Impact Statement:A dual-band perfect absorber composed of cross- and disk-shaped graphene array is designed. Nearly 100% absorption can be obtained at the wavelengths of 43.747um and 69.9...Show More
Abstract:
A three-dimensional dual-band perfect absorber in the THz range (3-10 THz) is theoretically investigated. The absorber is composed of periodically placed cross-and disk-s...Show MoreMetadata
Impact Statement:
A dual-band perfect absorber composed of cross- and disk-shaped graphene array is designed. Nearly 100% absorption can be obtained at the wavelengths of 43.747um and 69.94um, and it is polarization-insensitive and exhibits good absorption stability over a wide incident angle range for both TE and TM wave. The tunability is also explored by changing the Fermi level and the relaxation time of the graphene. This work paves a new way for the graphene-based THz tunable compact photonic devices.
Abstract:
A three-dimensional dual-band perfect absorber in the THz range (3-10 THz) is theoretically investigated. The absorber is composed of periodically placed cross-and disk-shaped graphene arrays on the top of a gold layer separated by a thick SiO2 dielectric spacer. The simulated results show two absorption peaks with near-unity absorbance (99.923% and 99.601%) at wavelengths 43.747 μm and 69.94 μm, respectively. Also, the absorber is insensitive to the polarization of the incident light and has a good tolerance to the incident angle whether it is TE or TM waves. Moreover, the peak wavelengths of the absorber can be flexibly modulated by varying the Fermi level μC of graphene while no need to refabricate the structure. This paper provides a new perspective for the design of graphene-based tunable multiband perfect THz absorbers, but not limited to THz absorbers, and may also be used in other THz graphene-based photonic devices.
Published in: IEEE Photonics Journal ( Volume: 10, Issue: 2, April 2018)
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