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High-speed impulsive stimulated brillouin microscopy

Photonics Research 2024年第4期12卷 730-739页

作者： JIARUI LI TAORAN LE HONGYUAN ZHANG HAOYUN WEI YAN LI State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China Cole Eye Institute Cleveland ClinicClevelandOhio 44195USA

brillouin microscopy, which maps the elastic modulus from the frequency shift of scattered light, has evolved to a faster speed for the investigation of rapid biomechanical changes. Impulsive stimulated brillouin scattering (ISBS)spectroscopy has the potential to speed up measurement through the resonant amplification interaction from pulsed excitation and time-domain continuous detection. However, significant progress has not been achieved due to the limitation in signal-to-noise ratio (SNR) and the corresponding need for excessive averaging to maintain high spectral precision. Moreover, the limited spatial resolution also hinders its application in mechanical imaging. Here, by scrutinizing the SNR model, we design a high-speed ISBS microscope through multi-parameter optimization including phase, reference power, and acquisition time. Leveraging this, with the further assistance of the Matrix Pencil method for data processing, three-dimensional mechanical images are mapped under multiple contrast mechanisms for a millimeter-scale polydimethylsiloxane pattern immersed in methanol, enabling the identification of these two transparent materials without any contact or labeling. Our experimental results demonstrate the capability to maintain high spectral precision and resolution at a sub-millisecond integration time for one pixel. With a two-order improvement in the speed and a tenfold improvement in the spatial resolution over the state-of-the-art systems, this method makes it possible for ISBS microscopes to sensitively investigate rapid mechanical changes in time and space.

关键词： brillouin maintain methanol

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Study of the spatial growth of stimulated brillouin scattering in a gas-filled hohlraum via detecting the driven ion acoustic wave

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Matter and Radiation at Extremes 2024年第2期9卷 36-49页

作者： Chaoxin Chen Tao Gong Zhichao Li Liang Hao Yonggang Liu Xiangming Liu Hang Zhao Yaoyuan Liu Kaiqiang Pan Qi Li Sanwei Li Zhijun Li Sai Jin Feng Wang Dong Yang Laser Fusion Research Center China Academy of Engineering PhysicsMianyangSichuan 621900People’s Republic of China Institute of Applied Physics and Computational Mathematics Beijing 100094People’s Republic of China

In an experiment performed on the Shenguang-III prototype laser facility, collective Thomson scattering (TS) is used to study the spatialgrowth of stimulated brillouin scattering (SBS) in a gas-filled hohlraum by detecting the SBS-driven ion acoustic wave. High-quality timeresolved SBS and TS spectra are obtained simultaneously in the experiment, and these are analyzed by a steady-state code based on theray-tracing model. The analysis indicates that ion–ion collisions may play an important role in suppressing SBS growth in the Au plasma;as aresult, the SBS excited in the filled gas region is dominant. In the early phase of the laser pulse, SBS originates primarily from the high-densityplasma at the edges of the interaction beam channel, which is piled up by the heating of the interaction beam. Throughout the duration of thelaser pulse, the presence of the TS probe beam might mitigate SBS by perturbing the density distribution around the region overlapping withthe interaction beam.

关键词： scattering filled brillouin

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Stimulated brillouin interaction between guided phonons and photons in a lithium niobate waveguide

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 173-175页

作者： Yuan-Hao Yang Jia-Qi Wang Zheng-Xu Zhu Xin-Biao Xu Qiang Zhang Juanjuan Lu Yu Zeng Chun-Hua Dong Luyan Sun Guang-Can Guo Chang-Ling Zou CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China School of Information Science and Technology ShanghaiTech UniversityShanghai 201210China Center for Quantum Information Institute for Interdisciplinary Information SciencesTsinghua UniversityBeijing 100084China

The brillouin scattering is one of the strongest nonlinear optical effects in dielectrics[1].In particular,the backward brillouin scattering(BBS)provides an efficient method to achieve low-noise optical gain for active photonics[2]and the coherent interconnects between 10 GHz phonons and photons[3].However,previous studies on BBS are primarily limited to the unconfined phonons[1]or phonon confined in suspended structures[4-6].

关键词： scattering waveguide brillouin

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Enhancing stimulated brillouin scattering in the waveguide grating

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Optoelectronics Letters 2022年第3期18卷 143-147页

作者： WANG Minghai CUI Fengtao YANG Yang DONG Wei State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Big Data and Network Management Center Jilin UniversityChangchun 130012China Changchun Automotive Test Center Co. Ltd.Changchun 130012China

We obtain the enhanced stimulated brillouin scattering(SBS)by adding the optimized Bragg grating to an As_(2)S_(3) chalcogenide half suspended-core rectangle waveguide.The half suspended-core waveguide grating is characterized by the period of 344.67 nm and the refractive index modulation depth of 0.0001.Through simulation experiments,the obtained brillouin gain is 58.5 dB and the 3 dB bandwidth can reduce to 7.8 MHz.The half suspended-core waveguide structure can decrease the size of the chip while the periodic structure can enhance the slow light effect,so we have improved the integration of the waveguide and enhanced SBS by combining these two advantages.

关键词： waveguide scattering brillouin

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Surpassing 1,000,000 resolving points in chaotic brillouin sensing

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先进光子学(英文) 2023年第3期5卷 25-26页

作者： Yosuke Mizuno Yokohama National University YokohamaJapan

Optical fiber sensors have played a pivotal role in structural health monitoring for over half a century,owing to their inherent advantages such as lightweight design,compactness,immunity to electromagnetic interference,and their ability to enable distributed sensing.1 Within this diverse range of sensors,brillouin scattering has emerged as a widely adopted principle for distributed measurements of strain and temperature.

关键词： scattering brillouin chaotic

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Hundredfold increase of stimulated brillouin-scattering bandwidth in whispering-gallery mode resonators

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Photonics Research 2023年第6期11卷 917-924页

作者： GUOPING LIN JINGYI TIAN TANG SUN QINGHAI SONG YANNE K.CHEMBO Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System School of ScienceHarbin Institute of TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Shenzhen 518055China Department of Electrical and Computer Engineering&Institute for Research in Electronics and Applied Physics(IREAP) University of MarylandCollege ParkMaryland 20742USA

Backward stimulated brillouin scattering(SBS)is widely exploited for various applications in optics and optoelectronics.It typically features a narrow gain bandwidth of a few tens of megahertz in fluoride crystals.Here we report a hundredfold increase of SBS bandwidth in whispering-gallery mode resonators.The crystalline orientation results in a large variation of the acoustic phase velocity upon propagation along the periphery,from which a broad brillouin gain is formed.Over 2.5 GHz wide brillouin gain profile is theoretically found and experimentally validated.SBS phenomena with brillouin shift frequencies ranging from 11.73 to 14.47 GHz in ultrahigh Q Z-cut magnesium fluoride cavities pumped at the telecommunication wavelength are demonstrated.Furthermore,the brillouin-Kerr comb in this device is demonstrated.Over 400 comb lines spanning across a spectral window of 120 nm are observed.Our finding paves a new way for tailoring and harnessing the brillouin gain in crystals.

关键词： scattering pumped brillouin

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Tailoring spatial structure of brillouin spectra via spiral phase precoding

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Photonics Research 2021年第4期9卷 637-642页

作者： Hongwei Li Bo Zhao Jipeng Ni Wei Gao Heilongjiang Provincial Key Laboratory of Quantum Control School of ScienceHarbin University of Science and TechnologyHarbin 150080China National and Local Joint Engineering Research Center of Fiber Optic Sensing Technology College of Electronic EngineeringHeilongjiang UniversityHarbin 150080China

brillouin spectroscopy is an important topic and powerful tool in modern optics,as the acquisitions of acoustic velocities and elastic moduli are one of the keys to investigate and analyze the contents of material science and condensed matter physics.Although stimulated brillouin spectroscopy based on the pump-probe technique has striking advantages that include higher spectral resolution and signal-to-noise ratio,it is challenging to accomplish high-speed acquisition in the presence of pump background noise.In this paper,we propose a method for signal–noise separation through spiral phase precoding of the brillouin spectrum signal.We achieve on-demand tailoring spatial distribution of the signal,and hence the signal can be separated from the background noise.Furthermore,this approach has little energy loss due to phase-only modulation,and retains the advantages of high efficiency and high gain in brillouin interaction.The proof-of-principle demonstration provides a practical way to reshape the spatial structure of brillouin spectra,and shows the potential in quasi-noise-free nonlinear interactions.

关键词： pump brillouin phase

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brillouin scattering spectrum character extraction based on genetic algorithm and seeker optimization algorithm

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High Technology Letters 2019年第4期25卷 401-407页

作者：张燕君 Jin Peijun Fu Xinghu Hou Jiaoru Zhang Fangcao Xu Jinrui The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province School of Information Science and EngineeringYanshan UniversityQinhuangdao 066004P.R.China Department of Electrical and Computer Engineering Missouri University of Science and TechnologyRollaMissouri 65401USA

A new hybrid optimization method based on genetic algorithm(GA)and seeker optimization algorithm(SOA)is presented in this paper.The hybrid algorithm optimizes SOA by using crossover and mutation operations in GA in order to improve the global search ability of SOA.Four algorithms,i.***.particle swarm optimization(PSO),SOA,GA and quantum-behaved particle swarm optimization(GA-QPSO)and GA-SOA are used to process the simulation and experimental data of brillouin scattering spectrum(BSS)at different temperatures.The results show that GA-SOA improves the accuracy of extracting the center frequency shift and the minimum center frequency of brillouin scattering spectrum compared with other three algorithms.The shift error is 0.203 MHz.Therefore,GA-SOA can be applied to the accurate extraction of BSS characteristics.

关键词： brillouin scattering spectrum(BSS) seeker optimization algorithm(SOA) genetic algorithm(GA) particle swarm optimization(PSO) brillouin frequency shift(BFS)

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Study on two-cell stimulated brillouin scattering system with mixture medium

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Science China(Physics,Mechanics & Astronomy) 2007年第2期50卷 144-151页

作者： HASI Wuliji Institute of Opto-electronics Harbin Institute of TechnologyHarbin 150001China

In this paper,a method of choosing mixture medium in two-cell stimulated brillouinscattering(SBS)system to improve the system performance is proposed.The brillouin frequency shift(BFS)of mixture medium varies with the mixing ratio andthus the difference of the BFS between the two cells can be eliminated.The two-cellSBS system with acetone(C3H6O)in its generator cell and mixture liquid ofCCl4/C2Cl4 in its amplifier cell is investigated.The C3H6O has a high optical breakdown threshold and the mixture liquid of CCl4/C2Cl4 has a small absorption coeffi-cient and the same BFS as that of C3H6O when the volume fraction of CCl4 is 4%.Compared with two-cell SBS system with the same liquid(C2Cl4)or different liquid(C3H6O and C2Cl4)in generator and amplifier cell,the SBS system with mixture liq-uid(CCl4/C2Cl4)in amplifier cell and C3H6O in generator cell improves thepower-load,energy reflectivity(ER),phase conjugation(PC)fidelity and ER stabil-ity.

关键词： nonlinear optics stimulated brillouin scattering two-cell SBS system mixture medium

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Composite topological nodal lines penetrating the brillouin zone in orthorhombic AgF_(2)

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npj Computational Materials 2019年第1期5卷 694-701页

作者： Dexi Shao Huaiqiang Wang Tong Chen Pengchao Lu Qinyan Gu Li Sheng Dingyu Xing Jian Sun National Laboratory of Solid State Microstructures and Department of Physics Nanjing University210093 NanjingChina Collaborative Innovation Center of Advanced Microstructures 210093 NanjingChina

It has recently been found that nonsymmorphic symmetries can bring many exotic band crossings.Here,based on symmetry analysis,we predict that materials with time-reversal symmetry in the space group of Pbca(No.61)possess rich symmetry-enforced band crossings,including nodal surfaces,fourfold degenerate nodal lines and hourglass Dirac loops,which appear in triplets as ensured by the cyclic permutation symmetry.We take Pbca AgF_(2) as an example in real systems and studied its band structures with ab initio calculations.Specifically,in the absence of spin-orbit coupling(SOC),besides the above-mentioned band degeneracies,this system features a nodal chain and a nodal armillary sphere penetrating the brillouin zone(BZ).While with SOC,we find a new configuration of the hourglass Dirac loop/chain with the feature traversing the BZ,which originates from the splitting of a Dirac loop confined in the BZ.Furthermore,guided by the bulk-surface correspondence,we calculated the surface states to explore these bulk nodal phenomena.The evolution of these interesting nodal phenomena traversing the BZ under two specific uniaxial strains is also discussed.

关键词： nodal symmetry brillouin

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