Photo Excited Switchable Single-/Dual-Band Terahertz Meta Material Absorber
Abstract
This study presents the design of a photoexcited switchable Single/dual-function metamaterial absorber operating in the THz band, taking use of silicon's conductivity tuning as a function of incoming pump power. When the conductivity of silicon is 150 Sm1, the absorber exhibits a 99.6 percent absorption peak at 2.08 THz and may be utilized for sensing. Absorption peaks have a refractive index sensitivity of up to 456 GHz/RIU. When the conductivity is set at si = 12,000 Sm1, an absorption band with a bandwidth of 1.1 THz is produced between 3.4 THz and 4.5 THz. By measuring the electric and magnetic field distribution on the surface at certain absorption frequencies, we can understand the process that generates the sensing absorption peak and the wideband absorption. It has the potential for widespread use in areas including terahertz communication, electromagnetic stealth, and biochemical detection, and it's also quite easy to implement.Downloads
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