Huygens metasurface supporting quasi-bound states in the continuum for terahertz gas sensing.

ABSTRACT: We investigate a terahertz (THz) gas sensing platform based on all-dielectric metasurfaces that support quasi-bound states in the continuum (quasi-BIC) with both electric and magnetic dipole resonances. The structure is designed to achieve the first Kerker condition, minimizing backscattering and maximizing light-matter interaction, which significantly enhances the sensitivity of the sensor. By optimizing structural parameters, this metasurface selectively resonates at characteristic absorption frequencies of target gases, facilitating detection even at low concentrations. We validate the approach using two gases with strong but distinct THz absorption profiles: hydrogen cyanide and sulfur dioxide ([Formula: see text]). Furthermore, the free-standing design maximizes gas interaction on bot

SUBMITTER: Alvarez-Sanchis JA 

PROVIDER: S-EPMC12032221 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature