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2023 International Congress on Ultrasonics, ICU Beijing 2023

作者： Fang, Yousong Feng, Ting Ni, Chenyin Liu, Chengcheng Cheng, Qian School of Electronic and Optical Engineering Nanjing University of Science and Technology Nanjing210094 China Institute of Biomedical Engineering & Technology Academy for Engineering and Technology Fudan University Shanghai200433 China Institute of Acoustics School of Physics Science and Engineering Tongji University Shanghai200092 China

Photoacoustic imaging (PAI) technology combines the advantages of acoustic resolution and optical contrast imaging within deep tissue. The commonly clinically used bone fracture detection and evaluation method is X-ray based imaging techniques. In order to study the feasibility of human radius fractures detection in non-radiation and non-invasive way, this study combined the time-of-flight (TOF) method commonly used in industrial nondestructive testing with photoacoustic technology for the detection and location of bone fractures. Firstly, the bone fracture information carried by PA signal was studied by simulating the bone models with different locations of bone fractures. The finite difference time domain (FDTD) method was used to simulate the propagation process of photoacoustic signal in bone tissue. Secondly, the PATOF diagrams formed by PA signals at different locations is obtained by using laser fixed and ultrasonic detector motion detection method. Finally, the PATOF diagrams are further analyzed and quantified. The results show that the photoacoustic bone detection method based on TOF method can effectively locate the fracture location. This study confirms the feasibility of combining PAI technique with TOF method to detect bone fractures, which indicates that PAI technique has great application prospect in bone detection field. © 2024 institute of physics Publishing. All rights reserved.

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Multifunctional light-field modulation based on hybrid nonlinear metasurfaces

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Chinese physics B 2023年第10期32卷 73-89页

作者：钱树航王凯杨加兴关超龙华陆培祥 Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and TechnologyWuhan 430074China School of Electronic and Information Engineering Hubei University of Science and TechnologyXianning 437100China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205China

The generation characteristics of nonlinear optical signals and their multi-dimensional modulation at micro-nano scale have become a prominent research area in nanophotonics,and also the key to developing various novel nonlinear photonics *** recent years,the demand for higher nonlinear conversion efficiency and device integration has led to the rapid progress of hybrid nonlinear metasurfaces composed of nanostructures and nonlinear *** a joint platform of stable wavefront modulation,nonlinear metasurface and efficient frequency conversion,hybrid nonlinear metasurfaces offer a splendid opportunity for developing the next-generation of multipurpose flat-optics *** article provides a comprehensive review of recent advances in hybrid nonlinear metasurfaces for light-field *** advantages of hybrid systems are discussed from the perspectives of multifunctional light-field modulation,valleytronic modulation,and quantum ***,the remaining challenges of hybrid metasurfaces are summarized and future developments are also prospected.

关键词： light-field modulation hybrid metasurfaces nonlinear optics two-dimensional materials

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First-principles study of non-radiative carrier capture by defects at amorphous-SiO_(2)/Si(100)interface

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Chinese physics B 2023年第7期32卷 504-509页

作者：祝浩然谢伟锋刘欣刘杨张金利左旭 College of Electronic Information and Optical Engineering Nankai UniversityTianjin 300350China Institute of Electronic Engineering China Academy of Engineering PhysicsMianyang 621999China Microsystem and Terahertz Research Center China Academy of Engineering PhysicsChengdu 610200China Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Nankai UniversityTianjin 300350China Engineering Research Center of Thin Film Optoelectronics Technology Ministry of EducationNankai UniversityTianjin 300350China

Defects have a significant impact on the performance of semiconductor *** the first-principles combined with one-dimensional static coupling theory approach,we have calculated the variation of carrier capture coefficients with temperature for the interfacial defects P_(b0) and P_(b1) in amorphous-SiO_(2)/Si(100)*** is found that the geometrical shapes of P_(b0) and P_(b1) defects undergo large deformations after capturing carriers to form charged defects,especially for the Si atoms containing a dangling *** hole capture coefficients of neutral P_(b0) and P_(b1) defects are largest than the other capture coefficients,indicating that these defects have a higher probability of forming positively charged ***,the calculated results of non-radiative recombination coefficient of these defects show that both P_(b0) and P_(b1) defects are the dominant non-radiative recombination centers in the interface of a-SiO_(2)/Si(100).

关键词： interface defect carrier capture coefficients

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Influence of surface modification technique on the properties of jute – Sisal fibre filled epoxy composites

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Materials Today: Proceedings 2022年 65卷 2578-2580页

作者： Nigrawal, Archana Kumar Sharma, Arun Haque, Fozia Z. Optical Nano Materials Lab Department of Physics Maulana Azad National Institute of Technology India Department of Mechanical Engineering Laxmipati Institute of Science and Technology India

Natural fibers have gain a lot of consciousness as potential alternative for the substitution of man-made fibers, as reinforcement of a range of resins for highly developed application as they are having little density, renewable, sustainable, and eco-friendly. Throughout processing, natural fibers are not having any harmful effects and are not coarse to the dispensation apparatus. In this paper hybrid composite by using jute fibre and sisal fibre reinforced with epoxy resin has been prepared and their mechanical properties and dc conductivity have been measured. Measurements have been conducted on the hybrid composites by using Electrometer. It is observed that the hybrid composite having unidirectional orientation of jute fibre and sisal fibre gives better mechanical properties. It was observed that the surface treatment of fibres eliminates some quantity of lignin, wax and oils on both sides of the cell wall of the fibres and the alteration of certain amount of alpha to beta cellulose. Due to these changes there is an improvement in tensile strength of the composites and increase in conductivity was also observed. © 2022

关键词： Jute fibers

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Recent progress in nuclear astrophysics research and its astrophysical implications at the China institute of Atomic Energy

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Nuclear Science and Techniques 2024年第12期35卷 376-408页

作者： Wei-Ping Liu Bing Guo Zhu An Bao-Qun Cui Xiao Fang Chang-Bo Fu Bin-Shui Gao Jian-Jun He Yu-Chen Jiang Chong Lv Er-Tao Li Ge-Xing Li Yun-Ju Li Zhi-Hong Li Gang Lian Wei-Ping Lin Yi-Hui Liu Wei Nan Wei-Ke Nan Yang-Ping Shen Na Song Jun Su Liang-Ting Sun Xiao-Dong Tang Luo-Huan Wang Shuo Wang You-Bao Wang Di Wu Xiao-Feng Xi Sheng-Quan Yan Li-Yong Zhang China Institute of Atomic Energy Beijing 102413China Department of Physics Southern University of Science and TechnologyShenzhen 518055China Jinping Deep Underground Frontier Science and Dark Matter Key Laboratory of Sichuan Province Liangshan 615000China School of Physics Xi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Key Laboratory of Nuclear Physics and Ion-beam Application(MoE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Joint Department for Nuclear Physics Institute of Modern PhysicsChinese Academy of Sciences and Lanzhou UniversityLanzhou 730000China CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern PhysicsChinese Academy of SciencesLanzhou 73000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhenChina Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Mathematics and Physics Handan UniversityHandan 056005China Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space SciencesShandong UniversityWeihai 264209China State Key Laboratory of Nuclear Physics and Technology School of PhysicsCAPTPeking UniversityBeijing 100871China

Nuclear astrophysics is a rapidly developing interdisciplinary feld of research that has received extensive attention from the scientifc community since the midtwentieth ***,it uses the laws of extremely small atomic nuclei to explain the evolution of the *** to the complexity of nucleosynthesis processes and our limited understanding of nuclear physics in astrophysical environments,several critical astrophysical problems remain *** achieve a better understanding of astrophysics,it is necessary to measure the cross sections of key nuclear reactions with the precision required by astrophysical *** measurement of nuclear reaction cross sections is an important method of investigating how nuclear reactions infuence stellar *** the challenges involved in measuring the extremely low crosssections of nuclear reactions in the Gamow peak and preparing radioactive targets,indirect methods,such as the transfer reaction,coulomb dissociation,and surrogate ratio methods,have been developed over the past several *** are powerful tools in the investigation of,for example,neutron-capture(n,r)reactions with short-lived radioactive ***,direct measurement is still preferable,such as in the case of reactions involving light and stable *** an essential part of stellar evolution,these low-energy stable nuclear reactions have been of particular interest in recent *** overcome the diffculties in measurements near or deeply within the Gamow window,the combination of an underground laboratory and high-exposure accelerator/detector complex is currently the optimal ***,underground experiments have emerged as a new and promising direction of *** addition,to better simulate the stellar environment in the laboratory,research on nuclear physics under laser-driven plasma conditions has gradually become a frontier *** recent years,the CIAE team conducted a series of distinctive nuclea

关键词： Nuclear astrophysics Indirect method Underground laboratory Direct measurement Lowenergy nuclear reaction

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Characteristic Analysis of 3 × 3 Coupler-based Nonlinear optical Loop Mirrors for Spectrum Equalization in optical Frequency Combs

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Journal of Lightwave technology 2025年第12期43卷 5856-5868页

作者： Yang, Yunxia Yan, Xianglei Ding, Jiazheng Chen, Shuangcheng Yang, Huajun Jiang, Ping Xu, Mingfeng University of Electronic Science and Technology of China School of Physics Chengdu610054 China Chinese Academy of Sciences National Key Laboratory of Optical Field Manipulation Science and Technology Chengdu610209 China Chinese Academy of Sciences State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering Institute of Optics and Electronics Chengdu610209 China Chinese Academy of Sciences Research Center on Vector Optical Fields Institute of Optics and Electronics Chengdu610209 China Tianfu Xinglong Lake Laboratory Chengdu610299 China

Research progress on optical frequency combs (OFCs) has provided promising solutions for advancements in various fields. However, the interference from non-ideal components in the temporal waveform of OFC signals often leads to spectral non-flatness, which limits their applicability, especially in ultra-wideband applications. To address this issue, we propose a cavity-free ultra-flat OFC generation scheme, utilizing a nonlinear optical loop mirror (NOLM) based on a 3 × 3 fiber coupler to achieve significant pulse shaping. To the best of our knowledge, this is the first time that a 3 × 3 NOLM has been incorporated into an OFC generation system. In this work, the transmission model for all possible configurations of the 3 × 3 NOLM is derived and analyzed. Under identical input light field conditions, the proposed optimal 3 × 3 NOLM achieves a pulse sidelobe suppression ratio (SSR) improvement of 15.9 dB compared to the optimal 2 × 2 NOLM, resulting in a flatness enhancement of 11.6 dB. When compared to the ideal linear parabolic shape, the proposed optimal 3 × 3 NOLM yields a mean-squared error (MSE) of 0.006, versus 0.3 for the optimal 2 × 2 NOLM-based scheme, following the nonlinear mixing process in OFC generation. The results demonstrate that the proposed scheme offers superior background noise suppression, enhanced central spectral equalization efficiency, reduced pumping power requirements, and improved robustness against modulation parameter variations. This work provides innovative technical support for more efficient OFC generation, which will promote the broader implementation of OFCs across various applications. © 1983-2012 IEEE.

关键词： Mirrors

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Harpoon-shaped topological photonic crystal for on-chip beam splitter

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Science China(physics,Mechanics & Astronomy) 2024年第9期67卷 91-98页

作者： Zhiwei Guan Ruixue Dou Chuangxin Xie Tianyimei Zuo Liyu Huang Keyin Wen Chaofeng Wang Huapeng Ye Junmin Liu Ze Dong Dianyuan Fan Shuqing Chen Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060China College of Physics and Engineering Technology Minzu Normal University of XingyiXingyi 562400China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118China School of information and Electronics Beijing Institute of TechnologyBeijing 100081China

The advancement of integrated optical communication networks necessitates the deployment of on-chip beam splitters for efficient signal interconnections at network ***,the pursuit of micron-scale beam splitting with large corners and reducing the device footprint to boost connection flexibility often results in phase *** mismatches,which stem from radiation modes and backward scattering,pose significant obstacles in creating highly integrated and interference-resistant *** address this,we introduce a solution based on the topological valley-contrasting state generated by photonic crystals with opposing valley Chern numbers,manifested in a harpoon-shaped structure designed to steer the splitting *** approach enables adiabatic mode field evolution over large corners,capitalizing on the robust phase modulation capabilities and topological protection provided by the subwavelength-scale valley-contrasting *** demonstration reveals that beam splitters with large corners of 60°,90°,and 120°exhibit insertion loss fluctuations below 2.7 dB while maintaining a minimal footprint of 8.8μm×8.8μ*** a practical demonstration,these devices facilitate three-channel signal connections,successfully transmitting quadrature phase shift keying signals at 3.66 Tbit/s with bit error rates below the forward error correction threshold,demonstrating performance comparable to that in defects *** harnessing the unidirectional excitation feature,we anticipate significant enhancements in the capabilities of signal distribution and connection networks through a daisy chain configuration.

关键词： channel interconnection on-chip beam splitter topological valley-contrasting state

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Dynamic gain driven mode-locking in GHz fiber laser

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Light(Science & Applications) 2024年第11期13卷 2715-2725页

作者： Xuewen Chen Wei Lin Xu Hu Wenlong Wang Zhaoheng Liang Lin Ling Yang Yang Yuankai Guo Tao Liu Dongdan Chen Xiaoming Wei Zhongmin Yang School of Physics and Optoelectronics State Key Laboratory of Luminescent Materials and DevicesGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesGuangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of TechnologyGuangzhouChina Research Institute of Future Technology South China Normal UniversityGuangzhouGuangdongChina

Ultrafast lasers have become powerful tools in various fields,and increasing their fundamental repetition rates to the gigahertz(GHz)level holds great potential for frontier scientific and industrial *** various schemes,passive mode-locking in ultrashort-cavity fiber laser is promising for generating GHz ultrashort pulses(typically solitons),for its simplicity and ***,its pulse energy is far lower than the critical value of the existing theory,leading to open questions on the mode-locking mechanism of GHz fiber ***,we study the passive mode-locking in GHz fiber lasers by exploring dynamic gain depletion and recovery(GDR)effect,and establish a theoretical model for comprehensively understanding its low-threshold mode-locking mechanism with multi-GHz fundamental repetition ***,the GDR effect yields an effective interaction force and thereby binds multi-GHz solitons to form a counterpart of soliton *** is found that the resulting collective behavior of the solitons effectively reduces the saturation energy of the gain fiber and permits orders of magnitude lower pulse energy for continuous-wave mode-locking(CWML).A new concept of quasi-single soliton defined in a strongly correlated length is also proposed to gain insight into the dynamics of soliton assembling,which enables the crossover from the present mode-locking theory to the existing ***,two distinguishing dynamics of Q-switched mode-locking that respectively exhibit rectangular-and Gaussian-shape envelopes are theoretically indicated and experimentally verified in the mode-locked GHz fiber laser through the measurements using both the standard real-time oscilloscope and emerging time-lens *** on the proposed criterion of CWML,we finally implement a GDR-mediated mode-locked fiber laser with an unprecedentedly high fundamental repetition rate of up to 21 GHz and a signal-tonoise ratio of 85.9 dB.

关键词： fiber mode locking

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Pixel-excitation-gating enhanced nonlinear imaging with a GHz femtosecond pulse laser

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Chinese Optics Letters 2024年第12期22卷 33-37页

作者： Wenlong Wang Junpeng Wen Yuke Sheng Wei Lin Chiyi Wei Cihang Kong Dongdan Chen Xiaoming Wei Zhongmin Yang School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China Institute for Translational Brain Research Fudan UniversityShanghai 200032China School of Materials Science and Engineering Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesGuangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of TechnologyGuangzhou 510641China Research Institute of Future Technology South China Normal UniversityGuangzhou 510006China

In this Letter,we propose a pixel-excitation-gating technology for high-sensitivity nonlinear imaging excited by femtosecond pulses at a GHz repetition rate,which can enhance the signal quality of nonlinear *** validate this technology,we apply it to a customized two-photon excitation(TPE)fluorescence microscope that uses a GHz femtosecond pulse fiber laser as the excitation *** with the excitation using a continuous GHz pulse train,up to~4-fold enhancement of fluorescence signal can be obtained when the excitation pulse train is gated with a 25%duty cycle of the pixel dwell time,under constant average *** is anticipated that pixel-level-excitation gating can be an add-on solution for fluorescence signal enhancement in nonlinear imaging systems that are excited by GHz femtosecond ***,the pixel-level excitation control would allow more flexible excitation.

关键词： multiphoton fluorescence microscopy GHz femtosecond pulse laser signal enhancement pixel-excitation gating

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Angular momentum holography via a minimalist metasurface for optical nested encryption

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Light(Science & Applications) 2023年第4期12卷 646-656页

作者： Hui Yang Peng He Kai Ou Yueqiang Hu Yuting Jiang Xiangnian Ou Honghui Jia Zhenwei Xie Xiaocong Yuan Huigao Duan National Research Center for High-Efficiency Grinding College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China Nanophotonics Research Center Shenzhen Key Laboratory of Micro-scale Optical Information TechnologyInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060GuangdongChina Institute of Precision Optical Engineering School of Physics Science and EngineeringTongji UniversityShanghai 200092China Greater Bay Area Institute for Innovation Hunan UniversityGuangzhou 511300Guangdong ProvinceChina

Metasurfaces can perform high-performance multi-functional integration by manipulating the abundant physical dimensions of light,demonstrating great potential in high-capacity information *** orbital angular momentum(OAM)and spin angular momentum(SAM)dimensions have been respectively explored as the independent carrier for information ***,fully managing these two intrinsic properties in information multiplexing remains ***,we propose the concept of angular momentum(AM)holography which can fully synergize these two fundamental dimensions to act as the information carrier,via a single-layer,non-interleaved *** underlying mechanism relies on independently controlling the two spin eigenstates and arbitrary overlaying them in each operation channel,thereby spatially modulating the resulting waveform at *** a proof of concept,we demonstrate an AM meta-hologram allowing the reconstruction of two sets of holographic images,i.e.,the spin-orbital locked and the spin-superimposed ***,leveraging the designed dual-functional AM meta-hologram,we demonstrate a novel optical nested encryption scheme,which is able to achieve parallel information transmission with ultra-high capacity and *** work opens a new avenue for optionally manipulating the AM,holding promising applications in the fields of optical communication,information security and quantum science.

关键词： momentum dimensions orbital

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