Dr. Jian Shen Profile

Dr. Jian Shen

at Hainan Univ

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Proceedings Article | 18 November 2024 Paper

Guided-mode resonant grating filter based on Sb2Se3 with dual-band tuning

Jian Shen, Junsheng Chen, Chaoyang Li

Proceedings Volume 13398, 133980A (2024) https://doi.org/10.1117/12.3050279

KEYWORDS: Tunable filters, Reflectivity, Diffraction gratings, Antimony, Optical filters, Crystals, Selenium, Waveguides, Optical gratings, Refractive index

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Tunable optical filters show excellent performance in integrated optics. Present schemes for tunable filter either have a large footprint or suffer from mediocre performance, hindering the development of integrated optics systems. Here, a tunable guided-mode resonant grating filter is elaborately designed through a precise, modified coupling mode theory. This structure consists of a silver metallic grating and a multilayer waveguide. The grating period of the grating layer is arranged in a gradient descent configuration. The diffraction effects produced by the grating structure, when coupled with the guided modes in the underlying multilayer waveguide, result in guided-mode resonance, thereby achieving band-pass filtering. We employ Sb2Se3, a phase-change material, as the dielectric layer in the multilayer waveguide structure. By controlling the temperature, Sb2Se3 can transition between amorphous and crystalline states, enabling switching between two operational bands. Simulation results demonstrate that the transition between the amorphous and crystalline states of Sb2Se3 allows for switching of the filtering range from 1262.5-1269.5 nm to 1544-1552 nm. We analyzed the electric field energy distribution and the quality factor (Q) of the resonance peaks to verify and understand the device's performance. Our design offers a novel approach to achieving tunable filtering in the near-infrared band, with potential applications in signal processing, wireless communication, and the medical field.

Proceedings Article | 18 March 2021 Paper

Fast and convenient PH detection methods with long period fiber probe of polyaniline coating

Xiao Wang, Xiaowan Guo, Mengfan Ge, Zhucheng Li, Yubo Zhao, Jian Shen, Chaoyang Li

Proceedings Volume 11780, 117801X (2021) https://doi.org/10.1117/12.2590810

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A kind of fiber PH sensor coated with PANI (polyaniline) on the surface of LPFG (long-period fiber grating) has been developed in the work. PANI film was nurtured in the solution by in-situ chemical oxidative polymerization and the growth process of the PH sensitive film was traced by an optical spectrum analyzer to optimize the response of the sensor. The RI and optical properties of PANI change regularly in the PH range of 2-12, which is the basic principle of LPFG coated with PANI sensing material for PH measurement. Though the experiment, the sensor can achieve a high sensitivity of 152pm/ph. Besides, other performances of the sensor, such as response time, temperature stability, reversibility and long-term stability were studied in the experiment. As a result, The PANI-LPFG sensor has such advantages as fast response speed, excellent temperature stability, low cost, easy to be used, and continuous measurement of the environment.

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