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Chinese Physics B 2022年第2期31卷 372-379页

作者： Xiangxian Wang Jian Zhang Jiankai Zhu Zao Yi Jianli Yu School of Science Lanzhou University of TechnologyLanzhou 730050China Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621010China School of Electronic Engineering Chaohu UniversityChaohu 238000China

We propose a hybrid structure of a nano-cube array coupled with multilayer full-dielectric thin films for refractive index *** this structure,discrete states generated by two-dimensional grating and continuous states generated by a photonic crystal were coupled at a specific wavelength to form two Fano *** transmission spectra and electric field distributions of the structure were obtained via the finite-difference time-domain *** obtained the optimal structural parameters after optimizing the geometrical *** the optimal parameters,the figure of merit(FOM)values of the two Fano resonances reached 1.7×10^(4)and 3.9×10^(3),*** results indicate that the proposed structure can achieve high FOM refractive index sensing,thus offering extensive application prospects in the biological and chemical fields.

关键词： Fano resonance refractive index nano-cube array all-dielectric film

refractive index characteristics of edible oils based on spectrometry and effects of oil dispersion on OCT

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Journal of Innovative Optical Health Sciences 2021年第1期4卷 100-111页

作者： ShiJun Xu XiaoKang Li School of Science Xi'an Technological University Xi'an 710021P.R.China

It is necessary to investigate the wavelength-dependent variation rules of the refractive index of edible oils so as to explore the specificity of the dispersion in light propagation,imaging,and interference processes among different types of edible oil *** this study,by deriving the refractive index equations of the double glass sheet holding device and oil,the reflectance spectra of three different types of oil samples,namely,peanut oil,colza oil,and kitchen waste oil,were measured via a ***,the refractive index model of these different types of oil samples was ***,based on the oil dispersion characteristics,the dis-persion of oil in optical coherence tomography(OCT)was compensated via *** the wavelength range of λ∈(380,1500)nm,the analytical expressions of the double glass sheet holding device and oils are featured by practical *** refractive indexes of three different types of oils n∈(1.38,1.52)show normal dispersion *** Cauchy co-efficient matrix of the oil refractive index can be used for oil identification;in particular,the healthy oil and waste oil differ significantly in terms of the Cauchy coefficient matrix in the infrared *** dispersion has almost no influence on the phase spectra of oils but can enhance their amplitude *** dispersion mismatch can be eliminated by calculating the convo-lution *** envelope broadening factors of OCT interference signals of oil products are 0.84,0.64,and 0.91,*** to the present research results,the refractive index model of oil can effectively remove the influence of the holding *** refractive indexes of three different types of oil samples show similar wavelength-dependent variation characteristics,which confirms the existence of many correlated components in these oil *** established refractive index model of oil in a wide spectral range,from the ultraviolet to the infrared band

关键词： Biological optics refractive index spectrometer edible oil dispersion OCT

Retrieval of refractive index of ultrafine single particle using hygroscopic growth factor obtained by high sensitive surface plasmon resonance microscopy

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Journal of Environmental Sciences 2023年第4期126卷 483-493页

作者： Bo Yang Jianguo Liu Zhibo Xie Jiaoshi Zhang Xiuli Wei Yixin Yang DexiaWu Huaqiao Gui Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China CAS Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China

When exposed to different relative humidities (RHs),the optical properties of atmospheric aerosols will change because of changes in the aerosol particle size and complex refractive index (RI),which will affect haze formation and global climate *** potential contributions of ultrafine particles to the atmospheric optical characteristics and to haze spreading cannot be ignored because of their high particle number concentrations and strong diffusibility;measurement of the optical properties of wet ultrafine particles is thus highly important for environmental ***,a surface plasmon resonance microscopy with azimuthal rotation illumination (SPRM-ARI) system is designed to determine the RIs of single particle aerosols with diameters of less than 100 nm in the hygroscopic growth *** are taken using mixed single particles with different mass *** RIs of mixed single aerosols at different RHs are retrieved by measuring the scattering light intensity using the SPRM-ARI system and almost all the RIs of the bicomponent particles with different mass ratios decrease with increasing water content under high RH ***,for each of the bicomponent particles,the maximum standard deviations for the retrieved RI values are only 2.06×10^(-3),3.08×10^(-3)and 3.83×10^(-3),corresponding to the NaCl and NaNO_(3)bicomponent particles with a 3:1 mass ratio at 76.0%RH,the NaCl and glucose particles with a 1:3 mass ratio at 89.0%RH,and the NaCl and OA particles with a 1:1 mass ratio at 78.0%RH,respectively;these results indicate that the high-sensitivity SPRM-ARI system can measure the RI effectively and accurately.

关键词： refractive index Ultrafine single particle Hygroscopic growth factor Surface plasmon resonance High-sensitivity

Ultra wide sensing range plasmonic refractive index sensor based on nano-array with rhombus particles

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Chinese Physics B 2020年第11期29卷 330-335页

作者： Jiankai Zhu Xiangxian Wang Xiaoxiong Wu Yingwen Su Yueqi Xu Yunping Qi Liping Zhang Hua Yang School of Science Lanzhou University of TechnologyLanzhou 730050China College of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070China

We propose a two-dimensional metal grating with rhombus particles on a gold film structure for refractive index sensing due to its perfect absorption at near-infrared *** two-dimensional metal grating coupling,the incident light energy is effectively transformed into the surface plasmons which propagate along the upper surface of the gold film and interact with the surrounding environment in a wide *** plasmonic resonance mechanism of the structure is discussed in detail by theoretical analysis and finite-difference time-domain *** optimizing the geometrical parameters,the designed structure shows the sensing performance with a refractive index sensitivity of 1006 nm/*** importantly,this plasmonic refractive index sensor achieves an ultra wide refractive index sensing range from 1.0 to 2.4 with a stable sensing *** promising simulation results of the structure show that the sensor has a broad application prospect in the field of biology and chemistry.

关键词： plasmonic sensor refractive index sensitivity figure of merit(FOM)

As_2S_8 planar waveguide:refractive index changes following an annealing and irradiation and annealing cycle,and light propagation features

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Journal of Semiconductors 2011年第11期32卷 18-23页

作者：邹林儿王国日沈云陈抱雪矶守 Department of Physics Nanchang University School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Department of Chemical Engineering Tokyo University of Agriculture and Technology

The refractive index ofas-evaporatedamorphous semiconductor As2S8 film upon an annealing and saturation irradiation and annealing cycle is reversible. Upon successive treatment with annealing and non-saturation irradiation and further annealing, the refractive index of the as-evaporated amorphous semiconductor As2S8 film reaches a maximum value and then its reversibility occurs upon annealing. The annealing of the amorphous semiconductor AS2S8 films results in the stabilization of the structure through changes of the S-S bonds in the nearest environment, accompanied by a decrease of film thickness. The As2S8 planar waveguide after annealing （130 ℃） and saturation irradiation and annealing （130 ℃） shows a good propagation characteristic with ca, 0.27 dB/cm low propagation loss of the 632.8 nm guided mode.

关键词： amorphous semiconductor chalcogenide As2S8 waveguide refractive index light propagation

FABRICATION OF TRANSPARENT PU/ZrO_2 NANOCOMPOSITE COATINGS WITH HIGH refractive index

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Chinese Journal of Polymer Science 2010年第1期28卷 13-20页

作者：徐坤 Department of Materials Science and Advanced Coatings Research Center of Ministry of Education ChinaFudan University

Transparent ZrO2-polyurethane nanocomposites with high refractive index were prepared by dispersing ZrO2 nanoparticles in a polyurethane matrix via ligand molecule engineering. TEM showed that the inorganic particles were well dispersed within the polymeric network with no significant macroscopic agglomeration. By controlling the phase separation it was possible to obtain transparent zirconia nanostructured coatings, characterized by improved mechanical and thermal properties. UV-Vis spectra indicated that the coatings still maintained transparency in the visible light. The refractive index of the UV-cured films depends linearly on the ZrO2 content and varies from 1.475 to 1.625 （20 wt%） at 633 nm. These coatings could find advanced applications in coatings of optical and electronic devices.

关键词： Coatings Nanocomposites Photopolymerization refractive index ZrO2

Predictive methods for density and refractive index of naphthenic lubricating oils during solvent extraction process

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Petroleum Science 2023年第3期20卷 1934-1946页

作者： Xiao-Ling Xu Tian-Qi Wang Guang-Huai Chen Jun-Wei Hou Yan-Sheng Liu State Key Laboratory of Heavy Oil Processing China University of Petroleum(Bejing)at KaramayKaramayXinjiang834000China State Key Laboratory of Heavy oil Processing China University of Petroleum(Bejing)Bejing102200China

Lubricating oils are usually produced by solvent extraction to separate aromatics in order to achieve the desired specifications and better quality *** the different properties of lubricating oils,density and refractive index are some of the most important properties which can both be used for petroleum fluid *** of density and refractive index for naphthenic oils during solvent extraction by DMSO obtained by the pseudo-component approach and the quadratic correlation were both *** pseudo-component approach is a method to predict density and refractive index from composition while the latter merely relates density to refractive *** indicated that the predictions yielded by the pseudo-component method were in good agreement with experimental data for naphthenic *** the use of a function of refractive index(FRI_(20))as a pseudo-component property remarkably improved n_(20)predictions for the naphthenic ***,the density and refractive index predictions obtained by the quadratic correlation exhibited significantly higher de-viations for naphthenic oils than those for paraffinic *** a new modified correlation of the same functional form was proposed for naphthenic *** modification significantly improved predictions for naphthenic oils,which presented similar accuracy as the pseudo-component *** the previous correlation was still used for paraffinic ***,effect of temperature on density and refractive index of naphthenic oils was *** showed that the modified quadratic correlation was accurate for describing the relationship between density and refractive index of naphthenic oils at 20-90℃.The temperature dependence of density and refractive index for the raffinates and the extracts could be accurately described by the thermal coefficients for saturates and aromatics,*** the refractive index variation of the extracts with temperature,the

关键词： Density refractive index Pseudo-components Paraffinic lubricating oils Naphthenic lubricating oils Solvent extraction

Optofluidic refractive index Sensor Based on Partial Reflection

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Photonic Sensors 2017年第2期7卷 97-104页

作者： Lei ZHANG Zhang ZHANG Yichuan WANG Meiying YE Wei FANG Limin TONG State Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering Zhejiang University Hangzhou 310027 China College of Material Chemistry and Chemical Engineering Hangzhou Normal University Hangzhou 310036 China

We demonstrate a novel optofluidic refractive index （RI） sensor with high sensitivity and wide dynamic range based on partial reflection. Benefited from the divergent incident light and the output fibers with different tilting angles, we have achieved highly sensitive RI sensing in a wide range from 1.33 to 1.37. To investigate the effectiveness of this sensor, we perform a measurement of RI with a resolution of ca. 5.0× 10^-5 refractive index unit （RIU） for ethylene glycol solutions. Also, we have measured a series of liquid solutions by using different output fibers, achieving a resolution of ca. 0.52mg/mL for cane surge. The optofluidic RI sensor takes advantage of the high sensitivity, wide dynamic range, small footprint, and low sample consumption, as well as the efficient fluidic sample delivery, making it useful for applications in the food industry.

关键词： Optofluidic sensor refractive index partial reflection

Sensitivity Analysis of a Bioinspired refractive index Based Gas Sensor

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Journal of Bionic Engineering 2011年第3期8卷 323-334页

作者： Yang Gao Qi Xia Guanglan Liao Tielin Shi Wuhan National Laboratory for Optoelectronic Wuhan 430074 P. R. Chinao State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074 P. R. China

It was found out that the change of refractive index of ambient gas can lead to obvious change of the color of Morpho butterfly＇s wing. Such phenomenon has been employed as a sensing principle for detecting gas. In the present study, Rigorous Coupled-Wave Analysis （RCWA） was described briefly, and the partial derivative of optical reflection efficiency with respect to the refractive index of ambient gas, i.e., sensitivity of the sensor, was derived based on RCWA. A bioinspired grating model was constructed by mimicking the nanostructure on the ground scale of Morpho didius butterfly＇s wing. The analytical sensitivity was verified and the effect of the grating shape on the reflection spectra and its sensitivity were discussed. The results show that by tuning shape parameters of the grating, we can obtain desired reflection spectra and sensitivity, which can be applied to the design of the bioinspired refractive index based gas sensor.

关键词： bioinspired gas sensor sensitivity diffraction gratings refractive index subwavelength structures

Highly sensitive fiber refractive index sensor based on side-core holey structure

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Chinese Physics B 2014年第10期23卷 225-229页

作者：韩雅夏历刘德明 Next Generation Internet Access National Engineering Laboratory (NGIA) School of Optical and Electronic InformationHuazhong University of Science and Technology (HUST)

We propose a side-core holey fiber （SCHF）-based surface plasmon resonance （SPR） sensor to achieve high refractive index （RI） sensitivity. The SCHF structure can facilitate analyte filling and enhance the overlapping area of the core mode and surface plasmon polariton （SPP） mode. The coupling properties of the sensor are analyzed by numerical simulation. The maximum sensitivity of 5000 nm/RIU in an RI range of 1.33-1.44, and the average sensitivity of 9295 nm/RIU in an RI range from 1.44 to 1.54 can be obtained.

关键词： holy fiber surface plasmon resonance refractive index fiber sensor