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<p>This study presents an all-dielectric InSb-based terahertz dual-band absorber with integrated temperature/refractive index sensing. The study proposes a novel configuration combining a square central resonator with a four-armed cross-shaped radiating unit to address the limitations of conventional terahertz absorbers in parameter fixation and dynamic tunability. Full-wave electromagnetic simulations using the finite element method demonstrate room-temperature (300&#xa0;K) absorption peaks of 99.4% at 1.31 THz and 99.2% at 1.502 THz, with corresponding quality factors of 24.72 and 24.62. Further analysis reveals that independent control of dual-peak frequency shifts and absorption efficiency can be achieved through geometric parameters. The device exhibits exceptional polarization insensitivity. The multifunctional nature of the sensor is evidenced by its temperature sensitivities of 9.4&#xa0;GHz/K and 6.8&#xa0;GHz/K, alongside refractive index sensitivities of 1.00 THz/refractive index unit (RIU) and 1.2 THz/RIU. This design provides a tunable platform for terahertz filtering and environmental monitoring applications, while establishing foundations for all-dielectric metamaterial development.</p>

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Temperature and Refractive Index THz Sensor Based on All-Dielectric InSb Metasurfaces

  • 期刊论文

  • 发表日期：

    2025年8月29日

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  • Yansong Liu,
  • Siyuan Zhu,
  • Jiaqi Geng,
  • Yanxu Bao,
  • Yuqiang Zhang,
  • Yaokun Lou,
  • Ping Hu,
  • Xin-Hua Deng

摘要

This study presents an all-dielectric InSb-based terahertz dual-band absorber with integrated temperature/refractive index sensing. The study proposes a novel configuration combining a square central resonator with a four-armed cross-shaped radiating unit to address the limitations of conventional terahertz absorbers in parameter fixation and dynamic tunability. Full-wave electromagnetic simulations using the finite element method demonstrate room-temperature (300 K) absorption peaks of 99.4% at 1.31 THz and 99.2% at 1.502 THz, with corresponding quality factors of 24.72 and 24.62. Further analysis reveals that independent control of dual-peak frequency shifts and absorption efficiency can be achieved through geometric parameters. The device exhibits exceptional polarization insensitivity. The multifunctional nature of the sensor is evidenced by its temperature sensitivities of 9.4 GHz/K and 6.8 GHz/K, alongside refractive index sensitivities of 1.00 THz/refractive index unit (RIU) and 1.2 THz/RIU. This design provides a tunable platform for terahertz filtering and environmental monitoring applications, while establishing foundations for all-dielectric metamaterial development.