A multi-band star-shaped graphene-based absorber in THz regime

In this paper, a triple-band star-shaped graphenebased absorber with three over 90% absorption bands is introduced. These absorption bands include 1.18-2.71 THz, 4.02-4.22 THz, and 5.89-7.30 THz. The proposed structure is highly efficient and has 162.5% (6.65 THz) absorption bandwidth considering 70% absorption level. Instead of multilayer and multi-shaped conventional structures, a single-layer structure is presented based on gradient width modulation method utilizing continuous surface plasmon resonances. Comparing to conventional works on dualband and wideband absorbers, the proposed structure includes the benefits of one layer structure and simple shape geometry resulting in easy fabrication and compactness. Moreover, the electrically tunable property of the proposed multiband absorber is investigated. This structure has the advantage of simple geometry for manufacture resulting to applicability in lots of applications including sensors and attenuator devices.

کلیدواژه ها:

absorber ، graphene ، terahertz regime ، metamaterial.