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Subspace-induced Dirac point and nondissipative wave dynamics in a non-Hermitian optical lattice

Physical Review A 2022年第3期105卷 033512-033512页

作者： Shan Li Shulin Wang Shuyue Chen Yanting Wu Shaolin Ke Bing Wang Peixiang Lu School of Physics Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Optical Information and Pattern Recognitions Wuhan Institute of Technology Wuhan 430205 China Guangdong Intelligent Robotics Institute Dongguan 523808 China

We propose a mechanism to achieve real energy spectra via Hermitian subspace in non-Hermitian systems. As an illustrative example, we investigate a system composed of two identical Su-Schrieffer-Heeger (SSH) chains connected by a lossy site in each unit cell. Although the system as a whole is non-Hermitian, it is able to support Dirac points that coexist with exceptional points, exactly exhibiting real eigenenergies. The real spectra and coexistence of different singularities are inherited from two virtual decoupled subsystems after a transformation that comprises a Hermitian SSH chain and a non-Hermitian Lieb lattice. Furthermore, we show the two subsystems both experience topological phase transition by tuning coupling strength, allowing the exploration of Hermitian and non-Hermitian topological edge modes at the same time. In aid of Hermitian subspace, the waves could evolve without dissipation depending on initial injection, which contributes to coherent splitters with locked phase and intensity in two SSH layers. The proposed model can be realized in evanescently coupled optical waveguide arrays and further extended to other tight-binding systems.

关键词： Topological effects in photonic systems

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Research on Laser Measurement of 3D curved Glass Contour based on computer Vision 7

Research on Laser Measurement of 3D curved Glass Contour bas...

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7th International Conference on information Science and Control Engineering, ICISCE 2020

作者： Wang, Peng Wu, Jinmeng Yan, Guilin Bian, Shuo Wuhan Institute of Technology Hubei Key Laboratory of Optical Information and Pattern Recognition Hubei Research Centre of Video Image and High Definition Projection Wuhan China School of Electrical and Information Engineering School of Mechanical and Electrical Engineering

ISBN: (纸本)9781728164069

In the mobile phone glass industry, curved glass is widely used. Whether the curved glass is measured with high efficiency and precision and whether the curved edge profile error can be evaluated directly affects the quality and service cycle of glass products. In view of the difficulty of accurate measurement and evaluation of 3D mobile phones curved glass profile, a visual measurement method of 3D mobile phones curved glass profile error based on laser scanning and shape template matching is proposed in this paper. Accurate measurement of mobile phone curved glass greatly improves the fit between curved glass and mobile phone and the efficiency of production. Therefore, this paper proposes a method for evaluating the contour degree of curved glass on mobile phones based on Open Cascade and OpenCV. This method uses the lasers and camera equipment to extract the profile outline of the curved glass, then extract the profile outline of the mobile phone curved glass model that has been drawn in 3D software. The extracted contour lines are matched by methods such as translation and rotation, and finally the distance between the corresponding points is calculated as the contour error. Experimental results show that the method is able to accurately measure the profile error and greatly reduce the measurement instability and have good robustness. © 2020 IEEE.

关键词： Efficiency

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Magnetic-field-engineered optical nonlinearity and optical high-order sideband

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Physical Review A 2021年第6期104卷 063506-063506页

作者： Jiahua Li Chunling Ding Ying Wu School of Physics Huazhong University of Science and Technology Wuhan 430074 People's Republic of China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan 430205 People's Republic of China

Achieving strong optical nonlinearity in a low excitation power level is crucial in micro- and nanophotonics, central to many applications. Here, we explore optical linear and nonlinear responses in a single quantum dot (QD) embedded into a single-mode cavity under the effect of an external magnetic field and a continuous-wave laser excitation in the weak-coupling regime. Using experimentally realistic parameters, we find that the magnetic field introduced in such a coupled cavity-QD system can drastically modify the properties of photons and thus can be employed as a flexible control parameter. Especially, the enhanced optical Kerr nonlinearity can be achieved by tuning the applied magnetic field appropriately, which can reach over 11-fold improvement as compared to the case without the magnetic field. Physically, this is the consequence of the magnetic-field-induced resonance shifts and the cavity-field-mediated interferences. As an example of its applications, in the basis of this attainable strong Kerr nonlinearity, we show a feasible way of generating an optical high-order sideband efficiently, with small sideband spacing, as small as a few tens of megahertz, and low input excitation power, as low as a few nanowatts. Moreover, the manipulation of the high-order sideband is also discussed by changing the magnetic field from 0 to 3 T, where the variation of the sideband power is in good agreement with that of the Kerr nonlinearity. Considering realistic experimental conditions we elaborate the possible implementation of our proposal. In addition to being of fundamental interest, the results of our paper hold potential in optical frequency combs, nonlinear optics, and high precision measurement.

关键词： Cavity quantum electrodynamics Coherent control Nonlinear optical susceptibility Quantum description of light-matter interaction Cavity resonators

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Construction of Hierarchical Copper-Based Metal-Organic Frameworks Nanosheet Assemblies as an Efficient Electrocatalyst

SSRN

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SSRN 2022年

作者： Wei, Chenhuinan Wang, Zhuo Li, Shanyu Li, Tao Du, Xinran Wang, Huihu Yu, Ziyang Liu, Qiming Hubei Provincial Key Laboratory of Green Materials for Light Industry School of Materials and Chemical Engineering Hubei University of Technology Wuhan430068 China New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base Hubei University of Technology Wuhan China Hubei Key Laboratory of Optical Information and Pattern Recognition School of Optical Information and Energy Engineering Wuhan Institute of Technology Wuhan430205 China Key Laboratory of Ariticial Micro- and Nano-structures of Ministry of Education School of Physics and Technology Wuhan University Wuhan430068 China

Metal active sites in porous metal-organic frameworks (MOFs) are critical for their application in electrochemical sensing. Nature-inspired hierarchy and nanosheet structures are attractive platforms for electrocatalysts, because they offer a large contact area between the electrocatalyst and reactants. In this work, we reported a novel hierarchical nanosheet assembly (HSA) of copper 1,4-benzenedicarboxylate (CuBDC) MOFs. The HSA was constructed by three steps of in-situ growth on stone paper, including hydrolysis, anion exchange, and heteroepitaxy growth. The monodispersed 2D MOFs nanosheet units were aligned orderly and arranged into 3D hierarchical assemblies. This unique architecture facilitated the reactant dispersion and maximized the accessible active sites and charge-transport capability. The CuBDC HSA sensor exhibited better sensitivity to ascorbic acid than most reported MOFs-based sensors, including the CuBDC bulk sensor. In addition, the electrochemical analysis sheds light on the correlation between the structure and sensing performance. Our study offers a novel approach to constructing MOFs, exploiting their micro-, meso-, and macroscopic dimensions for various applications in the field of electrocatalysis. © 2022, The Authors. All rights reserved.

关键词： Nanosheets

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Mid-infrared Spectrally Pure Single-Photon States Generation from 22 Nonlinear optical Crystals

Quantum Engineering

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Quantum Engineering 2023年第1期2023卷

作者： Cai, Wu-Hao Tian, Ying Jin, Rui-Bo Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China Research Institute of Electrical Communication Tohoku University 2-1-1 Katahira Sendai980-8577 Japan Graduate School of Engineering Tohoku University 6-6 Aramaki Aza Aoba Aoba-ku Sendai980-8579 Japan

We theoretically investigate the preparation of pure-state single-photon source from 14 birefringent crystals (CMTC, THI, LiIO3, AAS, HGS, CGA, TAS, AGS, AGSe, GaSe, LIS, LISe, LGS, and LGSe) and 8 periodic poling crystals (LT, LN, KTP, KN, BaTiO3, MgBaF4, PMN-0.38PT, and OP-ZnSe) in a wavelength range from 1224 nm to 11650 nm. The three kinds of group-velocity-matching (GVM) conditions, the phase-matching conditions, the spectral purity, and the Hong-Ou-Mandel interference are calculated for each crystal. This study may provide high-quality single-photon sources for quantum sensing, quantum imaging, and quantum communication applications at the mid-infrared wavelength range. © 2023 Wu-Hao Cai et al.

关键词： Selenium compounds

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Magnetically induced optical transparency in a plasmon-exciton system

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Physical Review A 2021年第5期103卷 053706-053706页

作者： Jiahua Li Shuting Shen Chunling Ding Ying Wu School of Physics Huazhong University of Science and Technology Wuhan 430074 People's Republic of China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan 430205 People's Republic of China

Plasmonic structures such as metal nanoparticles (MNPs) provide a promising way to explore and control light in a solid-state environment. Here, we study a hybrid system composed of a localized surface plasmon mode of a MNP interacting with a semiconductor quantum dot (QD) subject to a Faraday magnetic field. The MNP-QD system is driven by an externally applied probe laser field and then its scattering photons are detected in the far field. To this end, employing a full quantum optical model, we theoretically calculate and demonstrate the scattering spectrum of the system via a combination of analytical and numerical techniques with realistic parameters. It is found that the applied magnetic field can be utilized to efficiently regulate and control the scattering line shapes. In particular, a class of optical transparency is induced in the scattering spectrum of the plasmon-excition (plexcitonic) system that we refer to as magnetically induced plexcitonic transparency. At the same time, a sharp double-Fano resonance profile is generated in the presence of the magnetic field. The predicted features of the spectra have potential applications in designing sensitive on-chip devices.

关键词： Cavity quantum electrodynamics Hybrid quantum systems Nanophotonics Plasmonics Quantum description of light-matter interaction Nanoparticles

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Progressive Learning-Based Jitter Distortion Correction for Remote Sensing Images of Time Delay and Integration Camera

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IEEE Transactions on Geoscience and Remote Sensing 2025年

作者： Zhu, Ying Wang, Hao Wang, Mi Pan, Jun Hong, Hanyu Ma, Lei Wang, Lei Wuhan Institute of Technology Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan430205 China Wuhan University State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan430079 China

The widespread use of time delay and integration charge-coupled device (TDI CCD) technology in high-resolution spaceborne optical cameras has made high-frequency jitter effects a common issue, resulting in different levels of distortion in images. Current methods mostly concentrate on correction of obviously high levels of geometric distortion. Focusing on low levels of geometric distortion, which are more difficult to accurately detect, this paper proposes a progressive learning-based correction method for high-frequency jitter distortion in remote sensing images from spaceborne TDI CCD cameras, utilizing a Generative Adversarial Network (GAN). First, a distorted dataset with diverse jitter levels for progressive training is generated through jitter simulation model by adjusting the parameters. Then, a GAN model is employed for the correction task. The generator consists of the Distortion Net for geometric distortion correction and the Detail Enhancement Net for image detail restoration. Finally, a progressive learning strategy is used to gradually enhance the ability of network to correct minor geometric distortion. The proposed method is validated using simulated images and real-world satellite images. Experimental results demonstrate that the proposed method outperforms existing restoration methods both in simulated datasets and practical scenarios. © 1980-2012 IEEE.

关键词： CCD cameras

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Spectrally Resolved Two-Photon Interference in a Modified Hong-Ou-Mandel Interferometer

SSRN

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SSRN 2022年

作者： Li, Baihong Yuan, Boxin Chen, Changhua Xiang, Xiao Quan, Runai Dong, Ruifang Zhang, Shougang Jin, Ruibo Department of Physics Shaanxi University of Science and Technology Xi’an710021 China Key Laboratory of Time and Frequency Primary Standards National Time Service Center Chinese Academy of Sciences Xi’an710600 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China

A modified Hong-Ou-Mandel(HOM) interference reveals that the two-photon interference phenomenon can be explained only by the concept of a two-photon wave packet rather than the single-photon one. However, the temporal interferogram in the modified HOM interferometer becomes flat in some cases so that no any useful information can be extracted from time-domain measurement. Here, we theoretically explore such temporal interferogram from the frequency domain and obtain the spectrally resolved interference with high visibility. The result represents a modulation for the joint spectral intensity along the directions of both frequency sum and frequency difference. This is quietly different from the cases of the spectrally resolved HOM interference and NOON state interference where the modulations happened only in one direction. Moreover, we have shown that such modulations have a potential application in generation and characterization of high-dimensional frequency entanglement. © 2022, The Authors. All rights reserved.

关键词： Interferometers

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Spectrally resolved two-photon interference in a modified Hong-Ou-Mandel interferometer

arXiv

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arXiv 2022年

作者： Li, Baihong Yuan, Boxin Chen, Changhua Xiang, Xiao Quan, Runai Dong, Ruifang Zhang, Shougang Jin, Rui-Bo Department of Physics Shaanxi University of Science and Technology Xi’an710021 China Key Laboratory of Time and Frequency Primary Standards National Time Service Center Chinese Academy of Sciences Xi’an710600 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China

A modified Hong–Ou–Mandel (HOM) interference reveals that the two-photon interference phenomenon can be explained only by the concept of a two-photon wave packet rather than a single-photon one. However, the temporal interferogram in the modified HOM interferometer becomes flat in some cases so that no useful information can be extracted from time-domain measurement. Here, we theoretically explore such temporal interferogram from the frequency domain and obtain the spectrally resolved interference with high visibility. The result represents a modulation of the joint spectral intensity along both the frequency sum and the frequency difference directions. This is quite different from the cases of the spectrally resolved HOM interference and N00N state interference where the modulations happened only in one direction. Moreover, we have shown that such modulations have a potential application in the generation and characterization of high-dimensional frequency entanglement. © 2022, CC BY.

关键词： Interferometers

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Identification of diffracted vortex beams at different propagation distances using deep learning

arXiv

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arXiv 2022年

作者： Lv, Heng Guo, Yan Yang, Zi-Xiang Ding, Chunling Cai, Wu-Hao You, Chenglong Jin, Rui-Bo Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China Quantum Photonics Laboratory Department of Physics and Astronomy Louisiana State University Baton RougeLA United States Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Shenzhen China

Orbital angular momentum of light is regarded as a valuable resource in quantum technology, especially in quantum communication and quantum sensing and ranging. However, the OAM state of light is susceptible to undesirable experimental conditions such as propagation distance and phase distortions, which hinders the potential for the realistic implementation of relevant technologies. In this article, we exploit an enhanced deep learning neural network to identify different OAM modes of light at multiple propagation distances with phase distortions. Specifically, our trained deep learning neural network can efficiently identify the vortex beam’s topological charge and propagation distance with 97% accuracy. Our technique has important implications for OAM based communication and sensing protocols. © 2022, CC BY.

关键词： Vortex flow

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