Author Affiliations
Abstract
1 Key Laboratory of Optoelectronic Devices and Systems of Guangdong Province and Ministry of Education, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
2 Med-X Research Institute and School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
3 Department of Chemistry, Institute of Molecular Aggregation Science, Tianjin University, Tianjin 300072, China
Visualizing rapid biological dynamics like neuronal signaling and microvascular flow is crucial yet challenging due to photon noise and motion artifacts. Here we present a deep learning framework for enhancing the spatiotemporal relations of optical microscopy data. Our approach leverages correlations of mirrored perspectives from conjugated scan paths, training a model to suppress noise and motion blur by restoring degraded spatial features. Quantitative validation on vibrational calcium imaging validates significant gains in spatiotemporal correlation (2.2×), signal-to-noise ratio (9–12 dB), structural similarity (6.6×), and motion tolerance compared to raw data. We further apply the framework to diverse in vivo experiments from mouse cerebral hemodynamics to zebrafish cardiac dynamics. This approach enables the clear visualization of the rapid nutrient flow (30 mm/s) in microcirculation and the systolic and diastolic processes of heartbeat (2.7 cycle/s), as well as cellular and vascular structure in deep cortex. Unlike techniques relying on temporal correlations, learning inherent spatial priors avoids motion-induced artifacts. This self-supervised strategy flexibly enhances live microscopy under photon-limited and motion-prone regimes.
PhotoniX
2024, 5(1): 1
Author Affiliations
Abstract
1 School of Physics, Henan Normal University, Xinxiang 453007, China
2 MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin 300457, China
3 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4 Institute of Physics, Henan Academy of Sciences, Zhengzhou 450046, China
5 e-mail: phyzhxd@gmail.com
6 e-mail: tanya@nankai.edu.cn
7 e-mail: zl-zhu@htu.edu.cn
Higher-order exceptional points (EPs), which appear as multifold degeneracies in the spectra of non-Hermitian systems, are garnering extensive attention in various multidisciplinary fields. However, constructing higher-order EPs still remains a challenge due to the strict requirement of the system symmetries. Here we demonstrate that higher-order EPs can be judiciously fabricated in parity–time (PT)-symmetric staggered rhombic lattices by introducing not only on-site gain/loss but also non-Hermitian couplings. Zero-energy flatbands persist and symmetry-protected third-order EPs (EP3s) arise in these systems owing to the non-Hermitian chiral/sublattice symmetry, but distinct phase transitions and propagation dynamics occur. Specifically, the EP3 arises at the Brillouin zone (BZ) boundary in the presence of on-site gain/loss. The single-site excitations display an exponential power increase in the PT-broken phase. Meanwhile, a nearly flatband sustains when a small lattice perturbation is applied. For the lattices with non-Hermitian couplings, however, the EP3 appears at the BZ center. Quite remarkably, our analysis unveils a dynamical delocalization-localization transition for the excitation of the dispersive bands and a quartic power increase beyond the EP3. Our scheme provides a new platform toward the investigation of the higher-order EPs and can be further extended to the study of topological phase transitions or nonlinear processes associated with higher-order EPs.
Photonics Research
2023, 11(2): 225
作者单位
摘要
1 航天工程大学 宇航科学与技术系 激光推进及其应用国家重点实验室,北京 101416
2 中国科学院重庆绿色智能研究院,重庆 401122
超燃冲压发动机激光吸收光谱测量系统目前主要采用分立式光学探头形式与发动机机体固定,但是受到探头尺寸的限制,无法获得高分辨率的流场信息。文中设计了一种基于自由曲面透镜和透镜阵列相结合的燃烧场高密度光学测量环。该测量环采用两层结构,发射端分别位于每条边最边缘位置,激光准直透镜和自由曲面透镜形成扇形光束,扇形光束穿过被测流场后,经过楔形镜偏转和聚焦透镜聚焦,进入接收光纤后传送至探测器。测量环接收单元最小间隔为5 mm,实现了在5 cm×7 cm空间内88条光线的密集排列。重点讨论光学系统光线分布设计方案,并给出收发端结构设计方案,实验结果表明,光线利用效率大于50%,光线总传输效率大于55%。设计的高密度光学测量环可以直接与发动机机体相衔接,避免环境因素干扰,可以实现对超燃冲压发动机隔离段、燃烧室出口等处温度、组分浓度的二维分布测量。
激光吸收光谱 高密度光学测量环 自由曲面透镜 扇形光束 燃烧流场 laser absorption spectroscopy high-resolution optical measuring ring free-curved lens fan-beam combustion flow field 
红外与激光工程
2021, 50(10): 20210063
Author Affiliations
Abstract
1 Key Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Department of Physics, Henan Normal University, Xinxiang 453007, China
4 Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081, China
We study optomechanically induced transparency in a spinning microresonator. We find that in the presence of rotation-induced Sagnac frequency shift, both the transmission rate and the group delay of the signal are strongly affected, leading to a Fano-like spectrum of transparency. In particular, tuning the rotary speed leads to the emergence of nonreciprocal optical sidebands. This indicates a promising new way to control hybrid light–sound devices with spinning resonators.
Coherent optical effects Optomechanics 
Photonics Research
2017, 5(4): 04000367

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