Tunable and polarization-sensitive graphene-based terahertz absorber with eight absorption bands

A metamaterial absorber consisting of stacked and orthogonal elliptical graphene layers is proposed to achieve eight absorption bands in the terahertz (THz) frequency range. By adjusting the length of the short or long axis for each graphene ellipse, the corresponding absorption peak can be tuned independently. Electric field distributions are present to reveal the physical mechanism. The absorption spectrum can also be tuned by varying the chemical potential of each graphene ellipse and the manipulation for the polarization angle of the incidence. Moreover, the absorber can work properly under oblique incidences. Our work paves a way for designing tunable THz absorbers with numerous absorption bands.

Automated summary

A metamaterial absorber made of stacked and orthogonal elliptical graphene layers has been proposed to achieve eight absorption bands in the terahertz frequency range, with the ability to independently tune absorption peaks by adjusting the length of each graphene ellipse's short or long axis. The absorption spectrum can also be tuned by varying the chemical potential of each graphene ellipse and manipulating the polarization angle of the incidence. The absorber is also able to function properly under oblique incidences, paving the way for the design of tunable terahertz absorbers with multiple absorption bands.