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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)*** an example,we study the reflectance of few-layered black phosphorus(BP)in the total internal reflection(TIR)mode in *** 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 *** 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 *** 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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Orientation Angle of Molecules at Hexadecane-Water Interface Studied with total internal reflection Second Harmonic Generation

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Chinese Journal of Chemical Physics 2016年第6期29卷 650-656,I0001页

作者： Li-bo Zhang Hui Fang Shun-li Chen Xue-feng Zhu Wei Gan LaboratoryofEnvironmentalScienceandTechnology TheXinjiangTechnicalInstituteofPhysicsChemistryKeyLaboratoryofFunctionalMaterialsandDevicesforSpecialEnvironmentsChineseAcademyofSciencesUrumqi830011China UniversityofChineseAcademyofSciences Beijing100049China

The orientation angle is an important parameter that reflects the structure of molecules at interfaces. In order to obtain this parameter, second order nonlinear spectroscopic techniques including second harmonic generation （SHG） and sum frequency generation-vibrational spec- troscopy （SFG-VS） have been successfully applied through analysis of the nonlinear signal from various polarizations. In some SHG and SFG-VS experiments, total internal reflection （TIR） configuration has been adopted to get enhanced signals. However, the reports on the detailed procedure of the polarization analysis and the calculation of the orientation angle of interracial molecules under TIR configuration are still very few. In this paper, we mea- sured the orientation angles of two molecules at the hexadecane-water interface under TIR and Non-TIR experimental configurations. The results measured from polarization analysis in TIR configuration consist with those obtained from Non-TIR configuration. This work demonstrates the feasibility and accuracy of polarization analysis in the determination of the orientation angle of molecules at the interfaces under TIR-SHG configuration.

关键词： Second harmonic generation total internal reflection Hyperpolarizability Polarization Orientation angle

total internal reflection-based Extinction Spectroscopy of Single Nanoparticles

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

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

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 *** capabilities were enabled via evanescent wave illumination which gave a dramatically improved reflectance change(ΔI/I) up to tens of *** detection limit of TIRES was down to 28-nm gold nanoparticle and 57-nm polystyrene *** 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 *** 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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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 *** out-of-focus image consists of fringes,the spacing of which reflects the interference between the surface-reflected light and the twofold-refracted *** internal reflection occurs when the incident light hits the bubble at a large incident *** tunneling phase shift is not included in the geometric optics approximation,which leads to a deviation from Mie *** this work,we modified the formula for describing the fringe spacing by including the tunneling phase shift of total internal *** 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

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 430074 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.

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

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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 *** particular focus of this review is on the possibility of homogeneous topological charge formation in the ultra-wide spectral interval inherent to ultrashort terahertz *** 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

Sensitivity enhancement of guided mode resonance sensors under oblique incidence

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Photonics Research 2024年第11期12卷 2667-2675页

作者： LIANG GUO LEI XU LIYING LIU Key Laboratory for Micro and Nanophotonic Structures (Ministry of Education) Department of Optical Science and EngineeringSchool of Information Science and Engineering Fudan University

The sensitivity of guided mode resonance (GMR) sensors is significantly enhanced under oblique incidence. Here in this work, we developed a simplified theoretical model to provide analytical solutions and reveal the mechanism of sensitivity enhancement. We found that the sensitivity under oblique incidence consists of two contributions, the grating sensitivity and waveguide sensitivity, while under normal incidence, only waveguide sensitivity exists. When the two contributions are constructively superposed, as in the case of positive first order diffraction of the grating, the total sensitivity is enhanced. On the other hand, when the two parts are destructively superposed, as in the case of negative first order diffraction, the total sensitivity decreases. The findings are further supported by FDTD numerical calculations and proof-of-concept experiments.?2024 Chinese Laser Press

关键词： Diffraction gratings Effective refractive index Holographic gratings total internal reflection Waveguide gratings Waveguide modes

Emission Characteristics of the Side Radiation of Excited of the Layer of Alcohol Solution of Rhodamine 6G with the Round Geometric Shape

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Optics and Photonics Journal 2023年第12期13卷 251-258页

作者： Zurab V. Wardosanidze Vladimer Chavchanidze Institute of Cybernetics of the Georgian Technical University Tbilisi Georgia

The spectral-spatial characteristics of the lateral radiation of a circular-shaped Rhodamine 6G solution layer were investigated. The layer is a part of the laser dye solution, which is in optical contact with the bottom of optical cylindrical cell, the shape of which determines the geometric shape of the exciting layer. Homogeneous excitation of this layer by the second harmonic of the Nd+: YAG (λ = 532 nm) laser is realized. Circular, plane-directed radiation, with a small, vertical, divergence was obtained from the edges of the excited layer. Is investigated experimentally the spectral and spatial characteristics of radiation. Excitation of the layer was performed from the side of the cuvette bottom. It turned out that within the concentrations of the dye in the solution from 0.12 to 0.03 wt%, the following processes are observed: 1) Plane-directed radiation, with a small vertical divergence, uniform in intensity, around the optical cell in the plane of the luminescent layer;2) An increase in the amplitude of radiation pulses with a decrease in the concentration of the dye in the solution;3) Shifting of the maximum of the emission spectrum to the short-wave region, significant narrowing of the radiation spectrum and decrease of the vertical divergence of radiation.

关键词： Light-Excitation Superluminescence Superradiance Light Divergence Spectral Selectivity total internal reflection Lasing