Abstract
In this paper, one kind of polarization independent terahertz perfect absorber of narrow band based on cross and open ring structure of graphene is proposed. The effects of Fermi energy level and structure size of graphene on the absorption characteristics of meta-material absorber were studied by using CST electromagnetic simulation software. The physical mechanism is explained by impedance matching theory. The results show that when the Fermi energy level of graphene is 0.5 eV, the radius of inner ring is 8 μm, the radius of outer ring is 11.5 μm, the width of cross is 1.5 μm, and the thickness of silica dielectric layer is 10 μm,, the absorber can realize 98% perfect absorption in 4.48 THz. Moreover, due to the symmetry of the structure, the absorber is independent of polarization. This result has great applications for the realization of ultra-thin tunable smart devices in the terahertz band by using patterned graphene.
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