Numerical investigation of graphene-based efficient and broadband metasurface for terahertz solar absorber

Graphene-based efficient metasurface solar absorber is presented. Graphene monolayer sheet is integrated over silicon dioxide dielectric layer to improve the bandwidth and achieve maximum absorption in the visible region from 430 to 770 THz. Simulation results indicate that the average absorption of our graphene-based metasurface absorber is more than 84% in the visible range. The absorber C-shape metasurface top layer placed above the graphene sheet is made up of tungsten material, and bottom layer made up of tungsten material helps in absorbing incoming electromagnetic light. The resonance frequency can be tuned in a wide frequency range by changing different physical parameters of proposed absorbers design. The absorption efficiency results of the proposed design are also compared with previously published similar absorber design to show the improvement of absorption in the proposed design. The proposed design is useful for designing next-generation graphene-based sensors and photovoltaic devices. Purposed graphene-based metasurface absorber can be used as a basic building block of solar energy-harvesting photovoltaic devices.