Abstract
The optical performance of a periodically tunable plasma perfect metamaterial absorber based on a square-square-circle array we propose in the terahertz region is analyzed in this work by the finite difference time domain (FDTD) method. We not only discuss the impact of various parameters such as period a, length L, radius R, and incident angle θ under transverse magnetic (TM)- and transverse electric (TE)-polarization on the absorption spectra of the absorber but also study the effect of the Fermi energy EF and relaxation time τ. Finally, we simulate the spectra as the surrounding refractive index n changes to better evaluate the sensing performance of the structure, producing a sensitivity S of the structure of up to 15006 nm/RIU. On account of this research, we find that the absorber is beneficial to sensors and detectors in the terahertz region.
Highlights
Whether through the development of terahertz technology [1,2,3,4] or the development of perfect absorbers [5,6,7], the emergence of metamaterials has undoubtedly played a role in promoting them
It can be clearly seen that the electric field is localized at both ends of the structure, which is caused by the strong electric dipole resonance. This resonance can effectively catch the energy of light and produces enough time to eliminate the ohm loss in graphene
We analyzed the optical performance of a periodical tunable plasmonic perfect metamaterial absorber based on a square-square-circle graphene array that we proposed in the terahertz region, by finite difference time domain (FDTD)
Summary
Whether through the development of terahertz technology [1,2,3,4] or the development of perfect absorbers [5,6,7], the emergence of metamaterials has undoubtedly played a role in promoting them. We can see that the resonance wavelength has a blue shift and the absorption peak is almost unchanged with the incremental period. The symmetry of the perfect metamaterial absorber design keeps the absorption almost unchanged with various periods [54].
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