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Optical anisotropy of black phosphorus by total internal reflection

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Nano Materials Science 2019年第4期1卷 304-309页

作者： Wei Xin Hao Bo Jiang Teng Qian Sun Xiao Guang Gao Shao Nan Chen Bo Zhao Jian Jun Yang Zhi Bo Liu Jian Guo Tian Chun Lei Guo The Guo China-U.S.Photonics Lab State Key Laboratory of Applied OpticsChangchun Institute of OpticsFine Mechanicsand PhysicsChangchun130033China The Key Laboratory of Weak Light Nonlinear Photonics Ministry of EducationTeda Applied Physics InstituteAnd School of PhysicsNankai UniversityTianjin300071China The Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchun130023China The Institute of Optics University of RochesterRochesterNY14627USA

Although abundant research on the anisotropy of van der Waals(vd W)materials has been published,we undertake an in-depth study of their optical properties as they have an important guiding role for light control in two-dimensional(2D)nanospace.As an example,we study the reflectance of few-layered black phosphorus(BP)in the total internal reflection(TIR)mode in detail.We demonstrate that its optical anisotropy can be changed on a large scale by varying the incident angles,polarization states,and the in-plane rotation angles of the BP samples.Theoretical analysis indicates that the phenomena observed are common to all the atom-thick biaxial crystals,so these conclusions can be widely applied to other anisotropic 2D materials.This research furthers the current understanding of the properties of BP more comprehensively,and provides guidance for developing new optoelectronic applications,especially when BP and other atom-thick biaxial crystals are integrated with TIR devices.

关键词： Black phosphorus Optical anisotropy total internal reflection Biaxial crystal

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total internal reflection-based Extinction Spectroscopy of Single Nanoparticles

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Total Internal Reflection-based Extinction Spectroscopy of S...

Design of broadband terahertz vector and vortex beams: I. Review of materials and components

第二十届全国光散射学术会议（CNCLS20）

作者： Tinglian Yuan Wei Wang State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing University

Recently,we reported the wide-field total internal reflection-based extinction spectroscopy(TIRES) to measure extinction spectra of individual dielectric,plasmonic or light-absorbing nano-object.These capabilities were enabled via evanescent wave illumination which gave a dramatically improved reflectance change(ΔI/I) up to tens of percent.The detection limit of TIRES was down to 28-nm gold nanoparticle and 57-nm polystyrene nanosphere.It was further surprisingly found that the scattering and absorption of light contributes to the bright and dark centroids,respectively,in the wavelength-dependent TIR images of a nanoparticle,allowing for distinguishing the two components from the total extinction output.The present work not only provides a novel tool for single nanoparticle imaging and spectroscopy,but also holds great potential in studying anisotropic nanomaterials with the unique incidence– and polarization-tunable features.

关键词： single nanoparticle spectroscopy extinction spectroscopy total internal reflection

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Light(Advanced Manufacturing) 2022年第4期3卷 126-144页

作者： Nikolay V.Petrov Bogdan Sokolenko Maksim S.Kulya Andrei Gorodetsky Aleksey V.Chernykh Digital and Display Holography Laboratory ITMO UniversitySt.Petersburg 197101Russia V.I.Vernadsky Crimean Federal University Simferopol 295007Russia School of Physics and Astronomy University of BirminghamBirmingham B152TTUK

In this paper,we review the existing approaches for vortex and vector beam shaping and generation in the terahertz frequency range.The particular focus of this review is on the possibility of homogeneous topological charge formation in the ultra-wide spectral interval inherent to ultrashort terahertz pulses.We review the available materials and components,analyse proposed and potentially possible solutions for broadband terahertz vortex and vector beam shaping,compare all developed approaches,and put forward a unified concept for constructing passive shapers of such beams from the existing component base.

关键词： Terahertz radiation Vortex beams Vector beams Achromatic wave plates Broadband terahertz radiation Digital holography Terahertz holography total internal reflection Metasurface THz liquid crystals Geometric phase

Dynamic tracking and mobility analysis of single GLUT4 storage vesicle in live 3T3-L1 cells

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Cell Research 2004年第6期14卷 480-486页

作者： Chen Hong LI, Li BAI, Dong Dong LI, Sheng XIA, Tao XU Institute of Biophysics and Biochemistry, Huazhong University of Science and Technology, Wuhan 430074, China National Key Laboratory of Biomacromoleculars, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China Institute of Biophysics and Biochemistry Huazhong University of Science and Technology Wuhan China National Key Laboratory of Biomacromoleculars Institute of Biophysics Chinese Academy of Sciences Beijing China

Glucose transporter 4 (GLUT4) is responsible for insulin-stimulated glucose transporting into the insulin-sensitive fat and muscle cells. The dynamics of GLUT4 storage vesicles (GSVs) remains to be explored and it is unclear how GSVs are arranged based on their mobility. We examined this issue in 3T3-L1 cells via investigating the three-dimensional mobility of single GSV labeled with EGFP-fused GLUT4. A thin layer of cytosol right adjacent to the plasma membrane was illuminated and successively imaged at 5 Hz under a total internal reflection fluorescence microscope with a penetration depth of 136 nm. Employing single particle tracking, the three-dimensional subpixel displacement of single GSV was tracked at a spatial precision of 22 nm. Both the mean square displacement and the diffusion coefficient were calculated for each vesicle. Tracking results revealed that vesicles moved as if restricted within a cage that has a mean radius of 160 nm, suggesting the presence of some intracellular tethering matrix

关键词： Insulin GLUT4 GLUT4 storage vesicle (GSV) 3T3-L1 total internal reflection fluorescence microscopy single particle tracking.

A measurement method for distinguishing the real contact area of rough surfaces of transparent solids using improved Otsu technique

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Chinese Physics B 2015年第1期24卷 354-360页

作者：宋保江阎绍泽向吴维凯 State Key Laboratory of Tribology Department of Mechanical Engineering Tsinghua University

An experimental method of measuring the real contact area of transparent blocks based on the principle of total internal reflection is presented, intending to support the investigation of friction characteristics, heat conduction, and energy dissipation at the contact interface. A laser sheet illuminates the contact interface, and the transmitted laser sheet is projected onto a screen. Then the contact information is acquired from the screen by a camera. An improved Otsu method is proposed to process the data of experimental images. It can compute the threshold of the overall image and filter out all the pixels one by one. Through analyzing the experimental results, we describe the relationship between the real contact area and the positive pressure during a continuous loading process, at different loading rates, with the polymethyl methacrylate（PMMA）material. A hysteresis phenomenon in the relationship between the real contact area and the positive pressure is found and explained.

关键词： real contact area total internal reflection improved Otsu method hysteresis phenomenon

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Inclusion of the tunneling phase shift for interferometric particle imaging for bubble sizing

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Particuology 2021年第1期19卷 50-57页

作者： Xiang Liu Jianqi Shen Peng Gong Haitao Yu College of Science University of Shanghai for Science and TechnologyShanghai 200093China

The interferometric particle imaging technique makes use of the angular oscillations of the scattered light in the forward direction for droplet or bubble sizing.The out-of-focus image consists of fringes,the spacing of which reflects the interference between the surface-reflected light and the twofold-refracted light.total internal reflection occurs when the incident light hits the bubble at a large incident angle.The tunneling phase shift is not included in the geometric optics approximation,which leads to a deviation from Mie theory.In this work,we modified the formula for describing the fringe spacing by including the tunneling phase shift of total internal reflection.Numerical analysis and experiments showed that the modification is effective for the measurement of bubbles smaller than 60μm.

关键词： Interferometric particle imaging Bubbles total internal reflection Tunneling phase shift