Porous Gold Nanolayer Coated Halide Metal Perovskite-Based Broadband Metamaterial Absorber in the Visible and Near-IR Regime

Investigation of the optical response of metal-perovskite configuration-based hyperbolic metamaterials (HMMs) was made toward achieving nearly-perfect absorption in the 300–900 nm wavelength span. More precisely, the HMM structure comprised of periodically arranged gold (Au) and methyl ammonium lead iodide (MAPbI3) nanolayers was taken. The results were derived by exploiting the effective medium theory and transfer matrix method. The proposed HMM was found to exhibit nearly-perfect absorption in a regime of 400–800 nm. In order to achieve better uniformity in the wideband absorption, the structure was also modified by replacing the top Au-nanolayer with a porous Au-nanolayer. The analyses of the modified configuration revealed perfect absorption (>99%) for a wide range of incidence angles corresponding to the TM-polarized incidence excitations in the UV and visible regimes. However, the spectra corresponding to the TE-polarized waves exhibited over 70% absorption only. It is expected that this configuration would find potentials in solar energy harvesting, biosensing and active photonic devices.

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