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Single-beam optical trap-based surfaceenhanced raman scattering optofluidic molecular fingerprint spectroscopy detection system

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Opto-Electronic Advances 2025年第2期8卷 16-27页

作者： Ning Sun Yuan Gan Yujie Wu Xing Wang Shen Shen Yong Zhu Jie Zhang The Key Laboratory of Optoelectronic Technology&System Education Ministry of ChinaChongqing UniversityChongqing 400044China.

In this study,we developed a single-beam optical trap-based surface-enhanced Raman scattering(SERS)optofluidic molecular fingerprint spectroscopy detection *** system utilizes a single-beam optical trap to concentrate free silver nanoparticles(AgNPs)within an optofluidic chip,significantly enhancing SERS *** investigated the optical field distribution characteristics within the tapered fiber using COMSOL simulation software and established a MATLAB simulation model to validate the single-beam optical trap's effectiveness in capturing AgNPs,demonstrating the theoretical feasibility of our *** verify the particle capture efficacy of the system,we experimentally controlled the optical trap's on-off state to manage the capture and release of particles *** experimental results indicated that the Raman signal intensity in the capture state was significantly higher than in the non-capture state,confirming that the single-beam optical trap effectively enhances the SERS detection capability of the optofluidic detection ***,we employed Raman mapping techniques to investigate the impact of the capture area on the SERS effect,revealing that the spectral intensity of molecular fingerprints in the laser-trapping region is significantly *** successfully detected the Raman spectrum of crystal violet at a concentration of 10^(−9)mol/L and pesticide thiram at a concentration of 10^(−5)mol/L,further demonstrating the ability of the single-beam optical trap in enhancing the molecular fingerprint spectrum identification capability of the SERS optofluidic *** optical trapping SERS optofluidic detection system developed in this study,as a key component of an integrated optoelectronic sensing system,holds the potential for integration with portable high-power lasers and high-performance Raman *** integration is expected to advance highly integrated technologies and significantly enhance the overall performance

关键词： surface-enhanced Raman scattering optofluidic single-beam optical trap tapered optical fibers

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Fiber Fabry-Perot Demodulation system Based on Dual Fizeau Interferometers

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Photonic Sensors 2023年第2期13卷 56-68页

作者： Deyi KONG Zengyu SONG Ning WANG Zhiqi WANG Peijian HUANG Yong ZHU Jie ZHANG The key Laboratory of Optoelectronic Technology&System(Ministry of Education) Chongqing UniversityChongqing 400044China

In this study,we present a dual-Fizeau-interferometer-based high-speed and wide-range fiber-optic Fabry-Perot(F-P)demodulation *** employ two Fizeau interferometers with air cavity thickness satisfying the quadrature requirement to increase the demodulation speed and broaden the demodulation range in order to address the issues of the existing fiber F-P demodulation system's sluggish demodulation rate and limited *** order to investigate the demodulation properties of the dual-Fizeau-interferometer-based demodulation system,we derive and create a theoretical model of the *** theoretical model,which primarily consists of the structural design of the interferometer and the study of the center wavelength of the light sources and their bandwidth selection,is used to construct the optical structure of the demodulation *** to the calculation results,the demodulated signal exhibits the best contrast ratio when the two light sources'respective center wavelengths are 780nm and 850nm,and their bandwidths are 28nm and 30 ***,we finish evaluating the demodulation system's demodulation performance,parameter calibration,and assembly *** test results demonstrate the constant operation of the demodulation system,an update rate of 100kHz,a demodulation range of 4.74μm,and a cavity length resolution of approximately 5 ***,the system can perform high speed demodulation thanks to the light emitting diode's(LED's)nanosecond level switching speed and the usage of a single point detector.

关键词： Fiber-optic Fabry-Perot sensor Fizeau interferometer LED optical path difference quadrature requirement

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SERS activity of carbon nanotubes modified by silver nanoparticles with different particle sizes

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Chinese Physics B 2022年第7期31卷 529-538页

作者： Xiao-Lei Zhang Jie Zhang Yuan Luo Jia Ran Chongqing Municipal Level Key Laboratory of Photoelectronic Information Sensing and Transmitting Technology College of Optoelectronic EngineeringChongqing University of Posts and TelecommunicationsChongqing 400065China Postdoctoral Research Center of Chongqing Key Laboratory of Optoelectronic Information Sensing and Transmission Technology Chongqing University of Posts and TelecommunicationsChongqing 400065China Key Laboratory of Optoelectronic Technology&System Ministry of EducationCollege of Optoelectronic EngineeringChongqing UniversityChongqing 400044China

A two-dimensional(2D)surface-enhanced Raman scattering(SERS)substrate is fabricated by decorating carbon nanotube(CNT)films with Ag nanoparticles(Ag NPs)in different sizes,via simple and low-cost chemical reduction method and self-assembling *** change of Raman and SERS activity of carbon nanotubes/Ag nanoparticles(CNTs/Ag NPs)composites with varying size of Ag NPs are investigated by using rhodamine 6G(R6G)as a probe ***,the scattering cross section of Ag NPs and the distribution of electric field of CNTs/Ag NPs composite are simulated through finite difference time domain(FDTD)*** plasmon resonance(SPR)wavelength is redshifted as the size of Ag NPs increases,and the intensity of SERS and electric field increase with Ag NPs size *** experiment and simulation results show a Raman scattering enhancement factor(EF)of 108for the hybrid substrate.

关键词： Raman spectroscopy surface-enhanced Raman scattering(SERS) carbon nanotubes silver nanoparticles

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Infrared image super-resolution reconstruction based on residual fast fourier transform

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Multimedia Tools and Applications 2025年第9期84卷 6805-6823页

作者： Li, Xianguo Liu, Rui Yang, Yanli School of Electronics and Information Engineering Tiangong University Tianjin China Tianjin Key Laboratory of Optoelectronic Detection Technology and System Tianjin China

Infrared images have been widely used in military, civilian, and industrial fields. Due to the inherent limitations of sensors, infrared images usually have some disadvantages such as low resolution and blurred texture details. How to improve the resolution of infrared images without changing hardware devices has become a current research hotspot. Aiming at the problem that the existing infrared image super-resolution reconstruction methods do not utilize the image details sufficiently, this paper proposes an infrared image super-resolution reconstruction algorithm based on residual fast fourier transform(ISRRFT). The image features are extracted in both spatial domain and frequency domain, so as to fully extract the high-frequency and low-frequency information components of infrared images and improve the quality of reconstructed infrared images In addition, the learnable fast fourier transform loss function has been introduced, which is used in conjunction with the L1 loss function to calculate the loss from both the spatial and frequency domains, thus better optimizing the model parameters. The test results on three test sets, SR1280, IRData and Infrared20, show that the proposed algorithm has an optimal performance in terms of both objective and subjective evaluation metrics compared to current representative algorithms. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

关键词： Image reconstruction

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Design of an Underwater Micro-Scanning Single-Photon Laser Imaging system Based on SPAD Array 10

Design of an Underwater Micro-Scanning Single-Photon Laser I...

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10th Symposium on Novel optoelectronic Detection technology and Applications

作者： Kuang, Yanjin Zhao, Huanqing Tian, Youyuan Wu, Guanlin Qiu, Su Jin, Weiqi Zhu, Shihao Yu, Xiangzhi MOE Key Laboratory of Optoelectronic Imaging Technology and System Beijing Institute of Technology Beijing China

ISBN: (数字)9781510688155

ISBN: (纸本)9781510688148

There is an urgent need for new concept underwater observation and detection equipment in marine exploration, becoming a key development direction for marine resource detection, marine scientific research, underwater rescue, and underwater defense. With the advancement of new SPAD array technology, its application in terrestrial/underwater Lidar has gained attention. This paper addresses the issues of insufficient photoelectric imaging sensitivity and high noise under strong underwater scattering conditions by investigating an underwater micro-scanning laser single-photon imaging system based on a 32×32 avalanche photodiode (SPAD) array. The system uses a SPAD array with time-correlated single-photon counting (TCSPC) functionality combined with a high-power, high-repetition-rate blue-green laser and micro-scanning imaging methods to detect weak photon echo signals underwater. It employs 2×2 low-resolution micro-scanning imaging to achieve 64×64 micro-scanning high-resolution single-photon imaging and recognition for both terrestrial and underwater targets. Additionally, the design of the optical system, optomechanical structure, and underwater pressure-sealed tank is carried out. An underwater micro-scanning single-photon laser imaging experimental system based on the SPAD array is developed. Through imaging experiments on land and underwater, the feasibility and effectiveness of the system's technical approach are demonstrated, providing effective technical and methodological support for further detection systems in actual marine environments. © 2025 SPIE.

关键词： Avalanche photodiodes

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Thickness Measurement of Single-Mode Fiber Coating Layer Based on Forward Brillouin Scattering

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IEEE Sensors Journal 2025年第11期25卷 19332-19340页

作者： Zhang, Yongqi Wang, Tao Liu, Yijia Liu, Li Zhang, Mingjiang Taiyuan University of Technology Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education College of Physics and Optoelectronic Engineering Taiyuan030024 China Taiyuan University of Technology Shanxi Key Laboratory of Precision Measurement Physics The College of Physics and Optoelectronic Engineering Taiyuan030024 China

The coating layer is essential for protecting and applying optical fibers. Nowadays, the thickness measurement of the coating layer relies on point measurement schemes, such as the side-looking light distribution method and mechanical method. However, there are some problems with the above methods, such as the tradeoff between resolution and field of view (FOV), the cutting of the measurement position, and the long measurement time. To overcome these problems, we propose a new method based on forward Brillouin scattering (FBS), which measures the coating layer thickness of single mode fibers (SMFs). The physical properties of the transverse acoustic field involved in FBS make it possible to measure the thickness of the fiber coating. The corresponding relationship between the transverse acoustic mode frequency and the diameter of the coating layer can be calculated. The coating layer thickness can be measured with high precision by measuring the frequency spectrum of FBS corresponding to multiple transverse acoustic modes at a given temperature. In the verification experiment, three types of SMF coated with polyimide are used as the sensing fiber to measure the thickness of the coating layer at multiple temperatures. The experimental results show that the error in the coating layer thickness obtained is less than 0.05 μm. To the best of our knowledge, this is the first demonstration of nondestructive, high-precision monitoring of fiber coating thickness. © 2025 IEEE.

关键词： Acoustic field measurement

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Design of Wireless Video Transmission system Based on Retina-like Distributed CMOS Imager 10

Design of Wireless Video Transmission System Based on Retina...

引用

10th Symposium on Novel optoelectronic Detection technology and Applications

作者： Li, Pengcheng Cao, Fengmei MOE Key Laboratory of Optoelectronic Imaging Technology and System Beijing Institute of Technology Beijing100081 China

ISBN: (数字)9781510688155

ISBN: (纸本)9781510688148

This paper proposes the design of a wireless video transmission system based on the retina-like distributed CMOS imaging device, BIT-Retina52, aimed at addressing the issue of cable entanglement caused by wired transmission during dynamic image rotation-elimination experiments. The overall design takes the heterogeneous multi-core chip ZYNQ SoC as the main control unit to conduct co-design of hardware and software: the Programmable Logic (PL) side implements the acquisition, format conversion, and transmission of image data, while the Processing system (PS) manages data flow control, data buffering, and packetized transmission. Additionally, a Linux system was built to port the USB Wi-Fi module driver. The upper computer system was developed using the Qt framework for image reception and display. Through timing simulations and experimental validation, this design successfully achieved the stable acquisition and transmission of visible light images from the BIT-Retina52 under wireless conditions. © 2025 SPIE.

关键词： CMOS integrated circuits

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Unrolling Reweighted Total Variation-Based Split Bregman Iterative Framework for Electrical Impedance Tomography Image Reconstruction

IEEE Transactions on Computational Imaging

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IEEE Transactions on Computational Imaging 2025年 11卷 748-763页

作者： Wang, Zichen Zhang, Tao Wang, Qi Tiangong University School of Electronic and Information Engineering Tianjin300387 China Tiangong University Tianjin Key Laboratory of Optoelectronic Detection Technology and System Tianjin300387 China

Electrical impedance tomography (EIT) is one of the typical ill-posed inverse problems, where serious ill-posedness and the linear approximation of the forward operator lead to obvious distortions and artifacts in the degraded reconstructions, further limiting its practical application. The learning-based strategies with image enhancement have been introduced into EIT reconstruction and also achieved improvements. Nevertheless, this idea ignores the priori knowledge of physical information, while not fully exploiting data consistency, resulting in poor generalization and interpretability. In this work, a reweighted Split Bregman (SB) iterative algorithm is proposed regularized by total variation firstly, referred to as RwTVSB. Moreover, the RwTVSB iteration is unrolled into a neural network-based learning framework, dubbed as RwTVSB-Net. The reweighted matrix is introduced to the SB iteration, which could overcome the loss of information of the forward operator due to the linear approximation and also enhance the constraints of the physical priori. Specifically, (1) a network based on residual connection and SE-attention is designed to update the reweighted matrix. (2) Further, a U-shaped architecture with deformable large kernel convolution, dilated convolution, and cross-attention is embedded into this unrolling framework to learn the soft threshold operator. This not only maintains consistency with the RwTVSB iterative algorithm but also uses multi-scale features to fusion information at multiple levels. Both simulated and real-world measured data are employed to validate the effectiveness and advantages of the proposed RwTVSB-Net. The visual reconstructions and quantitative metrics show that RwTVSB-Net outperforms other state-of-the-art methods. In addition, the robustness of the method is tested and validated on multiple imaging tasks. © 2015 IEEE.

关键词： Electric impedance tomography

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Spectral-interferometry-based diff-iteration for high-precision micro-dispersion measurement

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Photonics Research 2024年第6期12卷 1362-1370页

作者： WEI DU JINGSHENG HUANG YANG WANG MAOZHONG ZHAO JUAN LI JUNTAO HE JINDONG WANG WENFU ZHANG TAO ZHU Key Laboratory of Optoelectronic Technology&System(Ministry of Education) Chongqing UniversityChongqing 400044China State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China

Precise measurement of micro-dispersion for optical devices(optical fiber,lenses,etc.)holds paramount significance across domains such as optical fiber communication and dispersion interference ***,due to its complex system,complicated process,and low reliability,the traditional dispersion measurement methods(interference,phase shift,or time delay methods)are not suitable for the accurate measurement of micro-dispersion in a wide spectral ***,we propose a spectral-interferometry-based diff-iteration(SiDi)method for achieving accurate wide-band micro-dispersion *** an optical frequency comb,based on the phase demodulation of the dispersion interference spectrum,we employ the carefully designed SiDi method to solve the dispersion curve at any position and any *** approach is proficient in precisely measuring micro-dispersion across a broadband spectrum,without the need for cumbersome wavelength scanning processes or reliance on complex high-repetition-rate combs,while enabling adjustable *** efficacy of the proposed method is validated through simulations and *** employed a chip-scaled soliton microcomb(SMC)to compute the dispersion curves of a 14 m single-mode fiber(SMF)and a 0.05 m *** to a laser interferometer or the theoretical value given by manufacturers,the average relative error of refractive index measurement for single-mode fiber(SMF)reaches 2.8×10^(-6) and for glass reaches 3.8×10^(-6).The approach ensures high precision,while maintaining a simple system structure,with realizing adjustable resolution,thereby propelling the practical implementation of precise measurement and control-dispersion.

关键词： interferometer dispersion iteration

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A Novel Shape Restoration Algorithm for Ultra-Fast Morphology Perception 8

A Novel Shape Restoration Algorithm for Ultra-Fast Morpholog...

引用

8th optoelectronics Global Conference, OGC 2023

作者： Li, Juan Wang, Jindong Zhu, Tao Chongqing University Key Laboratory of Optoelectronic Technology & System Chongqing China

ISBN: (纸本)9798350325324

In this paper, we present a novel surface reconstruction algorithm leveraging curvatures and lengths between discrete points. By integrating this algorithm with a shape sensing system, we achieve high-speed measurement of wing shapes. The simulation and experimental results clearly demonstrate the effectiveness of our proposed algorithm in restoring preset curves. The average relative error is found to be at a remarkable level of 10-2, while the average running time remains at an impressive level of 10-2 s. Additionally, through static and dynamic shape perception performed by the shape sensing system, we observe a relative error of 4.85% when subjecting the simulated wing to uniform tension, and a relative error of 3.1% under twisted tension conditions. These findings confirm the capability of our experimental device to accomplish rapid morphological monitoring at an impressive frequency of 505 kHz. © 2023 IEEE.

关键词： Morphology

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