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<p>In this paper, we numerically investigate the design of an all-dielectric terahertz metasurface sensor with an ultra-high Q-factor, utilizing the concept of bound states in the continuum (BIC). The proposed metasurface consists of silicon-based cylindrical disks arranged as metamolecules. It is observed that two resonant modes are formed at 3.79 THz and 4.19 THz under symmetric conditions. By introducing a local asymmetry parameter (α) to break the structural symmetry, a leaky channel emerges, converting the ideal BIC into a quasi-BIC (q-BIC). This results in a sharp resonance at 4.06 THz with a Q-factor of 1.5 ×<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:{10}^{4}\)</EquationSource> </InlineEquation>. The numerically evaluated sensing performance demonstrates a high refractive index sensitivity of 1.0746 THz/RIU and a figure of merit (FOM) of 10854.56/RIU over a refractive index range of 1.00-1.15. Tuning the asymmetry further enhances the FOM up to 41330.77/RIU. The proposed metasurface finds strong potential for high-precision sensing, detection, and imaging in the terahertz frequency regime.</p>

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Bound state in the continuum induced high-Q resonances in all-dielectric terahertz metasurface for enhanced refractive index sensing

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Pooja Agarwal,
  • Kamal Kishor,
  • Ravindra Kumar Sinha

摘要

In this paper, we numerically investigate the design of an all-dielectric terahertz metasurface sensor with an ultra-high Q-factor, utilizing the concept of bound states in the continuum (BIC). The proposed metasurface consists of silicon-based cylindrical disks arranged as metamolecules. It is observed that two resonant modes are formed at 3.79 THz and 4.19 THz under symmetric conditions. By introducing a local asymmetry parameter (α) to break the structural symmetry, a leaky channel emerges, converting the ideal BIC into a quasi-BIC (q-BIC). This results in a sharp resonance at 4.06 THz with a Q-factor of 1.5 × \(\:{10}^{4}\) . The numerically evaluated sensing performance demonstrates a high refractive index sensitivity of 1.0746 THz/RIU and a figure of merit (FOM) of 10854.56/RIU over a refractive index range of 1.00-1.15. Tuning the asymmetry further enhances the FOM up to 41330.77/RIU. The proposed metasurface finds strong potential for high-precision sensing, detection, and imaging in the terahertz frequency regime.