Mr. Qingjie Shi Profile

Qingjie Shi

at Shanghai Academy of Spaceflight Technology

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Publications (2)

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Proceedings Article | 30 April 2024 Paper

Mid-infrared dual-band imaging metalens

Xiao Tao, Weiwen Zhou, Dapeng Li, Qingjie Shi, Shuang Cao

Proceedings Volume 13153, 1315315 (2024) https://doi.org/10.1117/12.3018632

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Traditional mid-infrared optical devices are characterized by complex structures, large volumes, and high prices, which impede the advancement of future multidimensional, multifunctional, and miniaturized integration. However, metasurfaces comprising planar and ultra-thin nanostructures have emerged as a promising alternative. By manipulating the interaction between light and materials at subwavelength scales, metasurfaces exhibit remarkable control over optical fields and offer multifunctional capabilities. Consequently, they provide new avenues for integrating infrared systems in a miniaturized form. In this paper, an efficient metalens based on Pancharatnam-Berry (PB) phase working in the mid-infrared range(3.7μm-4.8μm) is proposed and numerically demonstrated. The proposed metalens enables precise control of incident light phase, thereby converge the incident light into two focal spots within spectral-band ranges: 3.7μm-4.0μm (with a focal length of 150μm) and 4.5μm-4.8μm (with a focal length of 250μm). The bifocal metalens is space division multiplexing designed using alternately arranged a-Si nanobricks, facilitating a high polarization conversion efficiency exceeding 80% and achieving achromatic behavior within the two spectral-band ranges. This work demonstrates the potential application of metalens for addressing complex tasks in infrared optical detection.

Proceedings Article | 20 January 2023 Paper

Research on rotary dual channel infrared tracking technology

Tuanjie Xia, Qingjie Shi, Bin Zhou, Huabao Long, Minmin Song, Dongyang Gao, Weiwen Zhou

Proceedings Volume 12555, 1255505 (2023) https://doi.org/10.1117/12.2643105

KEYWORDS: Sensors, Optical tracking, Target detection, Infrared radiation, Control systems, Medium wave, Mirrors, Infrared technology, Infrared search and track, Detection and tracking algorithms

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A rotary dual-channel roll and pitch tracking scheme is proposed, and a dual-channel rotation control algorithm is designed to solve the problem of detector front and phase plane rotation, expand the field of view, and improve detection efficiency. The light and miniaturized platform design in space improves the control speed and accuracy. In the strong maneuvering state of the terminal target, the dual-channel infrared tracking reduces the amount of target misses and improves the performance of the control system to precisely hit the target. In this paper, the research results obtained are expounded from the two aspects of the rotary dual-channel system tracking principle and the rotary dual-channel tracking control method. Firstly, the design of the dual-channel rotation control algorithm is introduced; secondly, the dual-channel rotation tracking loop is designed; finally, the research results are verified by experiments, which illustrate the advantages of the rotation-based tracking in fast response, dual-channel interaction and precise guidance.

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