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A Comprehensive Evaluation Method for Sensing Characteristics of Multi-Peak Terahertz Metamaterials Sensor in Polarization Mode

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Photonic Sensors 2023年第4期13卷 12-26页

作者： Yuee WANG Dongxia LI Huiwen LUO Zhi LI Fangrong HU Huo ZHANG Lingyao YU Guangxi Key Laboratory of Automatic Detecting Technology and Instruments Guilin University of Electronic TechnologyGuilin 541004China Guilin University of Aerospace Technology Guilin 541004China Guangxi Key Laboratory of Optoelectronic Information Processing School of Optoelectronic EngineeringGuilin University of Electronic TechnologyGuilin 541004China

In this study,the multi-peak terahertz metamaterials sensors are designed and fabricated,whose structures are the asymmetrical single split ring(SSR)and three split rings(TSR).The resonant formation and sensing mechanism of the two structures are investigated by using the finite-difference time-domain(FDTD)*** B6(VB6)and its reactants with bovine serum protein(BSA)are tested as the medium,and the sensing experiments of the SSR and TSR are carried *** experimental and simulation results indicate the consistent law,which is the sensitivity of the resonance in the transverse magnetic(TM)mode is much greater than that in the transverse electric(TE)*** to the weighted average method and the law for unequal precision measuring,the quality factor of the resonance is used as the weighting coefficient to calculate the comprehensive evaluation parameter(CEP)of the multi-peak metamaterials sensors in the TE and TM modes based on the experimental *** the CEP and frequency shifts are as the evaluation parameter in experiments,the law’s variation of the CEP is consistent with that of the frequency shift,indicating that it is feasible to characterize the sensing characteristics of metamaterials with the CEP,which presents simplified characteristics of multi-peak metamaterials at different polarization *** method implies that the different influencing factors may be integrated into the CEP with the idea of weight,which promotes the practical application of the metamaterials *** revelation of the sensing law also provides a method for the design of the terahertz metamaterials sensor with the high sensitivity.

关键词： Terahertz MMs sensor multi-resonance mode polarization mode weighted frequency shift

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Enhanced picosecond terahertz wave generation based on cascade effects in a terahertz parametric generator

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Chinese Physics B 2024年第8期33卷 271-275页

作者：张敬喜王与烨徐炳烽陈锴刘紫鲲马鸿儒徐德刚姚建铨 School of Precision Instruments and Optoelectronics Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Optoelectronic Information Technology(Ministry of Education) Tianjin UniversityTianjin 300072China

Enhanced terahertz wave generation via a Stokes cascade process has been demonstrated using picosecond pulse pumped terahertz parametric generation at 1 kHz repetition *** cascade saturation of terahertz output was observed,and the corresponding cascade-Stokes spectra were *** maximum terahertz wave average power was 22μW under a pump power of 30 W,whereas the maximum power conversion efficiency was 8×10^(-7)under a pump power of 21 *** THz power fluctuation was measured to be about 1%in 20 *** THz parametric source with a relatively stable output is suitable for a variety of practical applications.

关键词： terahertz parametric generation stimulated polariton cascade effect CLN crystal

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Mechanically reconfigurable terahertz polarization converter by coupling-mediated metasurfaces

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Chinese Optics Letters 2024年第12期22卷 113-119页

作者： Zhibo Yao Zhaohua Xu Xiaoyuan Hao Jiajun He Yanfeng Zhao Xiangyu Liu Yanfeng Li Xueqian Zhang Quan Xu Su Xu Jiaguang Han Center for Terahertz Waves and State Key Laboratory of Precision Measurement Technology and Instruments College of Precision Instrument and Optoelectronics EngineeringTianjin UniversityTianjin 300072China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Guangxi Key Laboratory of Optoelectronic Information Processing School of Optoelectronic EngineeringGuilin University of Electronic TechnologyGuilin 541004China

Free manipulation of electromagnetic waves in the terahertz(THz)band based on metasurface functional devices has been the focus of research in recent *** these devices,active metasurfaces have generated extensive research interest due to their *** this work,we demonstrate a mechanically reconfigurable THz polarization converter that consists of two parallel transmissive metasurfaces with a tunable *** mechanically adjusting the coupling strength between the metasurfaces,the orthogonal polarization conversion of the incident linearly polarized THz waves can be ***,the device can be tuned from efficient dual-frequency orthogonal polarization conversion to efficient single-frequency orthogonal polarization *** a gradual decrease in efficiency,it is finally changed to a low transmission state as the gap distance increases from 150 to 800μ*** theoretically analyze the tuning process under different spacings and experimentally verify it using a vector network *** proposed design is straightforward and robust,with the potential to find wide applications in THz science and technology.

关键词： mechanically reconfigurable THz metasurface polarization converter tunable spacing vector network analyzer

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Defect-insensitive cylindrical surface lattice resonance array and its batch replication for enhanced immunoassay

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Microsystems & Nanoengineering 2024年第6期10卷 151-160页

作者： Bin Zhou Chao Hu Haoyang Li Xiangyi Ye Baohua Wen Zhangkai Zhou Jingxuan Cai Jianhua Zhou Key Laboratory of Sensing Technology and Biomedical Instruments of Guangdong Province School of Biomedical EngineeringShenzhen Campus of Sun Yat-sen University518107 ShenzhenChina School of Physics State Key Laboratory of Optoelectronic Materials and TechnologiesSun Yat-sen University510275 GuangzhouChina

Surface lattice resonances(SLR)have been demonstrated to enhance the sensitivity and reduce the full width at half maximum(FWHM)of the plasmonic ***,their widespread application in immunoassays has been hindered by limitations of high structural defect sensitivity and fabrication ***,we design a novel three-layer cylindrical SLR array that exhibits high tolerance against structural defects,which would facilitate straightforward *** integrating metal evaporation and nanoimprint lithography,we demonstrate the replication of the SLR array with exceptional *** simulations indicate that the resonance dips of these arrays exhibit are not sensitive to various structural *** experimental results reveal that the FWHM of these arrays can be as low as 5.1 nm while maintaining robust resonance ***,we demonstrated the high spectral sensitivity of the SLR array,which enabled the detection of immunoglobulin G(IgG)at concentrations as low as 609 pg/*** findings emphasize the potential of the defect-insensitive SLR array as a highly scalable immunoassay platform with exceptional performance.

关键词： cylindrical insensitive resonance

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Research on Photometric Traceability technology of Multi-Parameter Rapid Food Tester

Research on Photometric Traceability Technology of Multi-Par...

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2024 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, 3M-NANO 2024

作者： Li, Tao Han, Qiheng Liu, Zhenchi Fan, Yu Jilin Institute of Metrology Jilin Key Laboratory of Metrological Testing Instruments and Technology Changchun China

ISBN: (纸本)9798350362107

With the increasing prominence of food safety issues, the application of multi-parameter rapid food testers is becoming more and more widespread. The aim of this paper was to address the need for metrological traceability of spectrophotometric multi-parameter rapid food testers for rapid food safety testing applications. In this paper, the photometric linear calibration device for multi-parameter food on-site rapid detector, a standard filter with a transmission ratio measurement range of 5% ∼ 90% and Urel=0.4% ∼ 2.6% (k=2), was developed to address the need for photometric linear calibration of multi-parameter food on-site rapid detector in different nanometer bands. The developed absorbance linear solution standards included: potassium dichromate linear solution standards (0.1 μg/μL, 0.2 μg/μL, 0.4 μg/μL, 0.6 μg/μL), cobalt chloride linear solution standards (10 μg/μL, 20 μg/μL, 30 μg/μL, 40 μg/μL) and copper sulfate linear solution standards (10 μg/μL, 20 μg/μL, 40 μg/μL, 60 μg/μL), which could satisfy the requirements for linear calibration of the spectrophotometric calibration system in the range of 400 nm ∼ 600 nm. The developed fiber optic spectrometer for calibration of multi-parameter on-site rapid food tester proved to be effective in testing the wavelength accuracy of multi-parameter on-site rapid food tester, with the wavelength accuracy of the fiber optic spectrometer reaching ±1.0 nm. This study could effectively solve the demand for photometeric traceability of multi-parameter food rapid detectors, providing new scientific support for the rapid development and technological progress of rapid detection instruments. © 2024 IEEE.

关键词： Spectrophotometers

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Research on an automatic light field refocusing method for a camera array

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Optics Express 2025年第10期33卷 20964-20980页

作者： Pan, Yihua Zhao, Yushan Li, Yuyang Liu, Bin Chen, Ping Shanxi Key Laboratory of Intelligent Detection Technology & Equipment School of Information and Communication Engineering North University of China Shanxi Taiyuan030051 China Key Laboratory of Photoelectronic Imaging Technology System of Ministry of Education of China School of Optics and Photonics Beijing Institute of Technology Beijing100081 China State Key Laboratory of Extreme Environment Optoelectronic Dynamic Testing Technology and Instruments North University of China Shanxi Taiyuan030051 China

Light field information includes the position and angle information of light in space. A camera array is one of the methods for obtaining light field information, which combines and arranges multiple cameras in space to achieve multi-angle imaging of the same target. Based on the light field information, a computational imaging method can be used to achieve refocusing technology for a camera array (also known as optical synthetic aperture imaging technology). In this technology, by setting the focusing coefficient, the light field information can be focused on different depths. This mode is called taking photos first and focusing later. However, in order to focus on a specific object surface, traditional refocusing methods require users to manually adjust the focusing coefficient multiple times, which is time-consuming and user-unfriendly. Therefore, in this paper, we propose an automatic focusing method based on the optimal focusing coefficient map (OFCM) to address the manual refocusing problem. This method transforms the refocusing problem into obtaining the optimal focus coefficient map. In the process of solving OFCM, the threshold filtering method and the neighborhood filling method are used to optimize the results and improve the robustness of the proposed method. The experimental results show that our proposed method has higher imaging quality and faster running efficiency compared to automatic refocusing methods based on disparity maps and gradient functions. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Computational Imaging

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Compact TE-pass polarizer based on lithium-niobate-on-insulator assisted by indium tin oxide and silicon nitride

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Chinese Physics B 2023年第6期32卷 284-289页

作者：刘家敏张德龙 Department of Opto-electronics and Information Engineering School of Precision Instruments and Opto-electronics EngineeringKey Laboratory of Optoelectronic Information Technology(Ministry of Education)and Key Laboratory of Micro-Opto-Electro-Mechanical Systems(MOEMS)Technology(Ministry of Education)Tianjin UniversityTianjin 300072China

An indium tin oxide(ITO) and silicon nitride(Si_(3)N_(4)) assisted compact TE-pass waveguide polarizer based on lithiumniobate-on-insulator is proposed and numerically *** properly designing the ITO and Si_(3)N_(4) assisted structure and utilizing the epsilon-near-zero effect of ITO,the TM mode is strongly confined in the ITO layer with extremely high loss,while the TE mode is hardly affected and passes through the waveguide with low *** simulation results show that the polarizer has an extinction ratio of 22.5 dB and an insertion loss of 0.8 dB at the wavelength of 1.55 μm,and has an operating bandwidth of about 125 nm(from 1540 nm to 1665 nm) for an extinction ratio of>20 dB and an insertion loss of<0.95 ***,the proposed device exhibits large fabrication *** notably,the device is compact,with a length of only 7.5 μm,and is appropriate for on-chip applications.

关键词： polarizer lithium-niobate-on-insulator integrated optics devices optical waveguide

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Measurements of retinal viscoelasticity using acoustic radiation force optical coherence elastography 14

Measurements of retinal viscoelasticity using acoustic radia...

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Optics in Health Care and Biomedical Optics XIV 2024

作者： Ma, Jiawei Meng, Xiaochen Wang, Chongyang Fan, Fan Zhu, Jiang Key Laboratory Ministry of Education for Optoelectronic Measurement Technology and Instruments Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781510682122

The viscoelasticity of the retina can reflect its function and state. Accurate assessment of retinal viscoelasticity can assist in early diagnosis of retinal diseases. With high-resolution and non-contact features, optical coherence elastography (OCE) has been used to evaluate the retinal elasticity based on the elastic wave velocity measurement. Nonetheless, the retinal viscosity cannot be assessed. In this study, a shear wave dispersion OCE method was proposed to measure the retinal viscosity and elasticity. After acoustic radiation force (ARF) induces a shear wave, optical coherence tomography (OCT) visualizes shear wave propagation in the retina. The wave velocities at different frequencies are analyzed, and the viscoelasticity is quantified based on the dispersion analysis. The accuracy of the method was verified on phantoms with different glycerol concentrations. The viscosity of the phantom is related to the concentration of glycerin, and its elasticity is adjusted by the agar concentration. The OCE results closely matched the elasticity measured by a mechanical testing system. Furthermore, the retinal shear wave velocity dispersion on the ex-vivo porcine eye was analyzed to determine its viscoelasticity. Our results demonstrate that ARF-OCE can quantitatively evaluate the viscoelasticity of the retina. The shear wave dispersion OCE method has great potential for diagnosing retinal diseases. © 2024 SPIE.

关键词： Acoustic wave velocity measurement

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Evaluation of scan protocols for optical coherence tomography angiography 14

Evaluation of scan protocols for optical coherence tomograph...

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Optics in Health Care and Biomedical Optics XIV 2024

作者： Zhang, Xuanye Meng, Xiaochen Huang, Junyu Wang, Chongyang Zhu, Jiang Key Laboratory Ministry of Education for Optoelectronic Measurement Technology and Instruments Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781510682122

Optical coherence tomography angiography (OCTA) is a label-free, high-resolution imaging technique used to detect blood flow by combining optical coherence tomography (OCT) with time-series signal analysis. In OCTA, time-series signals from the same position are captured, and fluctuations in the signals are analyzed to detect the blood flow. In this study, we evaluated different OCTA scan protocols in terms of image quality and sampling time, including the dense A-scans, dense B-scans, and multiple B-scans. In the protocols of dense A-scans and dense B-scans, the beam continues scanning with a slight change between adjacent positions. Whereas, the B-scans are repeated at each position along the slow scan direction in the protocol of the multiple B-scans. After capturing the time-series signals using different scan protocols and analyzing them with an OCTA algorithm, we visualized the vasculature of the rat cerebral cortex. The image quality and the sampling time were then analyzed to assess the efficiency of each scan protocol. The quantitative evaluation of these protocols allows for optimizing sampling schemes in OCTA imaging of biological tissues. © 2024 SPIE.

关键词： Angiography

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Simultaneous elastography and angiography using optical coherence tomography 14

Simultaneous elastography and angiography using optical cohe...

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Optics in Health Care and Biomedical Optics XIV 2024

作者： Liang, Yilin Meng, Xiaochen Wang, Chongyang Zhu, Jiang Key Laboratory Ministry of Education for Optoelectronic Measurement Technology and Instruments Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781510682122

Optical coherence tomography (OCT) is a non-invasive, label-free imaging modality that generates high-resolution three-dimensional images. Based on OCT imaging, optical coherence tomography angiography (OCTA) and optical coherence elastography (OCE) can visualize vascular networks and measure the elastic properties of biological tissues. In previous studies, OCTA and OCE were performed separately, providing either vascular network information or elasticity properties of the tissue. We have developed a simultaneous angiography and elastography method using a simplified sample arm structure. After mechanical pressure is loaded on the sample by a glass plate, the deformation is analyzed by the OCT phase changes, and the elasticity is assessed. Meanwhile, the vascular network is visualized by intensity-based Doppler variance analysis. A transparent flexible reference layer is placed between the glass plate and the tissue, which closely contacts the tissue. Better elasticity measurements can be achieved without affecting vascular imaging. The simultaneous elastography and angiography method was demonstrated by the phantom experiments and rat skin measurements. The results show that the information on the microvascular networks and mechanical properties can be obtained at the same imaging location. The method can provide more comprehensive information on biological tissue for disease diagnosis and treatment monitoring. © 2024 SPIE.

关键词： Optical coherence tomography

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