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High Power Laser science and engineering 2018年第2期6卷 38-44页

作者： Wei Chen Bowen Liu Youjian Song Lu Chai Qianjin Cui Qingjing Liu Chingyue Wang Minglie Hu Ultrafast Laser Laboratory Key Laboratory of Opto-Electronic Information Technology Ministry of Education School of Precision Instrument and Opto-Electronics Engineering Tianjin University Laize Photonics Co. Ltd

We demonstrate an all polarization-maintaining(PM) fiber mode-locked laser seeded, hybrid fiber/solid-slab picosecond pulse laser system which outputs 40 μJ, 10 ps pulses at the central wavelength of 1064 nm. The beam quality factors M2 in the unstable and stable directions are 1.35 and 1.31, respectively. 15 μJ picosecond pulses at the central wavelength of 355 nm are generated through third harmonic generation(THG) by using two Li B3 O5(LBO) crystals, in order to get better processing efficiency on polycrystalline diamonds. The high pulse energy and beam quality of these ultraviolet(UV) picosecond pulses are confirmed by latter experiments of material processing on polycrystalline diamonds. This scheme which combines the advantages of the all PM fiber mode-locked laser and the solid-slab amplifier enables compact, robust and chirped pulse amplification-free amplification with high power picosecond pulses.

关键词： all polarization-maintaining fiber chirped pulse amplification free amplification hybrid fiber/solid slab material processing mode-locked laser

Achieving high dielectric energy-storage properties through a phase coexistence design and viscous polymer process in BNT-based ceramics

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Journal of Materiomics 2023年第6期9卷 1004-1014页

作者： Yule Yang Juanjuan Wang Ruiyi Jing Wenjing Shi Leiyang Zhang Chao Li Xinyu Zeng Fukang Chen Gang Liu Xiaolian Chao Yan Yan Li Jin school of Materials science and engineering Xi'an University of TechnologyXi'an710048China electronic Materials Research Laboratory Key Laboratory of the Ministry of EducationSchool of Electronic Science and EngineeringXi'an Jiaotong UniversityXi'an710049China instrument Analysis Center Xi'an Jiaotong UniversityXi'an710049China school of Materials and Energy Southwest UniversityChongqing400715China Key Laboratory for Macromolecular science of Shaanxi Province Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an710062China

In the last few decades,dielectric capacitors have gotten a lot of attention because they can store more power and charge and discharge very *** it has a low energy-storage density(Wrec),efficiency(h),and temperature *** adding Pb(Mg1/3Nb2/3)O3(PMN)and(Bi0$1Sr0.85)TiO3(BST)to a nonstoichiometric(Bi0$51Na0.5)TiO3(BNT)matrix,the goal is to change the phase transition properties and make the material more relaxor ferroelectric(RFE)by lowering the remnant polarization Pr and keeping the maximum polarization Pmax.A viscous polymer process(VPP)is used to improve the electric breakdown strength,which is also a key part of being able to store *** working together,ceramics with the formula 0.79[0.85BNT-0.15PMN]-0.21BST(BP-0.21BST)are *** phase structure has been changed from a rhombohedral phase to a rhombohedral-tetragonal coexisted *** is beneficial for RFE properties and gives a Wrec of 6.45 J/cm^(3) and a h of 90%at 400 kV/***,the energy-storage property is very temperature stable between 30 and 150*** results show that process optimization and composition design can be used to improve the energy storage properties,and that the dielectric ceramic materials made can be used in high-powder pulse dielectric capacitors.

关键词： BNT Energy-storage Charge-discharge Viscous polymer process Relaxor ferroelectric

Interface effect on superlattice quality and optical properties of InAs/GaSb type-Ⅱ superlattices grown by molecular beam epitaxy

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Chinese Physics B 2022年第12期31卷 671-676页

作者：刘昭君祝连庆郑显通柳渊鹿利单张东亮 The school of opto-electronic engineering Changchun University of Science and TechnologyChangchun 130022China Key Laboratory of the Ministry of Education for optoelectronic Measurement Technology and instrument Beijing Information Science&Technology UniversityBeijing 100192China

We systematically investigate the influence of InSb interface(IF)engineering on the crystal quality and optical properties of strain-balanced InAs/GaSb type-Ⅱsuperlattices(T2SLs).The type-Ⅱsuperlattice structure is 120 periods InAs(8 ML)/GaSb(6 ML)with different thicknesses of InSb interface grown by molecular beam epitaxy(MBE).The highresolution x-ray diffraction(XRD)curves display sharp satellite peaks,and the narrow full width at half maximum(FWHM)of the 0th is only 30-39 *** high-resolution cross-sectional transmission electron microscopy(HRTEM)characterization,the InSb heterointerfaces and the clear spatial separation between the InAs and GaSb layers can be more intuitively *** the InSb interface thickness increases,the compressive strain increases,and the surface“bright spots”appear to be more apparent from the atomic force microscopy(AFM)***,photoluminescence(PL)measurements verify that,with the increase in the strain,the bandgap of the superlattice *** optimizing the InSb interface,a high-quality crystal with a well-defined surface and interface is obtained with a PL wavelength of 4.78μm,which can be used for mid-wave infrared(MWIR)detection.

关键词： InAs/GaSb type-Ⅱsuperlattice molecular beam epitaxy interface mid-wave infrared

Review of advanced progress ofχ^(2)-based all-optical devices on thin-film lithium niobate

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Chinese Optics Letters 2023年第10期21卷 79-92页

作者：石磊宋元军唐杰秦妍妍薛小枚周桓立陈泽贤李选钱广张晓阳张彤 Joint International Research Laboratory of Information Display and Visualization School of Electronic Science and EngineeringSoutheast UniversityNanjing 210096China National Key Laboratory of Solid-State Microwave Devices and Circuits Nanjing 210016China Nanjing electronic Devices Institute Nanjing 210016China Key Laboratory of Micro-Inertial instrument and Advanced Navigation Technology Ministry of Educationand School of Instrument Science and EngineeringSoutheast UniversityNanjing 210096China Suzhou Key Laboratory of Metal Nano-optoelectronic Technology Southeast University Suzhou CampusSuzhou 215123China

The technological innovation of thin-film lithium niobate(TFLN)is supplanting the traditional lithium niobate industry and generating a vast array of ultra-compact and low-loss optical waveguide devices,providing an unprecedented prospect for chip-scale integrated *** of its unique strong quadratic nonlinearity,TFLN is widely used to create new coherent light,which significantly promotes all-optical signal processes,especially in terms of ***,we review recent advances in TFLN,review the thorough optimization strategies of all-optical devices with unique characteristics based on TFLN,and discuss the challenges and perspectives of the developed nonlinear devices.

关键词： thin-film lithium niobate second-order nonlinearity nonlinear integrated optics

Biomechanical Analysis of a Radial Expansion Mechanism of Intestinal Robot Coupling with Hyperelastic Intestinal Wall

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Journal of Shanghai Jiaotong university(science) 2022年第4期27卷 552-560页

作者：刘大生颜国正 Department of instrument science and engineering School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai200240China Institute of Medical Robotics Shanghai Jiao Tong UniversityShanghai200240China

This paper proposes a new type of radial expansion mechanism by adopting the scissor type telescopic design for intestinal robot to meet the requirements of the intestinal robot’s movement and residence in the intestinal *** robot’s maximum expansion radius is up to 25mm,which can well adapt to the intestinal tract with different *** first,the mathematical model of the scissors-type telescopic mechanism(STM)is established to further study its dynamics characteristics by theoretical analysis and ***,in order to study the coupling effect between the STM and intestinal wall,the strain-energy function of Fung-type is used to establish the constitutive model of intestinal ***,aimed at solving the non-convergence problem caused by the selection of material parameters in general Fung-type model,the restrictions for selecting material parameters were given by using positive definite matrix ***,the motion coupling characteristics between the mechanism and intestinal wall were analyzed by using the finite element *** result shows that if the expansion radius of the STM exceeds a certain value,the intestinal wall may reach its deformation limit,which means that the maximum rotating angle of the three-claw butterfly disc of STM can be decided based on the maximum deformation stress of the intestinal ***,it provides a design basis for formulating a reasonable expansion radius in mechanism control to avoid damage to the intestinal wall.

关键词： radial expansion mechanism intestinal robot hyperelasticity constitutive model intestinal wall biomechanical analysis

Hybrid plasmon waveguide leveraging Bloch surface polaritons for sub-wavelength confinement

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science China Technological sciences 2013年第3期56卷 567-572页

作者： WAN YuHang ZHeng Zheng SHI XiaoGang BIAN YuSheng LIU JianSheng school of electronic and Information engineering Beihang University school of instrument and science and Optic-electronic engineering Beihang University

A novel hybrid plasmonic waveguide based on a guided Bloch surface polariton structure is proposed and *** hybrid waveguide overcomes the weak confinement in the Bloch surface polariton structure caused by the diffraction *** introducing a metal stripe near the dielectric ridge located on the periodic multilayer structure that is designed to support a TM polarized Bloch surface polariton,a sub-wavelength scale electric field confinement is *** coupling of the Bloch surface polariton and the surface plasmon polariton results in a strong field distribution within the gap between the metal stripe and the dielectric *** variation of the characteristic of the hybrid mode is revealed via tuning the height of the ridge and the coupling ***-wavelength scale mode size is realized as well as a propagation length of about 100μm.

关键词： Bloch surface wave plasmonic waveguide

Hierarchical fractal structure of perfect single-layer graphene

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Frontiers of Mechanical engineering 2013年第4期8卷 371-382页

作者： T.Zhang K.Ding Research Center for Solid Mechanics Beihang University school of engineering Brown University school of instrument science and opto-electronic engineering Beihang University

The atomic lattice structure of perfect singlelayer graphene that can actually be regarded as a kind of hierarchical fractal structure from the perspective of fractal geometry was studied for the first *** novel and special discoveries on hierarchical fractal structure and sets were unveiled upon examination of the regular crystal lattices of the single-layer *** interior fractaltype structure was discovered to be the fifth space-filling curve from physical *** efficient methods for calculating the fractal dimension of this fresh member was also *** outer boundary curve had a fractal dimension equal to one,and a multi-fractal structure from a naturally existing material was found for the first time.A series of strict self-similar hexagons comprised a rotating fractal *** hexagons slewed at a constant counterclockwise angle α of 19.1° when observed from one level to the next higher *** the perspective of fractal geometry,these pioneering discoveries added three new members to the existing regular fractal structures and sets.A fundamental example of a multi-fractal structure was also presented.

关键词： hierarchical fractal structure fractal dimension the fifth space-filling curve multi-fractal structure

Study on response of metal wire in thermoacoustic imaging

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Journal of Innovative Optical Health sciences 2022年第3期15卷 45-53页

作者： Zheng Liang Weipeng Wang Shuaiqi Qiao Lin Huang school of electronic science and engineering(National Exemplary school of Microelectronics)University of electronic science and Technology of China Chengdu 611731 P.R.China Center for Information in Medicine University of electronic and Technology of China Chengdu 611731 P.R.China

Thermoacoustic imaging(TAI)is an emerging high-resolution and high-contrast imaging *** recent years,metal wires have been used in TAI experiments to quantitatively evaluate the spatial resolution of different ***,there is still a lack of analysis of the response characteristics and principles of metal wires in *** theoretical and simulation analyses,this paper proposes that the response of metal(copper)wires during TAI is equivalent to the response of *** critically,the response of the copper wire is equivalent to the response of a half-wave dipole *** its length is close to half the wavelength of the incident electromagnetic wave,it obtains the best *** simulation,when the microwave excitation frequencies are 1.3 GHz,3.0 GHz,and 5.3 GHz,and the lengths of copper wires are separately set to 11 cm,5 cm,and 2.5 cm,the maximum SAR distribution and energy coupling effciency are *** result is connected with the best response of half-wave dipole antennas with lengths of 11 cm,4.77 cm,and 2.7 cm under the theoretical design,*** the further application,TAI can be used to conduct guided minimally invasive surgery on surgical instrument ***,this paper indicated that results can also guide the design of metal surgical instruments utilized in different microwave frequencies.

关键词： Thermoacoustic imaging simulation metal wire antenna

A flexible temperature sensing finger using optical fiber grating for soft robot application

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optoelectronics Letters 2021年第7期17卷 400-406页

作者：贺庆张青超 school of instrument science and opto-electronics engineering Beijing Information Science and Technology UniversityBeijing 100192China

Bionic perception, especially temperature-aware, is one of the important issues in soft robots research. This paper presents a method to implant temperature sensor network into soft robot finger by using optical fiber gratings. For avoiding strain disturbance, a dedicated metal tube is designed to package and protect the optical fiber gratings. For implanting the sensors firmly, a solution using two kinds of adhesive is proposed. The prototype is calibrated in high precision temperature bath and then measured under different temperatures and different bending conditions, respectively. The experimental results are compared with electronic temperature sensor(PT100 thermal resistance), which verifies the accuracy and repeatability of the design. With the dedicated coating and adhesive solution, the proposed temperature sensor network is suitable for implanting into soft robots for the temperature-aware ability.

关键词： PT100 robot application

Ultrahigh strain in textured BCZT-based lead-free ceramics with CuO sintering agent

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Journal of Materials science & Technology 2022年第22期117卷 207-214页

作者： Yingchun Liu Hongjun Zhang Wenming Shi Qian Wang Guicheng jiang Bin Yang Wenwu Cao Jiubin Tan Functional Materials and Acoustooptic instruments Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin 150080China Department of Mathematics and Materials Research Institute The Pennsylvania State Ultra-precision Optical&electronic instrument engineering Center Harbin Institute of TechnologyHarbin 150001China

Textured BaTiO_(3)(BT)-based lead-free ceramics have gained significant attention due to their high piezoelectric coefficient(d)and very large field induced strain(S).However,costly nano-size raw materials,excessively high sintering temperature and low Curie temperature(T_(c))hinder their device *** this work,highly[001]_(c)-oriented(Ba_(0.95)Ca_(0.05))(Zr_(0.04)Ti_(0.96))O_(3) ceramics with x mol%CuO(x=0.25,0.5,1.0,2.5)denoted as BCZT-x were synthesized by templated grain growth using micro-sized raw *** introduction of CuO sintering agent lowered the sintering temperature by 125℃ to 1450℃,and the BCZT-1.0 achieved a high texture degree of∼99%.In addition,the CuO-based liquid phases eliminated boundaries between BT templates and BCZT matrix *** liquid-phase sintering reduced sintering stresses,decreased the average grain size of BCZT-1.0 from 16μm down to 13μm,and increased the dielectric dispersion coefficientγto *** almost smoothed out T_(O-T) anomaly in the temperature dependence of dielectric permittivity and comparably high T_(c)(>102℃)lead to better temperature *** narrower grain orientation distribution with full width at half maximum(FWHM)of∼5.9°and smaller domains with the size of 0.1–0.5μm in width and 3–8μm in length were obtained,a high field induced maximum strain S_(max) of 0.38%and low H_(s) of 5.2%have been achieved in BCZT-1.0 textured ceramics together with a high and homogeneous piezoelectric stress coefficient d_(33)∼780 pC/N and very large d_(33)∗∼2950 pm/V.

关键词： Lead-free BCZT Textured ceramics Piezoelectric Strain hysteresis