Abstract
A tunable graphene terahertz metamaterial absorber is designed by treating a monolayer continuous dumbbell-shaped structure graphene layer, which can simultaneously realize the narrow bandwidth and dual-band absorption with transverse magnetic (TM) polarization and wide incident angle operation. Two pronounced absorption peaks are caused by the novel toroidal dipole phenomenon and magnetic plasmon polariton. By optimizing the geometry parameters, the relative narrow bandwidths of the two absorption peaks are 26.4 GHz and 23.5 GHz at frequencies of 0.2242 THz and 0.5302 THz, respectively, with the absorption rate above 99.6%. Since the continuous dumbbell-shaped graphene structure is treated in the absorber, a more convenient way to realize the tuning ability by treating a bias voltage compared to the absorbers with discrete graphene structures. The designed device can work at a wide incident angles (up to 80°) under TM polarization with the absorption above 88% at low frequency. The simulation results are basically in good agreement with the results of the equivalent circuit model. This work offers huge potential applications in terahertz imaging, detecting and sensing, especially in the 6G communication systems.
Highlights
The standardization of fifth generation (5G) communications has been finished, and the 5G network will be built into commercial applications in 2020
The results demonstrate that the absorption can reach 99.62 and 99.76% at 0.2242 and 0.5302 THz with the extreme narrow bandwidths as low as 26.4 and 23.5 GHz, respectively
A tunable dumbbell-shaped narrow-bandwidth dual-band terahertz perfect absorber based on a monolayer continuous graphene meta-surface is designed and investigated in this paper
Summary
The standardization of fifth generation (5G) communications has been finished, and the 5G network will be built into commercial applications in 2020. The operating characteristics of the DSF absorber can be dynamically tuned by changing the Fermi level instead of structure geometry parameters They reported a tunable broadband metamaterial sandwichstructured terahertz absorber containing black phosphorous and vanadium dioxide [29]. Motivated by the previous studies, in this work, a dual-band tunable metamaterial absorber with narrow bandwidth in the terahertz region is designed by using a simple sandwich structure. The absorption characteristics of the designed metamaterial absorber are analyzed by optimizing different parameters of graphene geometry, substrate thickness, and incident angle of terahertz wave. These excitations will couple with the free-space radiation and result in the absorption characteristics of the metamaterial structure [36]. The electric field of terahertz wave paralleled to the x axis is defined the TM polarization while the electric field paralleled to the y axis is TE polarization
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