A New Design of a Terahertz Metamaterial Absorber for Gas Sensing Applications

Metamaterial absorbers are used in the terahertz frequency regime as photo-detectors, sensing elements, imaging applications, etc. Narrowband absorbers, on account of their ultra-slender bandwidth within spectrum, show a significant shift absorption peak when an extrinsic entity relative to absorber, like refractive index or temperature encircling medium, is altered. This property paves path for narrowband be potential sensors detect any alterations medium. In this paper, novel design metamaterial (MTM) absorber proposed, which can sense variations (RI) surrounding The effective permeability structure negative, while its permittivity positive; thus, it ?-negative metamaterial. layout involves swastika-shaped made gold top dielectric gallium arsenide (GaAs) substrate. proposed achieved nearly perfect 99.65% at 2.905 (THz), resulting quality factor (Q-factor) 145.25. has sensitivity 2.12 THz/RIU over range varied from n = 1.00 1.05 with step size 0.005, thereby achieving Figure Merit (FoM) 106. Furthermore, sensor was found have polarization-insensitive characteristic. Considering high (S), further tested gas applications harmful gases. As case study, chloroform. work foundation developing highly sensitive sensors.