Abstract

A dual-band absorber using monolayer periodically T-shaped slot-patterned graphene at terahertz frequencies is presented. By changing the dimensions or Fermi levels of the T-shaped slot-patterned graphene, both of the two absorption bands will be adjusted. The absorber has the characteristics of polarization independence and incident angle insensitivity. Also, its complementary structure, i.e., using periodically T-shaped strip-patterned graphene, is investigated to design another dual-band absorber. Moreover, two triband absorbers are studied through periodically loading four more T-shaped slots and complementary strips in square graphene lattices, respectively. This paper provides a significant paradigm for designing different graphene-based absorbers with multiple absorption bands.

© 2020 Optical Society of America

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