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This work introduces a terahertz (THz) chiral biosensing platform leveraging bound states in the continuum (BIC) metasurfaces implemented with dual asymmetric split-ring resonators (ASRRs). By strategically breaking in-plane and out-of-plane symmetries, the metasurface achieves tunable quasi-BIC resonances with tailored Q-factors and giant circular dichroism (CD) responses (max CD ≈ 0.612). Full wave simulations demonstrate chiral discrimination of D/L-glutamic acid enantiomers via 83 GHz resonance shifts and 0.05 transmission contrast under circularly polarized illumination. The proposed metasurface biosensor holds potential to advance terahertz circular polarization communication and biosensing applications.

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Circularly Polarized Bound States in the Continuum Driven Terahertz Metasurface for Chiral Substance Identification

  • 会议论文

  • 发表日期：

    2026年

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  • Xilai Zhao,
  • Dingyan Chen,
  • Jing Lou

摘要

This work introduces a terahertz (THz) chiral biosensing platform leveraging bound states in the continuum (BIC) metasurfaces implemented with dual asymmetric split-ring resonators (ASRRs). By strategically breaking in-plane and out-of-plane symmetries, the metasurface achieves tunable quasi-BIC resonances with tailored Q-factors and giant circular dichroism (CD) responses (max CD ≈ 0.612). Full wave simulations demonstrate chiral discrimination of D/L-glutamic acid enantiomers via 83 GHz resonance shifts and 0.05 transmission contrast under circularly polarized illumination. The proposed metasurface biosensor holds potential to advance terahertz circular polarization communication and biosensing applications.