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Vertical-Polarized Tri-Band Monopolar Antenna With Controllable and Stackable Notched Frequencies

IEEE Antennas and Wireless Propagation Letters 2025年第6期24卷 1437-1441页

作者： Li, You Peng, Jian-Dong Ye, Liang Hua Guangdong University of Technology School of Physics and Optoelectronic Engineering Guangzhou510006 China Guangdong University of Technology Guangdong Provincial Key Laboratory of Sensing Physics and System Integration Applications Guangzhou510006 China

A new scheme of stacking tri-notched frequencies is introduced to develop a tri-band omnidirectional antenna with vertical polarization. In this scheme, a ground plane and a three-sector M-shaped sheet with a top-loaded patch are excited by a 50 Ω coaxial cable, aiming to achieve excellent impedance and vertical-polarized omnidirectional radiation performance within a broad bandwidth. Subsequently, a three-sector fan-shaped patch with three metal holes, three I-shaped slots and three 1.0λ resonant rings are successively introduced to create two stopbands at 2.75 GHz to 3.25 GHz and 4.25 GHz to 4.37 GHz, thereby dividing the ultra-broad band into three desired bands. In our design, the notched bands can be controlled by altering the sizes of the fan-shaped patch, metal hole, I-shaped slot, and resonant ring. The test results indicate that the proposed antenna has three operating bands at 1.44 GHz to 2.76 GHz, 3.19 GHz to 4.36 GHz, and 4.50 GHz to 4.70 GHz. The tri-band antenna also has good omnidirectivity and a low profile of 0.049λm (λm stands for the maximum wavelength in the operating band), indicating its suitability for indoor communication in the bands of FDD/DCS/PCS/UMTS, LTE, and 5G NR n77/partial n79. © 2002-2011 IEEE.

关键词： Omnidirectional antennas

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Algorithm for de-scattering 3D images from infrared time-of-flight(ToF) cameras

Algorithm for de-scattering 3D images from infrared time-of-...

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2023 Advanced Fiber Laser Conference, AFL 2023

作者： Lu, Taoran Qiu, Su Wang, Hui Key Laboratory of Optoelectronic Imaging Technology and System of the Ministry of Education Beijing Institute of Technolog Beijing100081 China

ISBN: (纸本)9781510677661

An algorithm for mitigating the interference of scattering media in Time of Flight (ToF) cameras during imaging is proposed. This algorithm addresses the issues of decreased image quality, reduced contrast, and loss of depth information. The method is based on atmospheric background light prior knowledge and outlier handling. Firstly, a threshold segmentation is applied to the depth histogram of the image to eliminate the interference of backscattered light. Secondly, an image restoration algorithm based on the atmospheric background light prior is used to remove interference from the image. Finally, outliers in the restored image are removed to obtain the final processed image. Experimental results show that the proposed algorithm improves the peak signal-To-noise ratio, structural similarity, image information entropy, and the number of matched feature points by an average of 9.21 dB, 10.02%, 0.83, and 12, respectively, compared to the original algorithm. This validates the effectiveness and superiority of the proposed algorithm. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Cameras

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Reconstruction of high-resolution depth profiling from single-photon data based on PCA 7

Reconstruction of high-resolution depth profiling from singl...

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Real-time Photonic Measurements, Data Management, and Processing VII 2023

作者： Wang, Hui Qiu, Su Lu, Taoran MOE Key Laboratory of Optoelectronic Imaging Technology and System Beijing Institute of Technology Beijing China

ISBN: (纸本)9781510667938

The high sensitivity and picosecond temporal resolution of single-photon avalanche diode (SPAD) make it the preferred single-photon detector in extreme imaging environments. Extreme imaging environments (e.g., underwater high-scattering environments) usually result in low signal-to-noise ratios of the acquired single-photon data, which leads to poor quality of image reconstruction, so it is necessary to propose a high-resolution single-photon three-dimensional reconstruction algorithm for extreme imaging environments. Principal component analysis (PCA) is widely used and robust, which is suitable for dimensionality reduction and noise reduction processing of single-photon data with sparse and noisy characteristics. Under the premise that the target data has a strong correlation with the background and random noise, the target feature extraction of the single-photon data is carried out by PCA, the principal components are used to reconstruct the original data, the relative position and size of the original data are effectively retained, the redundant information is removed, and the single-photon data is reconstructed using cross-correlation and ManiPoP algorithms to achieve high-resolution single-photon depth profile reconstruction. © 2023 SPIE.

关键词： Principal component analysis

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AWG-based large dynamic range fiber Bragg grating interrogation system

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optoelectronics Letters 2024年第3期20卷 129-134页

作者： LI Shufeng YUAN Pei LI Ke LI Ting ZHU Lianqing Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science&Technology UniversityBeijing 100192China Beijing Laboratory of Optical Fiber Sensing and System Beijing Information Science&Technology UniversityBeijing 100016China

Arrayed waveguide gratings(AWGs) are extensively employed in fiber Bragg grating(FBG) interrogation systems due to their compact size, lightweight nature, and excellent interrogation performance. The resolution and total measurement range of AWG-based FBG interrogation systems are constrained by the output properties of AWG. We proposed an AWG-based large dynamic range interrogation system. The temperature dependence of AWG is exploited to achieve continuous interrogation. The test results show that the interrogation system has a dynamic range of 28.67 nm, an interrogation accuracy better than 25 pm, and a wavelength resolution of 6 pm.

关键词： fiber waveguide AWG

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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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Orthogonal Translation Computed Laminography Aliasing Artifacts Elimination via Adaptive L0 Gradient Minimization

Orthogonal Translation Computed Laminography Aliasing Artifa...

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2024 Academic Conference of China Instrument and Control Society, ACCIS 2024

作者： Tan, Chuandong Zhong, Guowei Lin, Xinxin Li, Qi Zou, Hao Duan, Liming Engineering Research Center of Industrial Computed Tomography Nondestructive Testing Key Laboratory of Optoelectronic Technology and System Chongqing China

ISBN: (纸本)9798350350326

Orthogonal translation computed laminography (OTCL) focuses on non-destructive testing of plate-like objects in the thickness direction, which can obtain higher geometric magnification than computed tomography (CT). However, the structure of OTCL scanning mode will lead to incomplete projection data, resulting in aliasing artifacts in the reconstructed images. To suppress aliasing artifacts, this paper proposed an adaptive gradient L0 minimization aliasing artifacts suppression method for computed laminography filtered backprojection (CLFBP) algorithm reconstructed images, named CLFBP-LO. Firstly, the CLFBP algorithm is used to reconstruct images from OTCL projection data. Secondly, the gradient L0 minimization parameter is adaptively set via the clarity of the image, thereby eliminating aliasing artifacts. The experimental results show that the proposed CLFBP-LO method can effectively eliminate aliasing artifacts and avoid images over smooth. © 2024 IEEE.

关键词： Computerized tomography

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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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Splitter engineering through optimizing topological adiababtic passage

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Frontiers of physics 2025年第1期20卷 145-163页

作者： Jia-Ning Zhang Jin-Lei Wu Cheng Lv Jiabao Yao Jie Song Yong-Yuan Jiang School of Physics Harbin Institute of TechnologyHarbin 150001China School of Physics Zhengzhou UniversityZhengzhou 450001China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Key Laboratory of Micro-Nano Optoelectronic Information System Ministry of Industry and Information TechnologyHarbin 150001China Key Laboratory of Micro-Optics and Photonic Technology of Heilongjiang Province Harbin Institute of TechnologyHarbin 150001China

Topologically protected states are important in realizing robust optical behaviors that are quite insensitive to local defects or perturbations,which provide a promising solution for robust photonic ***,we propose to implement fast topological beam splitters and routers via the adiabatic passage of edge and interface states in the cross-linking configuration of Su-Schrieffer-Heeger(SSH)chains with interface *** channel state does not immerse into the band continuum during the adiabatic cycle,making the adiabatic restriction less stringent and the transport process more *** on the accelerated topological pumping,the beam splitters and routers exhibit improved robustness against losses of the system yet degraded resilience to fluctuation of coupling strengths and on-site energies compared with the conventional topological splitting and routing *** addition,we confirm that the model demonstrates good scalability when the system size is *** simulation results of topological beam splitting in coupled waveguide arrays are in good consistency with theoretical *** topological design provides a robust way to control photons,which may suggest further application of topological devices with unique properties and functionalities for integrated photonics.

关键词： topological effects in photonic systems Su-Schrieffer-Heeger topological photonics waveguides

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Automatic Segmentation of Diabetic Macular Edemas and ILM-RPE Layers in Retinal OCT Images Based on MFANet 23

Automatic Segmentation of Diabetic Macular Edemas and ILM-RP...

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9th International Conference on Computing and Artificial Intelligence, ICCAI 2023

作者： Liu, Shuang Wu, Jun Xiao, Zhitao Geng, Lei Zhang, Fang School of Electronics and Information Engineering Tianjin Key Laboratory of Optoelectronic Detection Technology and System TianGong University Tianjin300387 China School of Life Sciences Tianjin Key Laboratory of Optoelectronic Detection Technology and System TianGong University Tianjin300387 China

ISBN: (纸本)9781450399029

Aiming at the problems of blurred boundary and low segmentation accuracy of existing retinal OCT image segmentation methods, this paper designs a MFANet semantic segmentation model based on encode-decoder for the purpose of accurate segmentation of diabetic macular edemas and ILM-RPE layers, and proposes an automatic retinal OCT image segmentation method based on this model. This method takes the DeepLabV3+ network as the main body and improves the dilated convolution part, which can fully extract the multiscale features of the lesions and obtain a large enough receptive field to effectively balance the local and global information of the retina;the decoder increases the attention feature integration module, reduces information reduction and enlarges the global dimension interaction feature. The introduced global attention effectively strengthens the model’s learning of important features of retinal image. The experimental results show that the proposed method has better segmentation effect than the existing methods, and the MIoU reaches 85.82%. It can extract the macular edema regions quickly and accurately, identify the boundary information better, and provide a quantitative analysis tool for clinical diagnosis and treatment. © 2023 Copyright held by the owner/author(s).

关键词： Semantic Segmentation

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Investigation of Short-Circuit Failure Mechanism in 1.2kV SiC MOSFET 2

Investigation of Short-Circuit Failure Mechanism in 1.2kV Si...

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2nd IEEE International Power Electronics and Application Symposium, PEAS 2023

作者： Luo, Houcai Wu, Huan Zhang, Jingping Zheng, Bofeng Chen, Xianping Chongqing University Key Laboratory of Optoelectronic Technology and Systems Chongqing400044 China System Security and New Technology Chongqing University Key Laboratory of Optoelectronic Technology and Systems Education Ministry of China State Key Laboratory of Power Transmission Equipment Chongqing400044 China

ISBN: (纸本)9798350313765

The reliability and failure mechanism of SiC MOSFET under short-circuit was investigated using experiment and physical simulation in this paper. A short-circuit test platform was constructed, and a physical simulated model was calibrated. A commercial 1.2kV SiC MOSFET operated under different voltages including 200V, 400V, 600V with series short-circuit time was studied. The results showed that the thermal dissipation played a critical role during short-circuit operation, which is one of the most impacting factor to gate voltage and current tails. Two failed mechanisms including gate oxide degradation and parasitic BJT conduction failure were verified during short-circuit. This study may be helpful to the application engineering of SiC MOSFET. © 2023 IEEE.

关键词： experiment and physical simulation failure mechanism short-circuit SiC MOSFET

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