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Real-time high-resolution mid-infrared optical coherence tomography

Light(Science & Applications) 2019年第1期8卷 1076-1088页

作者： Niels M.Israelsen Christian R.Petersen Ajanta Barh Deepak Jain Mikkel Jensen Gunther Hannesschlager Peter Tidemand-Lichtenberg Christian Pedersen Adrian Podoleanu Ole Bang DTU Fotonik Technical University of Denmark2800 KgsLyngbyDenmark NORBLIS IVS Virumgade 35 DVirum 2830Denmark Research Center for Non-Destructive Testing(RECENDT) Altenberger Straße 694040 LinzAustria NLIR ApS Hirsemarken 1Farum 3520Denmark Applied Optics Group School of Physical SciencesUniversity of KentCanterbury CT27NHUK

The potential for improving the penetration depth of optical coherence tomography systems by using light sources with longer wavelengths has been known since the inception of the technique in the early ***,the development of mid-infrared optical coherence tomography has long been challenged by the maturity and fidelity of optical components in this spectral region,resulting in slow acquisition,low sensitivity,and poor axial *** this work,a mid-infrared spectral-domain optical coherence tomography system operating at a central wavelength of 4μm and an axial resolution of 8.6μm is *** system produces two-dimensional cross-sectional images in real time enabled by a high-brightness 0.9-to 4.7-μm mid-infrared supercontinuum source with a pulse repetition rate of 1 MHz for illumination and broadband upconversion of more than 1-μm bandwidth from 3.58–4.63μm to 820–865 nm,where a standard 800-nm spectrometer can be used for fast *** images produced by the mid-infrared system are compared with those delivered by a state-of-the-art ultra-high-resolution near-infrared optical coherence tomography system operating at 1.3μm,and the potential applications and samples suited for this technology are *** doing so,the first practical mid-infrared optical coherence tomography system is demonstrated,with immediate applications in real-time non-destructive testing for the inspection of defects and thickness measurements in samples that exhibit strong scattering at shorter wavelengths.

关键词： resolution repetition illumination

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Intrinsic in-plane nodal chain and generalized quaternion charge protected nodal link in photonics

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Light(Science & Applications) 2021年第5期10卷 881-889页

作者： Dongyang Wang Biao Yang Qinghua Guo Ruo-Yang Zhang Lingbo Xia Xiaoqiang Su Wen-Jie Chen Jiaguang Han Shuang Zhang C.T.Chan Department of Physics Hong Kong University of Science and TechnologyHong KongChina College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangshaChina Institute for Advanced Study Hong Kong University of Science and TechnologyHong KongChina Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education School of Physics and ElectronicsHunan UniversityChangshaChina Institute of Solid State Physics and Department of Physics Shanxi Datong UniversityDatongChina School of Physics&State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen UniversityGuangzhouChina Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Tianjin University and the Key Laboratory of Optoelectronics Information and Technology(Ministry of Education)TianjinChina School of Physics&Astronomy University of BirminghamBirminghamUK

Nodal lines are degeneracies formed by crossing bands in three-dimensional momentum ***,these degenerate lines can chain together via touching points and manifest as nodal *** nodal chains are usually embedded in two orthogonal planes and protected by the corresponding mirror ***,we propose and demonstrate an in-plane nodal chain in photonics,where all chained nodal lines coexist in a single mirror plane instead of two orthogonal *** lines are degeneracies formed by crossing bands in three-dimensional momentum ***,these degenerate lines can chain together via touching points and manifest as nodal *** nodal chains are usually embedded in two orthogonal planes and protected by the corresponding mirror ***,we propose and demonstrate an in-plane nodal chain in photonics,where all chained nodal lines coexist in a single mirror plane instead of two orthogonal *** chain point is stabilized by the intrinsic symmetry that is specific to electromagnetic waves at theГpoint of zero *** adding another mirror plane,we find a nodal ring that is constructed by two higher bands and links with the in-plane nodal *** nodal link in momentum space exhibits non-Abelian characteristics on a C_(2)T-invariant plane,where admissible transitions of the nodal link structure are determined by generalized quaternion *** near-field scanning measurements of bi-anisotropic metamaterials,we experimentally mapped out the in-plane nodal chain and nodal link in such *** chain point is stabilized by the intrinsic symmetry that is specific to electromagnetic waves at the r point of zero *** adding another mirror plane,we find a nodal ring that is constructed by two higher bands and links with the in-plane nodal *** nodal link in momentum space exhibits non-Abelian characteristics on a C2T-invariant plane,where admissible transitions of the nodal link structure are determ

关键词： nodal plane mirror

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Nonlinear frequency conversion in optical nanoantennas and metasurfaces:materials evolution and fabrication

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Opto-Electronic Advances 2018年第10期1卷 1-12页

作者： Mohsen Rahmani Giuseppe Leo Igal Brener Anatoly V. Zayats Stefan A. Maier Costantino De Angelis Hoe Tan Valerio Flavio Gili Fouad Karouta Rupert Oulton Kaushal Vora Mykhaylo Lysevych Isabelle Staude Lei Xu Andrey E. Miroshnichenko Chennupati Jagadish Dragomir N. Neshev Research School of Physics and Engineering The Australian National University Canberra ACT 2601 Australia Matériaux et Phénomènes Quantiques Université Paris Diderot-Sorbonne Paris Cité 10 rue A. Domon et L. Duquet 75013 Paris France Center for Integrated Nanotechnologies Sandia National Laboratories Albuquerque New Mexico 87185 United States Department of Physics King’s College London Strand London WC2R 2LS United Kingdom The Blackett Laboratory Department of Physics Imperial College London London SW7 2AZ United Kingdom Chair in Hybrid Nanosystems Nano Institute Munich Fakultat für Physik Ludwig-Maximilians-Universitat München München Germany Deptartment of Information Engineering Universitàdegli Studi di Brescia and INO-CNR Via Branze 38 25123 Brescia Italy Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena 07745 Jena Germany School of Engineering and Information Technology University of New South Wales Canberra ACT 2600 Australia

Nonlinear frequency conversion is one of the most fundamental processes in nonlinear *** has a wide range of applications in our daily lives,including novel light sources,sensing,and information *** is usually assumed that nonlinear frequency conversion requires large crystals that gradually accumulate a strong ***,the large size of nonlinear crystals is not compatible with the miniaturisation of modern photonic and optoelectronic ***,shrinking the nonlinear structures down to the nanoscale,while keeping favourable conversion efficiencies,is of great importance for future photonics *** the last decade,researchers have studied the strategies for enhancing the nonlinear efficiencies at the nanoscale,*** employing different nonlinear materials,resonant couplings and hybridization *** this paper,we provide a compact review of the nanomaterials-based efforts,ranging from metal to dielectric and semiconductor nanostructures,including their relevant nanofabrication techniques.

关键词： nonlinear nanophotonics metallic nanoantennas dielectric nanoantennas III-V semiconductor nanoantenna nanofabrication

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Non-Hermitian Skin Effect in a Non-Hermitian Electrical Circuit

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Research 2021年第1期2021卷 277-285页

作者： Shuo Liu Ruiwen Shao Shaojie Ma Lei Zhang Oubo You Haotian Wu Yuan Jiang Xiang Tie Jun Cui Shuang Zhang School of Physics and Astronomy University of BirminghamBirmingham B152TTUK State Key Laboratory of Millimeter Waves Southeast UniversityNanjing 210096China School of Physics and Electronics Hunan UniversityChangsha 410082China

The conventional bulk-boundary correspondence directly connects the number of topological edge states in a finite system with the topological invariant in the bulk band structure with periodic boundary condition(PBC).However,recent studies show that this principle fails in certain non-Hermitian systems with broken reciprocity,which stems from the non-Hermitian skin effect(NHSE)in the finite system where most of the eigenstates decay exponentially from the system *** this work,we experimentally demonstrate a 1D non-Hermitian topological circuit with broken reciprocity by utilizing the unidirectional coupling feature of the voltage follower *** topological edge state is observed at the boundary of an open circuit through an impedance spectra measurement between adjacent circuit *** confirm the inapplicability of the conventional bulk-boundary correspondence by comparing the circuit Laplacian between the periodic boundary condition(PBC)and open boundary condition(OBC).Instead,a recently proposed non-Bloch bulk-boundary condition based on a non-Bloch winding number faithfully predicts the number of topological edge states.

关键词： topological boundary system

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The Bulk-Surface Virtual Element Method for Reaction-Diffusion PDEs:Analysis and Applications

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Communications in Computational Physics 2023年第3期33卷 733-763页

作者： Massimo Frittelli Anotida Madzvamuse Ivonne Sgura Department of Mathematics and Physics“E.De Giorgi” University of SalentoVia per Arnesano73100 LecceItaly Department of Mathematics University of British Columbia1984 Mathematics RoadVancouverBC V6T 1Z2Canada Department of Mathematics School of Mathematical and Physical SciencesUniversity of SussexBrightonBN19QHUK Department of Mathematics and Applied Mathematics University of PretoriaPrivate Bag x 20Hatfield0028South Africa.

Bulk-surface partial differential equations(BS-PDEs)are prevalent in manyapplications such as cellular,developmental and plant biology as well as in engineeringand material *** numerical methods for BS-PDEs in three space dimensions(3D)are *** this work,we present a bulk-surface virtual elementmethod(BS-VEM)for bulk-surface reaction-diffusion systems,a form of semilinearparabolic BS-PDEs in *** previous studies in two space dimensions(2D),the3D bulk is approximated with general polyhedra,whose outer faces constitute a flatpolygonal approximation of the *** this reason,the method is restricted tothe lowest order case where the geometric error is not *** BS-VEM guaranteesall the advantages of polyhedral methods such as easy mesh generation andfast matrix assembly on general *** advantages are much more relevantthan in *** allowing for general polyhedra,general nonlinear reaction kineticsand general surface curvature,the method only relies on nodal values without needingadditional evaluations usually associated with the quadrature of general *** latter is particularly costly in *** BS-VEM as implemented in thisstudy retains optimal convergence of second order in space.

关键词： Bulk-surface PDEs bulk-surface reaction-diffusion systems polyhedral meshes bulksurface virtual element method convergence.

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Synthesis and Characterization of WS_(2) Inorganic Nanotubes with Encapsulated/Intercalated CsI

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Nano Research 2010年第3期3卷 170-173页

作者： Sung You Hong Ronit Popovitz-Biro Gerard Tobias Belén Ballesteros Benjamin G.Davis Malcolm L.H.Green Reshef Tenne Department of Chemistry Chemistry Research LaboratoryUniversity of OxfordMansfield RoadOxfordOX13TAUK Electron Microscopy Unit Weizmann Institute of ScienceRehovot 76100Israel Inorganic Chemistry Laboratory University of OxfordSouth Parks RoadOxfordOX13QRUK Department of Materials and Interfaces Weizmann Institute of ScienceRehovot 76100Israel

WS2 nanotubes have been filled and intercalated by molten phase caesium *** presence of caesium iodide inside the WS_(2) nanotubes has been determined using high-resolution transmission electron microscopy(HRTEM)coupled with electron energy-loss spectroscopy(EELS)and energy-dispersive X-ray spectroscopy(EDS).Noticeably,a Moirépattern was observed due to the interference between encapsulated CsI and WS_(2) *** intercalation of CsI into the host concentric WS2 lattices resulted in an increase in the interplanar spacing.

关键词： Inorganic nanotubes transmission electron microscopy intercalation encapsulation

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随机方程的截断方法综述

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安徽工程大学学报 2020年第1期35卷 1-11页

作者：刘暐毛学荣上海师范大学数理学院上海200234 斯克莱德大学数学与统计系英国

截断的Euler-Maruyama方法最初由毛学荣提出,相关论文2015年发表于《***》。在此之后,众多论文参考这种截断的思想针对不同种类随机方程的构造多种数值格式。鉴于该类方法近年来的蓬勃发展,我们觉得有必要写一篇综述来总结各位学者在该... 详细信息

截断的Euler-Maruyama方法最初由毛学荣提出,相关论文2015年发表于《***》。在此之后,众多论文参考这种截断的思想针对不同种类随机方程的构造多种数值格式。鉴于该类方法近年来的蓬勃发展,我们觉得有必要写一篇综述来总结各位学者在该方向的最新研究成果。与此同时,我们也提出来一些亟待解决的开放问题。

关键词：随机微分方程超线性增长系数截断的方法显式方法

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Study of disorder in pulsed laser deposited double perovskite oxides by first-principle structure prediction

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npj Computational Materials 2021年第1期7卷 826-833页

作者： Edoardo Fertitta Sujit Das Debalina Banerjee Farbod Ebrahimi Clément Barraud Kai Du He Tian Chris J.Pickard Cedric Weber Ramamoorthy Ramesh Peter Littlewood David Dubbink Happy Electron Ltd. LondonUnited Kingdom Department of Materials Science and Engineering University of CaliforniaBerkeleyCAUSA Department of Physics King’s College LondonLondonUnited Kingdom Laboratoire Matériaux et Phénomènes Quantiques UMR 7162Universitéde ParisCNRSParisFrance Center of Electron Microscopy School of Materials Science and EngineeringZhejiang UniversityHangzhouChina Department of Materials Science and Metallurgy CambridgeUnited Kingdom Advanced Institute for Materials Research Tohoku UniversitySendaiJapan Department of Physics James Franck InstituteUniversity of ChicagoChicagoILUSA

Double perovskite oxides,with generalized formula A_(2)BB'O_(6),attract wide interest due to their multiferroic and charge transfer *** offer a wide range of potential applications such as spintronics and electrically tunable ***,great practical limitations are encountered,since a spontaneous order of the B-site cations is notoriously hard to *** this joint experimental-theoretical work,we focused on the characterization of double perovskites La2TiFeO6 and La_(2)VCuO_(6) films grown by pulsed laser deposition and interpretation of the observed B-site disorder and partial charge transfer between the B-site ions.A random structure sampling method was used to show that several phases compete due to their corresponding configurational *** order to capture a representative picture of the most relevant competing microstates in realistic experimental conditions,this search included the potential formation of non-stoichiometric phases as well,which could also be directly related to the observed partial charge *** optimized the information encapsulated in the potential energy landscape,captured via structure sampling,by evaluating both enthalpic and entropic *** terms were employed as a metric for the competition of different *** approach,applied herein specifically to La_(2)TiFeO_(6),highlights the presence of highly entropic phases above the ground state which can explain the disorder observed frequently in the broader class of double perovskite oxides.

关键词： laser double structure

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Electrically-pumped compact topological bulk lasers driven by band-inverted bound states in the continuum

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Light(Science & Applications) 2023年第7期12卷 1337-1345页

作者： Song Han Jieyuan Cui Yunda Chua Yongquan Zeng Liangxing Hu Mingjin Dai Fakun Wang Fangyuan Sun Song Zhu Lianhe Li Alexander Giles Davies Edmund Harold Linfield Chuan Seng Tan Yuri kivshar Qi Jie Wang Centre for Optoelectronics and Biophotonics School of Electrical and Electronic Engineering&The Photonics InstituteNanyang Technological UniversitySingaporeSingapore Electronic Information School Wuhan UniversityWuhanChina school of Electronic and Electrical Engineering University of LeedsLeedsUK Nonlinear Physics Center Research School of PhysicsAustralian National UniversityCanberraACT 2601Australia Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingaporeSingapore

One of the most exciting breakthroughs in physics is the concept of topology that was recently introduced to photonics,achieving robust functionalities,as manifested in the recently demonstrated topological ***,so far almost all attention was focused on lasing from topological edge *** bands that reflect the topological bulk-edge correspondence have been largely ***,we demonstrate an electrically pumped topological bulk quantum cascade laser(QCL)operating in the terahertz(THz)frequency *** addition to the band-inversion induced in-plane reflection due to topological nontrivial cavity surrounded by a trivial domain,we further illustrate the band edges of such topological bulk lasers are recognized as the bound states in the continuum(BiCs)due to their nonradiative characteristics and robust topological polarization charges in the momentum ***,the lasing modes show both in-plane and out-of-plane tight confinements in a compact laser cavity(lateral size~3λ_(laser)).Experimentally,we realize a miniaturized THz QCL that shows single-mode lasing with a side-mode suppression ratio(SMSR)around 20 *** also observe a cylindrical vector beam for the far-field emission,which is evidence for topological bulk BIC *** demonstration on miniaturization of single-mode beam-engineered THz lasers is promising for many applications including imaging,sensing,and communications.

关键词： pumped polarization lasing

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Fluorescent probes for the detection of disease-associated biomarkers

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Science Bulletin 2022年第8期67卷 853-878,M0004页

作者： Wei-Tao Dou Hai-Hao Han Adam C.Sedgwick Guo-Biao Zhu Yi Zang Xin-Rong Yang Juyoung Yoon Tony D.James Jia Li Xiao-Peng He Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research CenterFrontiers Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China National Center for Drug Screening State Key Laboratory of Drug ResearchShanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China Department of Liver Surgery&Transplantation Liver Cancer InstituteZhongshan HospitalFudan UniversityKey Laboratory of Carcinogenesis and Cancer InvasionMinistry of EducationShanghai 200032China Department of Chemistry University of BathBath BA27AYUK Department of Chemistry and Nanoscience Ewha Womans UniversitySeoul 03760Republic of Korea Department of Chemistry The University of Texas at AustinAustinTX 78712-1224USA School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007China

Fluorescent probes have emerged as indispensable chemical tools to the field of chemical biology and *** ability to detect intracellular species and monitor physiological processes has not only advanced our knowledge in biology but has provided new approaches towards disease *** this review,we detail the design criteria and strategies for some recently reported fluorescent probes that can detect a wide range of biologically important species in cells and in *** doing so,we highlight the importance of each biological species and their role in biological systems and for disease *** then discuss the current problems and challenges of existing technologies and provide our perspective on the future directions of the research ***,we hope this review will provide inspiration for researchers and prove as useful guide for the development of the next generation of fluorescent probes.

关键词： Fluorescent probes Fluorescence imaging Biomarker detection Chemical biology

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