A multi-band absorber based on a dual-trident structure for sensing application

Abstract

Multi-band metamaterial absorbers (MMAs) are widely used in detecting and sensing fields to achieve selective frequency detection. In this study, a triple-narrowband absorber based on a symmetrical dual-trident structure is numerically designed for high absorption and sensing applications in the terahertz region. Simulation results show that the maximum absorptivity of three distinctive narrow-band absorption peaks is up to 99.94% and any of the three resonance frequencies can be utilized for bio-sensing. According to bio-sensing detection, the proposed sensor can simultaneously detect the thickness and refractive index of an unknown layer by utilizing different frequency shifts of the three resonance absorption peaks. The deviation of RI and thickness is 0.075 and zero, respectively. Results show that such a simple designed absorber could provide a desirable promising for terahertz-wave absorption and sensing applications.