Step impedance resonator-based tunable perfect metamaterial absorber with polarization insensitivity for solar cell applications

Abstract

In this work, a step impedance resonator (SIR)-based structure is proposed to develop a compact tunable metamaterial (MTM)-based perfect absorber for solar cell applications. This MTM absorber is able to improve the absorption over a wide range of visible frequency range from 550 to 650 THz. The absorption is high around the frequency 600 THz. The proposed model is designed based on SIR technique to achieve miniaturization. The parametric study of overall size of the proposed MTM absorber analyzed over the frequency range 430-750 THz. The thickness of dielectric spacer, and top most layer (MTM Structure) illustrates the tunable characteristics of the proposed model. A complete comparative analysis of proposed model with different dielectric spacers like AlGaAs, InAs, GaAs, and AlAs are presented with the help of absorption (S11) and transmission (S12). The proposed model is suitable for high efficiency solar cell energy harvesting applications.