Abstract
A three-layer adjustable THz wave absorber is introduced in this paper. The structure's geometry is heavily based on a combination of periodic graphene disks and their complementary patterns. Also, the middle layer is considered an air gap while the graphene patterns are stacked into TOPAS filler. Additionally, a golden back reflector is placed at the bottom of the absorber to ensure a blocked transmission channel. This configuration is modeled exclusively by passive circuit elements, while full wave simulation is also performed. Also, a simple genetic-based algorithm is exploited to optimize design parameters in numerical values, including geometrical and stimulation values. In addition, a mechanical tuning setup is suggested that can interestingly change absorption peaks. The frequency shift of absorption peaks can be up to 5 THz, which makes the proposed absorber an ideal basic building block for several applications ranging from sensing to indoor communication. Furthermore, the discussion section explains the potential applications of the proposed absorber for bio-sensing by filling the air gap with biological samples.
Published Version
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