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Unlocking the secrets of the invisible world:incredible deep optical imaging through in-silico clearing

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Light(Science & Applications) 2023年第8期12卷 1439-1440页

作者： Ting-Hui Xiao Yuqi Zhou keisuke goda Henan Key Laboratory of Diamond Optoelectronic Materials and Devices School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China Institute of Quantum Materials and Physics Henan Academy of SciencesZhengzhou 450046China Department of Chemistry School of ScienceThe University of TokyoTokyo 113-0033Japan institute of Technological Sciences Wuhan UniversityWuhan 430072China Department of Bioengineering University of CaliforniaLos AngelesCA 90095USA

In-silico clearing enables deep optical imaging of biological samples by correcting image blur caused by scattering and *** breakthrough method offers researchers unprecedented insights into three-dimensional biological systems,with enormous potential for advancing biology and medicine to better understand living organisms and human health.

关键词： clearing visible breakthrough

High-Q germanium optical nanocavity

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Photonics Research 2018年第9期6卷 925-928页

作者： TING-HUI XIAO ZIQIANG ZHAO WEN ZHOU MITSURU TAKENAKA HON Ki TSANG ZHENZHOU CHENG keisuke goda Department of Chemistry The University of TokyoTokyo 113-0033Japan Department of Electrical Engineering and Information Systems The University of TokyoTokyo 113-0033Japan Department of Electronic Engineering The Chinese University of Hong KongShatinHong Kong SARChina Department of Electrical Engineering University of CaliforniaLos AngelesCalifornia 90095USA

Mid-infrared(MIR) integrated photonics has attracted broad interest due to its promising applications in biochemical sensing, environmental monitoring, disease diagnosis, and optical communication. Among MIR integration platforms, germanium-based platforms hold many excellent properties, such as wide transparency windows, high refractive indices, and high nonlinear coefficients; however, the development of MIR germanium photonic devices is still in its infancy. Specifically, MIR high-Q germanium resonators with comparable performance to their silicon counterparts remain unprecedented. Here we experimentally demonstrate an MIR germanium nanocavity with a Q factor of ~18,000, the highest-to-date of reported nanocavities across MIR germanium-based integration platforms. This is achieved through a combination of a feasible theoretical design,Smart-Cut methods for wafer development, and optimized device fabrication processes. Our nanocavity, with its high Q factor and ultrasmall mode volume, opens new avenues for on-chip applications in the MIR spectral range.

关键词：薄膜热光性能通讯技术发展现状

Progress on mid-IR graphene photonics and biochemical applications

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Frontiers of Optoelectronics 2016年第2期9卷 259-269页

作者： Zhenzhou CHENG Changyuan QIN Fengqiu WANG Hao HE keisuke goda Department of Chemistry University of Tokyo Tokyo 113-0033 Japan School of Electronic Science and Engineering Nanjing University Nanjing 210023 China Med-X Research Institute School of Biomedical Engineering Shanghai Jiao Tong University Shanghai 200031 China Department of Electrical Engineering University of California Los Angeles 90095 USA Japan Science and Technology Agency Tokyo 102-0076 Japan

Mid-infrared （mid-IR）（2-20 μm） photonics has numerous chemical and biologic ＂fingerprint＂ sensing applications due to characteristic vibrational transitions of molecules in the mid-IR spectral region. Unfortunately, compared to visible light and telecommunication band wavelengths, photonic devices and applications have been difficult to develop at mid-IR wavelengths because of the intrinsic limitation of conventional materials. Breaking a new ground in the mid-IR science and technology calls for revolutionary materials. Graphene, a single atom layer of carbon arranged in a honey-comb lattice, has various promising optical and electrical properties because of its linear dispersion band structure and zero band gap features. In this review article, we discuss recent research develop- ments on mid-IR graphene photonics, in particular ultrafast lasers and photodetectors. Graphene-photonics-based biochemical applications, such as plasmonic sensing, photo- dynamic therapy, and florescence imaging are also reviewed.

关键词： mid-infrared (mid-IR) graphene lasers,photodetectors optical sensing and sensors photodynamictherapy spectroscopy fluorescence and luminescence

Ultrafast impulsive Raman spectroscopy across the terahertz-fingerprint region

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Advanced Photonics 2022年第1期4卷 80-91页

作者： Walker Peterson Julia Gala de Pablo Matthew Lindley Kotaro Hiramatsu keisuke goda The University of Tokyo School of ScienceDepartment of ChemistryTokyoJapan The University of Tokyo Research Center for SpectrochemistryTokyoJapan PRESTO Japan Science and Technology AgencySaitamaJapan Japan Science and Technology Agency TokyoJapan University of California Los AngelesDepartment of BioengineeringLos AngelesCaliforniaUnited States Wuhan University Institute of Technological SciencesWuhanChina

Broadband Raman spectroscopy(detection bandwidth>1000 cm^(−1))is a valuable and widely used tool for understanding samples via label-free measurements of their molecular *** important Raman spectral regions are the chemically specific“fingerprint”(200 to 1800 cm^(−1))and“low-frequency”or“terahertz”(THz)(500×enhancement of10×enhancement of fingerprint sensitivity above 1000 cm^(−1)compared with that of SE-ISRS.

关键词： optics photonics spectroscopy Raman spectroscopy terahertz

Ultrafast imaging for uncovering laser–material interaction dynamics

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International Journal of Mechanical System Dynamics 2022年第1期2卷 65-81页

作者： Du Wang Shubin Wei Xiandan Yuan Zhiyuan Liu Yueyun Weng Yuqi Zhou Ting‐Hui Xiao keisuke goda Sheng Liu Cheng Lei The Institute of Technological Sciences Wuhan UniversityWuhanChina The Key Laboratory of Transients in Hydraulic Machinery of Ministry of Education School of Power and Mechanical EngineeringWuhan UniversityWuhanChina Department of Chemistry University of TokyoTokyoJapan Department of Bioengineering University of CaliforniaLos AngelesCaliforniaUSA

The physical mechanism of the dynamics in laser–material interaction has been an important research *** addition to theoretical analysis,direct imaging‐based observation of ultrafast dynamic processes is an important approach to understand many fundamental issues in laser–material interaction such as inertial confinement fusion(ICF),laser accelerator construction,and advanced laser *** this review,the principles and applications of three types of commonly used ultrafast imaging methods are introduced,including the pump–probe,X‐ray diagnosis,and single‐shot optical burst *** focus on the technical features such as the spatial and temporal resolution for each technique,and present several conventional applications.

关键词： high‐energy‐density physics laser–material interaction laser processing ultrafast dynamics ultrafast imaging

High-speed hyperspectral imaging enabled by compressed sensing in time domain

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Advanced Photonics Nexus 2023年第2期2卷 112-118页

作者： Shigekazu Takizawa Kotaro Hiramatsu Matthew Lindley Julia Gala de Pablo Shunsuke Ono keisuke goda The University of Tokyo Department of ChemistryTokyoJapan The University of Tokyo Research Center for SpectrochemistryTokyoJapan Tokyo Institute of Technology School of ComputingDepartment of Computer ScienceTokyoJapan University of California Department of BioengineeringLos AngelesCaliforniaUnited States Wuhan University Institute of Technological SciencesWuhanChina

Hyperspectral imaging(HSI)is a powerful tool widely used for various scientific and industrial applications due to its ability to provide rich spatiospectral ***,in exchange for multiplex spectral information,its image acquisition rate is lower than that of conventional imaging,with up to a few *** particular,HSI in the infrared region and using nonlinear optical processes is impractically slow because the three-dimensional(3D)data cube must be scanned in a point-by-point *** this study,we demonstrate a framework to improve the spectral image acquisition rate of HSI by integrating time-domain HSI and compressed ***,we simulated broadband coherent Raman imaging at a record high frame rate of 25 frames per second(fps)with 100 pixels×100 pixels,which is 10×faster than that of previous work,based on an experimentally feasible sampling scheme utilizing 3D Lissajous scanning.

关键词： hyperspectral imaging Raman spectroscopy compressed sensing high-speed imaging

Ballistic resistance and energy dissipation of woven-fabric composite targets:Insights on the effects of projectile shape and obliquity angle

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Defence Technology（防务技术） 2023年第3期21卷 14-32页

作者： Ibrahim goda UniversitéBourgogne Franche-Comté FEMTO-ST InstituteDépartement Mécanique Appliquée24 Rue de L’Épitaphe25000BesançonFrance

This study aims at investigating the ballistic resistance and energy absorption in woven E-glass composite panels,considering different projectile nose shapes and oblique incidence *** that scope,three-dimensional finite element(FE)models of both projectiles and the laminated target are developed and numerical investigations are carried out using Abaqus Explicit *** composite damage model’s constitutive law encompasses nonlinear material response,material properties degradation,progressive failure,and an element deletion *** cohesive surface technique is used to represent the interface between two adjacent plies in the laminate,and the traction-separation law is used to characterize the behaviors of interlaminar degradation and *** responses attributable to fiber rupture,matrix cracking,and plasticity caused by micro-matrix cracking due to shear loading are taken into account with suitable damage evolution *** computational framework is first validated against the experimental results reported in the literature by performing ballistic impact tests on the target laminate with conical,hemispherical and blunt-ended projectile,and the numerical results showed a good comparison in terms of residual *** the framework is explored in simulating more complex failure mechanisms,with particular emphasis on the influence of the impact angle of obliquity,a parameter that is not usually analyzed in the *** that regard,the effects of normal and oblique impact on the damage morphologies and ballistic behavior of the fabric composite target in terms of energy absorption,impact contact force,and projectile residual velocity are conducted and analyzed,*** findings showed that the ballistic impact behavior of target composite is substantially influenced by projectile nose shape and incidence angle obliquity.

关键词： resistance cracking composite

Characteristics of horizontal ground motion measures along principal directions

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Earthquake Engineering and Engineering Vibration 2010年第1期9卷 9-22页

作者： K.goda Department of Civil and Environmental Engineering University of Western Ontario

Ground motion records are often used to develop ground motion prediction equations （GMPEs） for a randomly oriented horizontal component, and to assess the principal directions of ground motions based on the Arias intensity tensor or the orientation of the major response axis. The former is needed for seismic hazard assessment, whereas the latter can be important for assessing structural responses under multi-directional excitations. However, a comprehensive investigation of the pseudo-spectral acceleration （PSA） and of GMPEs conditioned on different axes is currently lacking. This study investigates the principal directions of strong ground motions and their relation to the orientation of the major response axis, statistics of the PSA along the principal directions on the horizontal plane, and correlation of the PSA along the principal directions on the horizontal plane. For these, three sets of strong ground motion records, including intraplate California earthquakes, inslab Mexican earthquakes, and interface Mexican earthquakes, are used. The results indicate that one of the principal directions could be considered as quasi-vertical. By focusing on seismic excitations on the horizontal plane, the statistics of the angles between the major response axis and the major principal axis are obtained; GMPEs along the principal axes are provided and compared with those obtained for a randomly oriented horizontal component; and statistical analysis of residuals associated with GMPEs along the principal directions is carried out.

关键词： Arias intensity attenuation relation bi-directional seismic excitation ground motion prediction equation principal direction pseudo-spectral acceleration response axis

ESTIMATION OF CHAIN REACTION BANKRUPTCY STRUCTURE BY CHANCE DISCOVERY METHO—WITH TIME ORDER METHOD AND DIRECTED KEYGRAPH

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Journal of Systems Science and Systems Engineering 2007年第4期16卷 489-498页

作者： Shinichi goda Yukio OHSAWA School of Engineering The University of Tokyo113-8656 Japan

Chain reaction bankruptcy is regarded as common phenomenon and its effect is to be taken into account when credit risk portfolio is analyzed. But consideration and modeling of its effect leave much room for improvement. That is mainly because method for grasping relations among companies with limited data is underdeveloped. In this article, chance discovery method is applied to estimate industrial relations that are to include companies＇ relations that transmit chain reaction of bankruptcy. Time order method and directed KeyGraph are newly introduced to distinguish and express the time order among defaults that is essential information for the analysis of chain reaction bankruptcy. The steps for the data analysis are introduced and result of example analysis with default data in Kyushu, Japan, 2005 is presented. The structure estimated by the new method is compared with the structure of actual account receivable holders of bankrupted companies for evaluation.

关键词： Chance discovery credit risk chain reaction bankruptcy