MODELLING & SIMULATION OF TERAHERTZ PERFECT ABSORBER FOR VARIOUS INCIDENCE ANGLE

Abstract

Because of the developed fabrication and simulation technologies, the need for a perfect absorber that must be very thin and flexible is continuously increasing. There is a particular interest in developing a resonant metamaterial absorber by designing of refractive index n(ω) and impedance Z(ω) through which near unity absorption can be obtained at wide angle of incidence. Here I present a design and analysis of metamaterial perfect absorber for its response in frequency range of 0.6 THz to 1.4 THz through computer simulation using COMSOL Multiphysics 5.5. We tested the absorber's reaction to transverse magnetic and transverse electric polarizations at varied angles of incidence. It is important to note that our absorber was just 8 μm thick, that is it is highly flexible. I showed an absorptivity of 0.99 at 0.97 THz.