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Terahertz polarization modulator based on chiral metasurface integrated with vanadium dioxide

Optics Letters 2025年第10期50卷 3345-3348页

作者： Luo, Li Zhou, Ling Zou, Yuxin Yang, Jiaqi Huo, Jiahui Yang, Xu Lv, Yuanyuan Bian, Jingjing Peng, Sui Liu, Bo Pan, Yudong He, Jin Li, Jie Yao, Jianquan Sichuan Province Key Laboratory of Optoelectronic Sensor Devices and Systems College of Optoelectronic Engineering Chengdu IC Valley Industrial College Chengdu University of Information Technology Chengdu610225 China Sichuan Meteorological Optoelectronic Sensor Technology and Application Engineering Research Center Chengdu University of Information Technology Chengdu610225 China Chengdu Advanced Metal Materials Industry Technology Research Institute Limited Company Chengdu610300 China School of Precision Instruments and Opto-Electronics Engineering Tianjin University Tianjin300072 China

Conventional optical polarization modulation depends on block birefringent devices, and currently there are still no commercial polarization modulation devices available for terahertz beams in free space. Metasurfaces present more opportunities for the manipulation of optical and terahertz waves, which are advantageous for highly efficient polarization modulation devices. In this paper, what we believe to be a new chiral metasurface for the polarization modulation of reflected terahertz waves is proposed that consists of vanadium dioxide (VO2) combined with metal patterns for active chiral meta-atoms. Through electric stimulation, dynamic modulation of the polarization state can be achieved. The results indicate that the metasurface shows a strong circular dichroism at an operating frequency of 0.192 THz. In the insulating state, the absorption of the right-circularly polarized (RCP) wave is significantly higher than that of the left-circularly polarized (LCP) wave. By adjusting the transition state of VO2, the chirality of the structure is reduced, enabling the reflected wave to be switched from a circularly polarized state to a linearly polarized one. The absorption and polarization of terahertz wave can also be controlled by the incident angle. This method is anticipated to promote the development of terahertz communication and imaging technologies. © 2025 Optica Publishing Group. All rights are reserved.

关键词： Circular polarization

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Reliability Enhancement Experimental Study for Mems Gas sensors 38

Reliability Enhancement Experimental Study for Mems Gas Sens...

引用

38th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2025

作者： Huo, Chaoyang Wu, Jingxin Zhu, Minjie Xia, Yuanlin Wang, Zhuqing Instrumentation Technology and Economy Institute Sensor and Network Control Center Beijing100055 China Sichuan University School of Mechanical Engineering Chengdu China Sichuan University Med+X Center for Manufacturing West China Hospital Chengdu China

ISBN: (纸本)9798331508890

This study proposes a novel method based on Reliability Enhancement Testing (RET) to induce potential defects in MEMS gas sensors. An experimental profile was designed based on RET theory, and failure stimulation was performed on MEMS gas sensors with multi-layer structures. The results show that this method has an extremely good defect activation effect on MEMS gas sensors. Further fault localization and failure analysis indicated that fatigue cracks in the gas-sensitive film were the primary cause of MEMS gas sensor failures, with these cracks being significantly related to residual stresses within the film and differences in thermal expansion coefficients of different layer materials. This research is expected to provide new technical pathways for reliability optimization of similar MEMS gas sensors during the development phase. © 2025 IEEE.

关键词： Microchannels

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Characterization of Photonic Temperature sensors by Comparative Human Body Measurements Using Waveguide Bragg Grating and Microring Resonator-Based sensors

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IEEE sensors Journal 2025年第9期25卷 15005-15012页

作者： Li, Xiaolin Li, Hongqiang Xie, Fanglin Han, Ming Zhang, Lizhen Zhang, Shanshan Li, Enbang Tiangong University Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems School of Electronics and Information Engineering Tianjin300387 China Tiangong University Shaoxing Keqiao Institute Zhejiang Shaoxing312030 China Tiangong University Engineering Teaching Practice Training Center Tianjin300387 China Nankai University Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern Optics Tianjin300071 China University of Wollongong Centre for Medical Radiation Physics School of Physics Faculty of Engineering and Information Sciences WollongongNSW2522 Australia

Human body temperature is an important indicator of physical health. Waveguide Bragg grating (WBG)- and microring resonator (MRR)-based polymer optical waveguide temperature sensors provide alternative methods for monitoring the human body temperature. In this study, optical waveguide temperature sensors, with a combination of polymethylmethacrylate (PMMA) and polydimethylsiloxane (PDMS) for the formation of waveguide structures, are designed and fabricated via a polymer-based fabrication process to achieve real-time temperature measurements in situ. We experimentally characterized and compared the sensor thermal properties within the temperature range of 35 °C–40 °C. Based on the results from our study, the WBG and MRR temperature sensors had high-sensitivity properties. The temperature sensitivity coefficient of the WBG temperature sensor was −177.6 pm/°C and that of the MRR temperature sensor was −0.03035 mW/°C. The error of these two temperature sensors did not exceed 0.1 °C. These sensors show great promise as basic sensing elements in optical waveguide sensor applications for the early detection and monitoring of heat-related illnesses. © 2001-2012 IEEE.

关键词： Optical waveguides

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Outage Performance Analysis for RIS-Enabling Full-Duplex Cellular Symbiotic Radio network

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IEEE Transactions on Vehicular technology 2025年

作者： Liang, Zhanqian Han, Shiying Liang, Ying-Chang Nankai University Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology College of Electronic Information and Optical Engineering Tianjin300350 China University of Electronic Science and Technology of China Center for Intelligent Networking and Communications Chengdu611731 China

Aiming at breaking through the transmission distance limitation faced by symbiotic radio, in this correspondence, reconfigurable intelligent surface (RIS) is introduced to enable symbiotic transmission within cellular range. To avoid high-cost channel estimation, the phase shifting of the RIS is designed only based on the channel state information of the cascaded backscatter channel which is easy to obtain. Outage probabilities of the backscatter device (BD) and the ambient transmission, both in parasitic and commensal modes, are derived based on Lyapunov's theorem and Hermite-Gauss quadrature. Simulation results illustrate that the BD outage performance is highly sensitive to the number of RIS reflection elements (N) both in parasitic and commensal modes. When N is sufficiently large, its further increment has little impact on the outage probability of the ambient system, although the phase shift is designed merely to enhance the BD transmission. It also offers a guideline in coordinating N with the ambient transmit power to balance between the outage performance of the ambient system and that of the backscatter system. © 1967-2012 IEEE.

关键词： Cellular radio systems

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Spin-dependent terahertz wavefront shaping based on hybrid phase in all-silicon chiral metasurfaces

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Photonics Research 2025年第5期13卷 1271-1281页

作者： Li, Jie Chen, Leling Xu, Hang Nan, Tong Lu, Xueguang Li, Hui Xu, Wenhui Tan, Qi Li, Jitao Lv, Yuanyuan Liu, Tingting Xiao, Shuyuan Tang, Tingting Luo, Li Huang, Wanxia He, Jin Zhang, Yan Yao, Jianquan Sichuan Meteorological Optoelectronic Sensor Technology and Application Engineering Research Center College of Optoelectronic Engineering Chengdu University of Information Technology Chengdu610225 China School of Precision Instruments and Opto-Electronics Engineering Tianjin University Tianjin300072 China Key Laboratory of Terahertz Optoelectronics Ministry of Education Department of Physics Capital Normal University Beijing100048 China College of Materials Science and Engineering Sichuan University Chengdu610065 China School of Information Engineering Nanchang University Nanchang330031 China

Independent manipulation of orthogonal circularly polarized wavefronts is one of the important goals for meta-optics, and chiral nanophotonics is one of the crucial approaches. In this article, we propose a new scheme for spin-dependent terahertz wavefront shaping based on chiral metasurfaces, which involves a hybrid design of the propagation phase, chirality induced phase, and Pancharatnam-Berry phase in all-silicon meta-atoms. A controllable linear polarization conversion effect in the transmitted wave is obtained via breaking the mirror symmetry and preserving the C2 symmetry of the resonator, which causes a different form of the Jones matrix. By simultaneously adjusting the in-plane geometric dimensions and azimuth angle of chiral units, and utilizing the evolution characteristics of circularly polarized components in parameter space and polarization space, spin-dependent phase responses have been observed. We provide the main theoretical analysis and demonstrate the functional design of circularly polarized multiplexed beam deflection or vortex beam generation, through the expected simulation and experimental results near the operating frequency of 0.6 THz. Our results may enrich the design of terahertz polarization-multiplexed devices. © 2025 Chinese Laser Press.

关键词： Wavefronts

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Reliability Enhancement Experimental Study for Mems Gas sensors

Reliability Enhancement Experimental Study for Mems Gas Sens...

引用

IEEE International Conference on Micro Electro Mechanical Systems

作者： Chaoyang Huo Jingxin Wu Minjie Zhu Yuanlin Xia Zhuqing Wang School of Mechanical Engineering Sichuan University Chengdu China Sensor and Network Control Center Instrumentation Technology and Economy Institute Beijing China Med+X Center for Manufacturing West China Hospital Sichuan University Chengdu China

ISBN: (数字)9798331508890

ISBN: (纸本)9798331508906

关键词： Micromechanical devices Temperature sensors Vibrations Data acquisition Reliability engineering Reliability Gas detectors Optimization Thermal stresses Thermal stability

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A Non-Amplification, Low Detection Limit in Situ Detection Strategy for Mir-451 Based on Dark-Field Scattering Spectral Analysis

SSRN

引用

SSRN 2025年

作者： Zi, Xingyu Cheng, Hongen Wang, Jianqi Liu, Kuilin Liu, Guohua College of Electronic Information and Optical Engineering Nankai University Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin300350 China Engineering Research Center of Thin Film Optoelectronics Technology Ministry of Education Nankai University Tianjin300350 China

Effective non-invasive early screening methods for colorectal cancer are crucial for reducing mortality rates in patients with colorectal cancer. Since microRNA(miRNA) dysregulation has been confirmed to be closely associated with colorectal cancer, high-sensitivity and accurate quantitative miRNA detection methods are regarded as effective tools for early diagnosis. In this study, we report a non-amplification-based in Situ miRNA detection strategy using localized surface plasmon resonance (LSPR) technology, where gold nanoparticles (AuNPs) immobilized on a microfluidic chip act as biosensors and ssDNA probes are employed for specific detection. Using dark-field microscopy to analyze the spectra of individual AuNPs, we achieved detection of miR-451 with a detection limit of 56 fM. This strategy amplifies the detection signal through in situ detection, avoiding the need for sample amplification. We suggest that this detection strategy can be effectively applied to miRNA detection and absolute quantification in fecal or blood samples, potentially offering a promising alternative to current miRNA detection methods. © 2025, The Authors. All rights reserved.

关键词： Surface plasmon resonance

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Improved finite-size analysis for measurement-device-independent quantum digital signature

arXiv

引用

arXiv 2025年

作者： Zhu, Jia-Li Zhang, Chun-Hui Wang, Yue-Ying Wang, Qin Institute of quantum information and technology Nanjing University of Posts and Telecommunications Nanjing210003 China "Broadband Wireless Communication and Sensor Network Technology" Key Lab of Ministry of Education NUPT Nanjing210003 China "Telecommunication and Networks" National Engineering Research Center NUPT Nanjing210003 China

Quantum digital signatures (QDS), based on the principles of quantum mechanics, provide information-theoretic security, ensuring the integrity, authenticity, and non-repudiation of data transmission. With present QDS protocols, measurement-device-independent QDS (MDI-QDS) can resist all attacks on detections, yet it suffers from finite-size effect. In this work, we present and compare three parameter estimation models for finite-size analysis of two-decoy MDI-QDS. The first model is a commonly used model in previous schemes, and we propose two new models to improve the performance. Subsequently, we perform numerical simulations to evaluate the performance of the three models. The results demonstrate that the proposed methods are less affected by finite-size effect, thereby effectively enhancing the signature rate. This work contributes to the practical development of QDS. Copyright © 2025, The Authors. All rights reserved.

关键词： Authentication

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Hybrid Implementation for Untrusted-node-based Quantum Key Distribution network

arXiv

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arXiv 2025年

作者： Liu, Jingyang Zhou, Xingyu Ding, Huajian Xu, Jiaxin Zhang, Chunhui Li, Jian Wang, Qin Institute of quantum information and technology Nanjing University of Posts and Telecommunications Nanjing210003 China "Broadband Wireless Communication and Sensor Network Technology"Key Lab of Ministry of Education Ministry of Education Nanjing210003 China "Telecommunication and Networks"National Engineering Research Center NUPT Nanjing210003 China

Quantum key distribution (QKD) serves as a cornerstone of secure quantum communication, providing unconditional security grounded in quantum mechanics. While trusted-node networks have facilitated early QKD deployment, their vulnerability to node compromise underscores the need for untrusted-node architectures. Measurement-device-independent QKD (MDI-QKD) and twin-field QKD (TF-QKD) have emerged as leading candidates, addressing security vulnerabilities and extending transmission distances. Despite the wide adoptions in various fiber scaling, no integrated implementation of these two protocols has been demonstrated to date. Here, we present a hybrid system that seamlessly integrates TF-QKD and MDI-QKD into one untrusted-node-based architecture. Utilizing an efficient phase estimation method based on asymmetric interferometers, we convert twin-field global phase tracking to relative phase calibration, allowing near continuous running of both protocols. Experiments demonstrate secure finite-size key rates for sending-or-not-sending QKD and MDI-QKD over fiber distances of 150 to 431 km. The results align with theoretical simulations and show the ability to surpass the absolute repeaterless key capacity. Our work offers an unified framework for deploying multi-protocol QKD networks, laying the foundation for adaptable and scalable quantum infrastructures that can meet a wide range of security and performance needs. Copyright © 2025, The Authors. All rights reserved.

关键词： Quantum communication

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Twisted bilayer meta-device for on-demand terahertz polarization filtering

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Photonics Research 2025年第5期13卷 1116-1129页

作者： Li, Hui Zhao, Chenhui Xu, Wenhui Li, Jie Zheng, Chenglong Tan, Qi Song, Chunyu Xu, Hang Shen, Yun Yao, Jianquan Ministry of Education School of Precision Instruments and Opto-Electronics Engineering Tianjin University Tianjin300072 China Department of Physics School of Physics and Materials Science Nanchang University Nanchang330031 China Sichuan Meteorological Optoelectronic Sensor Technology and Application Engineering Research Center Chengdu University of Information Technology Chengdu610225 China Key Laboratory of Material Physics Ministry of Education School of Physics and Microelectronics Zhengzhou University Zhengzhou450052 China Ministry of Education Southwest Jiaotong University Chengdu610097 China

Moiré meta-devices facilitate continuous and precise modulation of optical properties through the alteration of the relative alignment, such as twisting, sliding, or rotating of the metasurfaces. This capability renders them particularly suitable for dynamic applications, including zoom optics and adaptive imaging systems. Nevertheless, such designs often sacrifice more complex functionalities, such as polarization manipulation, in favor of simplicity and tunability. Here, we propose and experimentally validate a design strategy for a twisted bilayer metasurface that exhibits both varifocal capabilities and polarization filtering properties. By selecting silicon pillars with polarization-maintaining properties for Layer I and polarization-converting properties for Layer II, the designed Moiré metasurface can become sensitive to specific polarization states. Experimental results demonstrate that the proposed design can generate on-demand terahertz (THz) focused beams, achieving an average focusing efficiency exceeding 35% under x-linearly polarized (x-LP) illumination. This is accomplished by systematically varying the twisting angles p and q of Layer I in relation to Layer II in increments of 30°. Additionally, we provide numerical evidence that the focal length of the transmitted vortex beam can be adjusted using the same approach. The Moiré meta-device platform, which is engineered to modulate optical properties via mechanical twisting, obviates the necessity for external power sources or active materials. This generalized design strategy has the potential to significantly expedite the commercialization of multifunctional metasurfaces, which can produce high-precision optics across various practical applications. © 2025 Chinese Laser Press.

关键词： Adaptive optics

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