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学者姓名：徐圣瑶
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Abstract ：
Objective Chiral-effect-based metasurfaces provide a new solution for the design of circular polarized light (CPL) detectors due to their high design flexibility and compact structure. However, the design of polarization-sensitive chiral metasurfaces still faces challenges in high bandwidth, high circular dichroism (CD), and high extinction ratios. To further enhance the extinction ratio performance of infrared circular polarization detectors and achieve higher CD and extinction ratios over a wide bandwidth, we propose a silicon-based two-dimensional chiral metasurface for circular polarization detection, thereby promoting the practical application of circular polarization detection. Methods We design and propose a high-performance, broadband all-dielectric two-dimensional chiral metasurface for circular polarization detection, thus achieving high bandwidth, high CD, and high transmittance. Firstly, a chiral meta-atom with a high degree of freedom is introduced, composed of a lateral rectangle and two pairs of center-symmetric trapezoids, one large and one small (trapezoid (1) and trapezoid (2)). Subsequently, based on the finite-difference time-domain method, an optimization objective function targeting high CD is established. Meanwhile, a chaotic particle swarm optimization algorithm is employed to conduct a global search in high-dimensional space, ultimately leading to a high-performance chiral metasurface for circular polarization detection. Results and Discussions The designed infrared broadband chiral metasurface enables efficient transmission of left-handed circularly polarized (LCP) incident light, achieving maximum transmittance of 95 %. After passing through the chiral metasurface, the polarization state of LCP light is converted to right-handed circularly polarized (RCP) light, with extinction effects on RCP incident light shown (Figs. 2 and 3). When LCP light is incident, the device demonstrates high transmittance characteristics due to strong coupling effects and localized field enhancement between the LCP light and the metasurface structure, whereas it exhibits high reflectance characteristics under RCP incidence (Fig. 4). By adjusting the geometric parameters of the device, both the operating bandwidth and CD can be tuned (Fig. 5). Given the current levels of micro-nano fabrication technology, we further analyze the influence of the sharp tip structure of the meta-atom on the device's CD. The results indicate that rounding the tip reduces the extinction ratio at 1.65 mu m, with minimal influence on the device's CD within the operating bandwidth, thus demonstrating sound manufacturability (Fig. 6). Conclusions We design a silicon-based all-dielectric chiral metasurface for circular polarization detection, thereby achieving extinction ratio performance superior to that of other reported two-dimensional chiral metasurface devices for circular polarization detection. Additionally, it can function as a half-wave plate for LCP light while blocking the transmission of RCP light within the continuous wavelength range of 1416-1742 nm. The maximum circular dichroism reaches 0.94, the maximum extinction ratio (ER) is 42 dB, and the transmittance is 95 %, with excellent polarization characteristics shown at 1.65 mu m. The designed all-dielectric two-dimensional chiral metasurface possesses features such as high bandwidth, high transmittance, high CD, and easy manufacturing. It can be fabricated by adopting semiconductor manufacturing techniques compatible with standard CMOS technology, thereby presenting significant application potential in near-infrared polarization detection and on-chip polarization imaging systems.
Keyword ：
circular dichroism circular dichroism circular polarization circular polarization extinction ratio extinction ratio metasurface metasurface polarization detection polarization detection
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| GB/T 7714 | Chang, Weijie , Lin, Xiaohui , Li, Jinping et al. Design of Infrared Broadband All-Dielectric Chiral Metasurface for Circular Polarization Detection [J]. | ACTA OPTICA SINICA , 2024 , 44 (23) . |
| MLA | Chang, Weijie et al. "Design of Infrared Broadband All-Dielectric Chiral Metasurface for Circular Polarization Detection" . | ACTA OPTICA SINICA 44 . 23 (2024) . |
| APA | Chang, Weijie , Lin, Xiaohui , Li, Jinping , Huang, Feng , Xu, Shengyao . Design of Infrared Broadband All-Dielectric Chiral Metasurface for Circular Polarization Detection . | ACTA OPTICA SINICA , 2024 , 44 (23) . |
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Abstract ：
RGBD cameras that capture color and depth information have a wide range of applications such as robotics, autonomous driving, and cons umer electronics. Traditional RGBD imaging usually requires multi-cameras or extra active illumination which inevitably leads to bulky or complex imaging systems, hindering the growing demand for compact integrated optical devices. Optical metasurface have emerged as a powerful substitute to the traditional diffractive optical element due to the superior dispersion manipulation and extremely compact size. However, it is still a great challenge to realize a single-shot monocular metasurface camera, due to the strong and unignorable wavelength-dependent aberrations. In this work, we demonstrate an end-to-end compact single-shot monocular metasurface camera for RGBD imaging. By utilizing end-to-end joint optimization framework to learn metasurface physical structure in conjunction with deep neural networks reconstruction algorithm, the multidimensional light field information RGBD of a scene in a single shot can be reconstructed within a depth range of 0.5 m. Compared with traditional lens-based RGBD imaging, our proposed metasurface-based imaging achieves an improvement of about 2 dB in chromatic imaging and a 4 times increase in depth estimation accuracy. Our proposed scheme could facilitate the further development of the intelligent computational meta-optics in diverse fields ranging from machine vision to biomedical imaging.
Keyword ：
Computational imaging Computational imaging End -to end joint optimization End -to end joint optimization Metasurface Metasurface RGBD imaging RGBD imaging
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| GB/T 7714 | Xu, Shengyao , Chi, Chuirong , Zheng, Shuang et al. End-to-end optimization of single-shot monocular metasurface camera for RGBD imaging [J]. | OPTICS COMMUNICATIONS , 2024 , 566 . |
| MLA | Xu, Shengyao et al. "End-to-end optimization of single-shot monocular metasurface camera for RGBD imaging" . | OPTICS COMMUNICATIONS 566 (2024) . |
| APA | Xu, Shengyao , Chi, Chuirong , Zheng, Shuang , Chang, Weijie , Huang, Feng . End-to-end optimization of single-shot monocular metasurface camera for RGBD imaging . | OPTICS COMMUNICATIONS , 2024 , 566 . |
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An interval-sweeping pulse equivalent sampling (ISPES) method based on compressed sensing technique is proposed to enhance the frequency response of phase-sensitive optical time-domain reflectometry (phi-OTDR). The proposed method achieves an equivalent high-sampling-rate acquisition of Rayleigh backscattered signals along each sensing point of the fiber by the interval-sweeping pulse sampling and compressed sensing reconstruction. Meanwhile, based on the Whittaker-Shannon interpolation formula, the observation matrix corresponding to the interval-sweeping pulse sampling is successfully constructed and proved, which is easy to implement in hardware. In experiments, an ultrasonic signal with a frequency up to 28 kHz at the end of a 4.4-km sensing fiber is accurately identified by using this method, which outperforms other compressed-sensing-based methods. And multi-frequency vibration signals are also accurately detected. Besides, this method performs signal compression while sampling. The number of samples is only 13.3% of the reconstructed data, significantly reducing the amount of data acquisition/transmission/storage. Therefore, the proposed method can effectively enhance the frequency response of phi-OTDR to sparse-wideband vibration signals without any hardware modification. It also has great advantages in reducing the hardware burden and improving the response speed.
Keyword ：
Compressed sensing Compressed sensing fiber optics sensors fiber optics sensors frequency response frequency response non-uniform sampling non-uniform sampling phase-sensitive optical time-domain reflectometry phase-sensitive optical time-domain reflectometry
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| GB/T 7714 | Xiao, Zhenyu , Yuan, Xueguang , Zhang, Yang'an et al. Frequency Response Enhancement of f-OTDR Using Interval-Sweeping Pulse Equivalent Sampling Based on Compressed Sensing [J]. | JOURNAL OF LIGHTWAVE TECHNOLOGY , 2023 , 41 (2) : 768-776 . |
| MLA | Xiao, Zhenyu et al. "Frequency Response Enhancement of f-OTDR Using Interval-Sweeping Pulse Equivalent Sampling Based on Compressed Sensing" . | JOURNAL OF LIGHTWAVE TECHNOLOGY 41 . 2 (2023) : 768-776 . |
| APA | Xiao, Zhenyu , Yuan, Xueguang , Zhang, Yang'an , Xu, Shengyao , Li, Zhengyang , Huang, Yongqing . Frequency Response Enhancement of f-OTDR Using Interval-Sweeping Pulse Equivalent Sampling Based on Compressed Sensing . | JOURNAL OF LIGHTWAVE TECHNOLOGY , 2023 , 41 (2) , 768-776 . |
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Optical fiber sensors working at the dispersion turning point (DTP) have served as promising candidates for various sensing applications due to their ultrahigh sensitivity. In this review, recently developed ultrasensitive fiber sensors at the DTP, including fiber couplers, fiber gratings, and interferometers, are comprehensively analyzed. These three schemes are outlined in terms of operation principles, device structures, and sensing applications. We focus on sensitivity enhancement and optical transducers, we evaluate each sensing scheme based on the DTP principle, and we discuss relevant challenges, aiming to provide some clues for future research.
Keyword ：
dispersion turning point dispersion turning point fiber coupler fiber coupler fiber grating fiber grating interferometer interferometer optical fiber sensor optical fiber sensor sensitivity enhancement sensitivity enhancement
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| GB/T 7714 | Xu, Shengyao , Kang, Peng , Hu, Zhijie et al. Ultrasensitive Optical Fiber Sensors Working at Dispersion Turning Point: Review [J]. | SENSORS , 2023 , 23 (3) . |
| MLA | Xu, Shengyao et al. "Ultrasensitive Optical Fiber Sensors Working at Dispersion Turning Point: Review" . | SENSORS 23 . 3 (2023) . |
| APA | Xu, Shengyao , Kang, Peng , Hu, Zhijie , Chang, Weijie , Huang, Feng . Ultrasensitive Optical Fiber Sensors Working at Dispersion Turning Point: Review . | SENSORS , 2023 , 23 (3) . |
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Abstract ：
We propose and demonstrate a method to enhance the fabrication tolerance of ultrasensitive microfiber sensors operating around dispersion turning point, in which two stressing parts are introducing into the fiber cladding forming two-stressing-applying fiber. In this way, the strict requirements for microfiber diameters can be significantly eased, allowing fabrication reproducibility and large-scale preparation.
Keyword ：
dispersion turning point dispersion turning point fabrication tolerance fabrication tolerance two-stressing-applying fiber two-stressing-applying fiber ultrasensitive microfiber ultrasensitive microfiber
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| GB/T 7714 | Xu, Shengyao , Chi, Chuirong , Chang, Weijie et al. Ultrasensitive Two-stressing-applying Microfiber-Based Sensor Operating Near the Dispersion Turning Point with Enhanced Fabrication-tolerance [J]. | 2022 IEEE 14TH INTERNATIONAL CONFERENCE ON ADVANCED INFOCOMM TECHNOLOGY (ICAIT 2022) , 2022 : 184-187 . |
| MLA | Xu, Shengyao et al. "Ultrasensitive Two-stressing-applying Microfiber-Based Sensor Operating Near the Dispersion Turning Point with Enhanced Fabrication-tolerance" . | 2022 IEEE 14TH INTERNATIONAL CONFERENCE ON ADVANCED INFOCOMM TECHNOLOGY (ICAIT 2022) (2022) : 184-187 . |
| APA | Xu, Shengyao , Chi, Chuirong , Chang, Weijie , Huang, Feng . Ultrasensitive Two-stressing-applying Microfiber-Based Sensor Operating Near the Dispersion Turning Point with Enhanced Fabrication-tolerance . | 2022 IEEE 14TH INTERNATIONAL CONFERENCE ON ADVANCED INFOCOMM TECHNOLOGY (ICAIT 2022) , 2022 , 184-187 . |
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