical imaging CCD cameras Computational imaging Imaging systems light sources Spatial resolution

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Buildup dynamics of room-temperature polariton condensation

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Physical Review B 2022年第2期106卷 L020301-L020301页

作者： Fei Chen Hang Zhou Ziyu Ye Song Luo Zheng Sun Yuanlin Zheng Xianfeng Chen Huailiang Xu Hongxing Xu Tim Byrnes Hui Li Zhanghai Chen Jian Wu State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200241 China Department of Physics College of Physical Science and Technology Xiamen University Xiamen 361005 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Collaborative Innovation Center of Light Manipulation and Applications Shandong Normal University Jinan 250358 China Division of Arts and Sciences New York University Shanghai 1555 Century Ave Pudong New District Shanghai 200122 China NYU-ECNU Institute of Physics at NYU Shanghai 3663 Zhongshan Road North Shanghai 200062 China Department of Physics New York University New York New York 10003 USA Center for Quantum and Topological Systems (CQTS) NYUAD Research Institute New York University Abu Dhabi United Arab Emirates Wuhan National High Magnetic Field Center Wuhan 430074 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing Jiangsu 210093 China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan Shanxi 030006 China CAS Center for Excellence in Ultra-intense Laser Science Shanghai 201800 China

By using the femtosecond angle-resolved spectroscopic imaging technique, the ultrafast buildup dynamics of room-temperature polariton condensation is explicitly visualized in a ZnO whispering gallery mode microcavity. The buildup time of polariton condensation with respect to the arrival of the femtosecond pump pulse decreases with the increasing pump power and reaches a lower limit of about 4 ps. Simulation results by numerically solving the open-dissipative Gross-Pitaevskii equation coupled to an incoherent reservoir are in quantitative agreement with the experimental observations, showing that the scattering from exciton reservoir to the lower polariton branches and the decay from these branches dominate the buildup process.

关键词： Polaritons Transition metal oxides Time-resolved photoluminescence Ultrafast femtosecond pump probe Whispering gallery mode resonators

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Mineral bridge thermal toughening of composite DLC coating to improve the mold thermal stability at 500 °C high temperature

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Journal of Alloys and Compounds 2025年 1035卷

作者： Tao Sun Tianfeng Zhou Weijia Guo Xiuwen Sun Qian Yu Bin Zhao Benshuai Ruan Yubing Guo School of Medical Technology Beijings Institute of Technology Beijing 100081 China State Key Laboratory of Chips and Systems for Advanced Light Field Display Beijing Institute of Technology Beijing 100081 China School of Mechanical Engineering Beijing Institute of Technology Beijing 100081 China Cheerful Micro-Nano Technology (Ningbo) Co. Ltd. Ningbo 315500 China

The extensive application of diamond-like carbon (DLC)-coated molds in glass molding processes has been constrained by thermal expansion mismatch between the mold substrate and coating. Critical challenges involve maintaining DLC layer integrity under elevated temperatures and enhancing the service temperature limits of DLC-coated molds. This study proposes a mineral bridge thermal toughening (MBTT) method to improve the mechanical performance of coatings, thereby increasing the service temperature of DLC-coated molds. A titanium transition layer was implemented to mitigate thermal expansion discrepancies between the DLC layer and mold substrate via amorphous phase reaction with nickel in the substrate. High-temperature stepwise heat treatment facilitated interface diffusion reactions between nickel and titanium, inducing the formation of nickel crystalline mineral bridges. The mechanisms governing coating fragmentation and mineral bridge formation were elucidated, accompanied by a shear lag model to optimize transition layer thickness, mineral bridge density, and service temperature. A 70 nm transition layer optimally balances thermal stability and mechanical performance, enabling sustained operation at 500 °C while maintaining maximum internal stress below the DLC layer’s yield strength. A mineral bridge density of 10 bridges per micron length minimizes transitional layer stress. Surface profile errors caused by mineral bridge formation negligibly affect mold service performance. This work establishes a practical methodology for enhancing the high-temperature performance of DLC-coated molds.

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Suspended graphene-based NEMS accelerometers with direct electrical readout

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Microsystems & nanoengineering 2025年第1期11卷 111页

作者： Jie Ding Chang He Hongliang Ma Wendong Zhang Xuge Fan School of Integrated Circuits and Electronics Beijing Institute of Technology 100081 Beijing China. School of Interdisciplinary Science Beijing Institute of Technology 100081 Beijing China. State Key Laboratory of Chips and Systems for Advanced Light Field Display Center for Interdisciplinary Science of Optical Quantum and NEMS Integration School of Physics Beijing Institute of Technology Beijing 100081 China. State key Laboratory of Extreme Environment Optoelectronic Dynamic Measurement Technology and Instrument North University of China Taiyuan 030051 China. wdzhang@***. School of Integrated Circuits and Electronics Beijing Institute of Technology 100081 Beijing China. xgfan@***. School of Interdisciplinary Science Beijing Institute of Technology 100081 Beijing China. xgfan@***. State Key Laboratory of Chips and Systems for Advanced Light Field Display Center for Interdisciplinary Science of Optical Quantum and NEMS Integration School of Physics Beijing Institute of Technology Beijing 100081 China. xgfan@***.

Atomically thin suspended graphene can be used as NEMS transducers for ultra-small and high-performance sensors due to its excellent mechanical and electrical properties. Most applications of suspended graphene in NEMS devices are limited to pressure sensors, resonators, switches, etc. Graphene-based NEMS accelerometers have rarely been reported, with limitations such as mechanical robustness, life span and device yield, thereby limiting their practical applications. Here, we reported piezoresistive graphene-based NEMS accelerometers with high manufacturing yield, excellent mechanical robustness and stability, and long life span, in which the width of trenches for suspending graphene membranes was only 1 µm and fully-clamped suspended double-layer graphene membranes with an attached SiO/Si proof mass was used as acceleration transducer. The impact of geometrical sizes of the proof mass attached to the suspended graphene membranes on the output signal of devices has been studied. These findings would contribute to rapid developments and practical applications of ultra-small and high-performance graphene-based NEMS accelerometers and related devices.

关键词： Accelerometers

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Quantum spin excitations in a dual-core magnetic molecule

arXiv

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arXiv 2025年

作者： Li, Wenbin Shi, Wenwen Xiao, Xiaoxiao Zhu, Haiyan Cheng, Cai Wang, Dongfei Chen, Lan Haze, Masahiro Fu, Huixia Zheng, Xiao Guo, Yang Li, Zhendong Hasegawa, Yukio Institute for Solid State Physics The University of Tokyo Chiba277-8581 Japan CAS Key Laboratory of Precision and Intelligent Chemistry University of Science and Technology of China Hefei230026 China Key Laboratory of Theoretical and Computational Photochemistry Ministry of Education College of Chemistry Beijing Normal University Beijing100875 China Center of Quantum Materials and Devices Chongqing Key Laboratory for Strongly Coupled Physics College of Physics Chongqing University Chongqing401331 China School of Physics and Electronic Engineering Sichuan Normal University Chengdu610101 China School of Materials and Energy State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China Chengdu610054 China State Key Laboratory of Chips and Systems for Advanced Light Field Display Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement Ministry of Education School of Physics Beijing Institute of Technology Beijing100081 China Institute of Physics Chinese Academy of Sciences Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China Department of Chemistry Fudan University Shanghai200433 China School of Chemistry and Chemical Engineering Shandong University Qingdao266237 China

Magnetic excitations are important quantum phenomena in magnetic systems and have been widely studied in individual magnetic atoms and molecules as well as their assembled structures over the past few decades. Using scanning tunneling microscopy/spectroscopy (STM/S) combined with density functional theory (DFT) and the state-of-the-art ab initio wavefunction calculations, we investigated the properties of a novel dual-core Cr2Br6 molecule, which consists of two Cr ions coupled via superexchange through a single near-90° Cr-Br-Cr scissors bond. Under zero magnetic field, we observed a Fano peak with multi-steps through STS. When an external magnetic field is applied, some steps exhibit additional splitting, while others change little. We find that the Cr2Br6, exhibits a spin-degenerate ground state, and the complex peak splitting arises from the coexistence of vibrational and magnetic excitations in the molecule. Our results reveal rich quantum spin behavior in a well-defined two-core magnetic trihalide complex at the atomic scale, offering not only a minimal model for superexchange-coupled multi-spin quantum excitations but also a possible foundational unit for future molecule-based quantum functionalities. Copyright © 2025, The Authors. All rights reserved.

关键词： Magnetic fields

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Photon retention in coherently excited nitrogen ions

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Science Bulletin 2021年第15期66卷 1511-1517,M0003页

作者： Jinping Yao Luojia Wang Jinming Chen Yuexin Wan Zhihao Zhang Fangbo Zhang Lingling Qiao Shupeng Yu Botao Fu Zengxiu Zhao Chengyin Wu Vladislav VYakovlev Luqi Yuan Xianfeng Chen Ya Cheng State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science Shanghai Institute of Optics and Fine Mechanics(SIOM)Chinese Academy of Sciences(CAS)Shanghai 201800China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 200031China Department of Physics National University of Defense TechnologyChangsha 410073China State Key Laboratory for Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Texas A&M University College StationTX 77843USA Shanghai Research Center for Quantum Sciences Shanghai 201315China Jinan Institute of Quantum Technology Jinan 250101China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Quantum coherence in quantum optics is an essential part of optical information processing and light *** metal vapors,despite the numerous shortcomings,are traditionally used in quantum optics as a working medium due to convenient near-infrared excitation,strong dipole transitions and long-lived ***,we proposed and experimentally demonstrated photon retention and subsequent re-emittance with the quantum coherence in a system of coherently excited molecular nitrogen ions(N_(2)^(+))which are produced using a strong 800 nm femtosecond laser *** photon retention,facilitated by quantum coherence,keeps releasing directly-unmeasurable coherent photons for tens of picoseconds,but is able to be read out by a time-delayed femtosecond pulse centered at 1580 nm via two-photon resonant absorption,resulting in a strong radiation at 329.3 *** reveal a pivotal role of the excited-state population to transmit such extremely weak re-emitted photons in this *** new finding unveils the nature of the coherent quantum control in N_(2)^(+)for the potential platform for optical information storage in the remote atmosphere,and facilitates further exploration of fundamental interactions in the quantum optical platform with strong-field ionized molecules.

关键词： Quantum coherence Photon retention Coherent quantum control Strong-field ionized molecules

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Optically Controlled Femtosecond Polariton Switch at Room Temperature

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Physical Review Letters 2022年第5期129卷 057402-057402页

作者： Fei Chen Hui Li Hang Zhou Song Luo Zheng Sun Ziyu Ye Fenghao Sun Jiawei Wang Yuanlin Zheng Xianfeng Chen Huailiang Xu Hongxing Xu Tim Byrnes Zhanghai Chen Jian Wu State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200241 China Department of Physics College of Physical Science and Technology Xiamen University Xiamen 361005 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Collaborative Innovation Center of Light Manipulation and Applications Shandong Normal University Jinan 250358 China Division of Arts and Sciences New York University Shanghai 1555 Century Ave Pudong New District Shanghai 200122 China NYU-ECNU Institute of Physics at NYU Shanghai 3663 Zhongshan Road North Shanghai 200062 China Center for Quantum and Topological Systems (CQTS) NYUAD Research Institute New York University Abu Dhabi UAE Department of Physics New York University New York New York 10003 USA Wuhan National High Magnetic Field Center Wuhan 430074 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing Jiangsu 210093 China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan Shanxi 030006 China CAS Center for Excellence in Ultra-intense Laser Science Shanghai 201800 China

Exciton polaritons have shown great potential for applications such as low-threshold lasing, quantum simulation, and dissipation-free circuits. In this paper, we realize a room temperature ultrafast polaritonic switch where the Bose-Einstein condensate population can be depleted at the hundred femtosecond timescale with high extinction ratios. This is achieved by applying an ultrashort optical control pulse, inducing parametric scattering within the photon part of the polariton condensate via a four-wave mixing process. Using a femtosecond angle-resolved spectroscopic imaging technique, the erasure and revival of the polariton condensates can be visualized. The condensate depletion and revival are well modeled by an open-dissipative Gross-Pitaevskii equation including parametric scattering process. This pushes the speed frontier of all-optical controlled polaritonic switches at room temperature towards the THz regime.

关键词： Exciton polariton Optoelectronics Ultrafast phenomena

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