Broadband graphene‐based metasurface solar absorber

Abstract

We presented broadband solar absorber using graphene‐based pyramid‐shaped metasurface structure. The proposed design is analyzed for its absorption characteristics from 100 THz to 1000 THz frequency range (infrared, visible, and ultraviolet region) in term of geometrical parameters of the design. Results in term of reflectance and absorption are presented for pyramidal metasurface design and rectangular metasurface design. The results indicate that the absorption of proposed pyramid graphene‐based metasurface design is over 67.4% for 100 to 430 THz across the infrared region, 87.3% for 431 to 770 THz across the visible region and 89.3% for 770 to 1000 THz across the ultraviolet region. The proposed design provides broadband absorption response which is applicable in energy harvesting and electromagnetic shielding applications.

Dynamic Absorption Enhancement and Equivalent Resonant Circuit Modeling of Tunable Graphene-Metal Hybrid Antenna

“…At the same time, g is the geometric parameter that represents the strength of coupling between the radiative plasmonic mode with the incident infrared radiation. Solving Equations (15) and (16), the susceptibility for the proposed antenna model can be expressed, as [50],…”

“…Graphene has been a promising candidate for tunable absorption handling and reconfigurability of resonant wavelength over a broad range of optical frequencies [15]. The dielectric permittivity and conductivity of graphene at optical frequency ranges are dynamically tunable, through the modulation of the carrier density under gate-controlled electrostatic bias, by permitting and prohibiting the generation and propagation of plasmons in the graphene sheet [16]. Thus, the tunable conductivity of graphene has been widely utilized for nanoscale devices in optical and terahertz regimes.…”

Suppressing Edge Back-Scattering of Electromagnetic Waves Using Coding Metasurface Purfle

“…Afterwards, there have been several different geometrical shapes that were implemented [6][7][8][9][10][11][12]. From the perspective of material property design, the methods for edge scattering suppression include the use of edge corrugations, resistive taper loading, and edge coatings, etc., which have received considerable attention [13][14][15][16][17][18][19][20][21][22][23][24]. In addition, other related works include using inhomogeneous anisotropic impedance surfaces to guide surface waves with the purpose of suppressing the scattering of the hypotenuse of triangular scatterer [25] and using hard and soft anisotropic impedance surfaces to redirect the back-scattering [26].…”

An approach for circuit modeling of a multiband resonators based planar metamaterial absorber

“…Metamaterial absorbers are extensively investigated in various frequency regimes with the main emphasis on the design of compact, ultrathin, and multi/wideband structures with nearunity polarization-insensitive absorption. [1][2][3][4] Metamaterial absorber structures are usually designed and analyzed using various numerical techniques (like MoM, FDTD, and FEM) based commercial electromagnetic solvers utilizing periodic boundary conditions that incorporate the coupling effects of neighboring unit cells into the calculation. These calculations are fast, robust, and accurate based on the proper meshing criteria.…”