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<p>A tunable dual band polarization-sensitive terahertz absorber based on a rectangular cavity covered with monolayer graphene has been proposed and studied in this paper. The calculated results show that the absorber can achieve high-efficiency dual band absorption peaks under both <i>x</i>- and <i>y</i>-polarized incident light. For <i>x</i>-polarized incident light, two distinct absorption peaks with absorption of 94.3% and 91.6% are found at 5.62 and 5.80 THz, respectively. For <i>y</i>-polarized incident light, two absorption peaks are found at 5.32 and 5.75 THz with absorption of 97.6% and 95.8%, respectively. Moreover, the absorber’s closely adjacent and mutually independent dual absorption wavelengths can be tuned by adjusting the graphene’s chemical potential and the absorber’s periods. Owing to the high efficiency and dual band absorption in different polarization states, the absorber has broad application prospects in terahertz polarization imaging and detection.</p>

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Tunable Dual Band Polarization-Sensitive Terahertz Absorber Based on Rectangular Cavity Covered with Monolayer Graphene

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Wenyi Liu,
  • Haixia Zhu,
  • Haibin Ni,
  • Xiaoyan Zhou,
  • Lingsheng Yang,
  • Bo Ni,
  • Jianhua Chang

摘要

A tunable dual band polarization-sensitive terahertz absorber based on a rectangular cavity covered with monolayer graphene has been proposed and studied in this paper. The calculated results show that the absorber can achieve high-efficiency dual band absorption peaks under both x- and y-polarized incident light. For x-polarized incident light, two distinct absorption peaks with absorption of 94.3% and 91.6% are found at 5.62 and 5.80 THz, respectively. For y-polarized incident light, two absorption peaks are found at 5.32 and 5.75 THz with absorption of 97.6% and 95.8%, respectively. Moreover, the absorber’s closely adjacent and mutually independent dual absorption wavelengths can be tuned by adjusting the graphene’s chemical potential and the absorber’s periods. Owing to the high efficiency and dual band absorption in different polarization states, the absorber has broad application prospects in terahertz polarization imaging and detection.