Engineering of Ultra-wide Bandwidth Metamaterial Absorber with Various Shaped Resonators in the Visible to Far-Infrared Spectrum

We have theoretically investigated the engineering of a highly efficient metamaterial (MTM) absorber with nanocircular ring resonators of nickel (Ni) metal for the absorption of visible to far-infrared (400 nm to 4000 nm). A metal–insulator-metal structure is used in the design of the proposed MTM absorber. We have observed the high absorption values with varying top resonator designs Ni-metal compared to other considered metals. The proposed absorber exhibits an average absorption of 95.34% for transverse electric (TE) and transverse magnetic (TM) modes for wavelengths 400 nm to 4000 nm. The CST simulation software analyzes the absorber’s properties for different structural parameters. The average absorption is attained over 90% at different incidence angles and independent of polarization angles. Moreover, we have investigated the absorption performance using various structural characteristics. Short-circuit current densities (Jsc) are investigated using a global air mass of 1.5 (AM1.5) solar spectrum at various incidence angles. The proposed absorber containing Ni metal nanoresonators is designed as an alternative for thermal, emission, photovoltaic, and energy harvesting applications due to its attractive functionality, including geometry, cost, polarization insensitivity, large bandwidth, and thermal robustness.