Laser & Optoelectronics Progress, Volume. 62, Issue 15, 1531002(2025)

Infrared Light Response Characteristics of Artificial Nanoporous Structured High-Temperature Superconducting Thin Films

Yuchen Zhao1, Jiayuan Zhou1, Weiying Hu2, Xiaoli Xi1、*, and Haizhi Song2、**
Author Affiliations
  • 1College of Automation and Information Engineering, Xi'an University of Technology, Xi'an 710048, Shaanxi , China
  • 2Southwest Institute of Technical Physics, Chengdu 610041, Sichuan , China
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    Superconducting thin-film infrared detectors exhibit characteristics such as high sensitivity, wide response band, high response speed, low noise, and low power consumption, making them a remarkable application of superconducting materials. Artificial nanoporous structured high-temperature superconducting thin films not only feature critical temperatures above the liquid nitrogen temperature range but also possess superconducting-insulation phase transition characteristics with potential applications in infrared detection. This study focuses on two types of copper-based high-temperature superconducting materials, namely thallium barium calcium copper oxide (Tl-2212) and yttrium barium copper oxide (YBCO), to investigate the infrared light response characteristics of artificial nanoporous structured high-temperature superconducting thin films. First, a time-domain finite-difference simulation model of high-temperature superconducting nanoporous thin films is established. By comparing the light response characteristics of uniform and porous thin films, an equivalent medium model-based approach for light response modeling is determined. Next, the equivalent error of three equivalent models of the light absorption rate under different thin-film thicknesses is evaluated. The results show that the Maxwell-Garnett model provides high accuracy in approximating the optical properties of artificial nanoporous high-temperature superconducting thin films. Finally, using the particle swarm optimization algorithm, the light absorption rate of back-illuminated artificial nanoporous high-temperature superconducting thin films loaded with optical cavities is optimized for a single wavelength of 1550 nm in the near-infrared range and the broadband range of 3?5 μm in the mid-infrared. The strong agreement with the full-wave simulation results confirms that the Maxwell-Garnett equivalent model ensures high design accuracy while simplifying the design process. Additionally, for a 30 nm thick film, the light absorption rate of the nanoporous structured Tl-2212 thin film at 1550 nm reaches 97.13%, while the nanoporous structured YBCO thin film achieves at least 80% light absorption rate in the range of 3000?3797 nm. These results provide a valuable reference for the design of superconducting infrared detectors.

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    Yuchen Zhao, Jiayuan Zhou, Weiying Hu, Xiaoli Xi, Haizhi Song. Infrared Light Response Characteristics of Artificial Nanoporous Structured High-Temperature Superconducting Thin Films[J]. Laser & Optoelectronics Progress, 2025, 62(15): 1531002

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    Paper Information

    Category: Thin Films

    Received: Dec. 26, 2024

    Accepted: Feb. 7, 2025

    Published Online: Aug. 4, 2025

    The Author Email: Xiaoli Xi (xixiaoli@xaut.edu.cn), Haizhi Song (hzsong1296@163.com)

    DOI:10.3788/LOP242499

    CSTR:32186.14.LOP242499

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