Comparative Analysis of Plasmonic Metamaterial Absorber for Noble, Alkaline Earth and Transition Metals in Visible Region

摘要

High Absorption efficiency is necessary for applications like solar cells and photodetectors. Perfect plasmonic resonance absorbers are of immense interest for the researchers as they provide greater benefits such as small size, better flexibility and greater efficacy as compared to standard absorbers. In this paper, comparative analysis has been performed on the basis of radiation properties that is absorptivity, reflectivity and transmittivity for noble, alkaline and transition metals for the entire visible spectrum. Metamaterial absorber with gold as the top metal proves to be the best absorber with highest absorptivity of 0.963, reflectivity of 0.037 followed by silver (absorptivity = 0.883 and reflectivity = 0.117) and copper (absorptivity = 0.852 and reflectivity = 0.148) at a wavelength of 1317. 88nm. Maximum absorptivity in gold is observed because of its distinct optical properties that lead to strong localized electric and magnetic dipole resonances. Transmittivity drops to the minimum value in the range of 700-1500 nm which meets the requirement for designing of a good absorber.