Broadband Metasurface Solar Absorber

Abstract

The work presented in this thesis channel through the study and numerical design investigation of different metasurface structural designs and configurations for potential electromagnetic wave absorption ranging from IR to visible region of the light spectrum. The design and performance investigation of the proposed metasurface structures included full-wave electromagnetic simulation and extracting the absorption and reflection profile of the structures. newlineThe initial design explored in this research is a C-shaped metallization structure, which is model on a Graphene monolayer sheet that is integrate over silicon dioxide layer to enhance the bandwidth of absorption spectra profile of the metasurface structure in the visible region from 430 THz to 770 THz. The simulation results showed more than 84 % absorption of the electromagnetic waves in the visible spectrum. It have observe that designing a metasurface using tungsten material and placing it above a graphene sheet with bottom layer again made up of tungsten material helps in improving the absorption of the incident electromagnetic radiation. Further, the shape of the top layer metallization also plays an important role improving the absorption efficiency of the metamaterial design. In this connection, the initial design of the metasurface have modify into periodic arrangement of C-shaped metallization based on rectangular strip pattern of the graphene. In this case, not only the absorption spectrum have broaden ranging from IR, visible region, and ultraviolent region, but an increase in the absorption efficiency have seen up to 86.5 %. The optimization of the C-shaped structure using rectangular saw-tooth pattern on the outer and inner edge helped in further increasing the absorption efficiency to 91.8 % in the near infrared region. newline