Carbon Dioxide Gas Sensor Based on Terahertz Metasurface with Asymmetric Cross-Shaped Holes Empowered by Quasi-Bound States in the Continuum

• Published in: Sensors (Basel, Switzerland) Vol. 25; no. 13; p. 4178
• Main Authors: He, Kai, Ma, Tian
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 04.07.2025; MDPI
• Subjects: Asymmetry; bound states in the continuum; Carbon dioxide; Copper; Electric fields; gas sensing; Optical properties; planar metasurface; Plasma etching; Sensors; Silver; Simulation; Symmetry; terahertz; bound states in the continuum; gas sensing; planar metasurface; terahertz

In this paper, a novel type of polarization-insensitive terahertz metal metasurface with cross-shaped holes is presented, which is designed based on the theory of bound states in continuous media. The fundamental unit of the metasurface comprises a metal tungsten sheet with a cross-shaped hole struc...