This work reports on the plasmonic properties of a perovskite-based metal-insulator-metal nanostructure in the wavelength regime of 0.3–2.5 \(\mu \) m. In the nanostructure, an array of gold nanocylinders is placed on a perovskite layer, which is on top of an insulator layer and a metal thin layer. The light absorbance of the structure is numerically simulated using the finite-difference time-domain method. Multiple resonances are identified, and the electric fields are also probed, corresponding to various modes. The effects of the perovskite layer on the nanostructure are demonstrated by varying the thickness and the refractive index of the perovskite. The tunability of the resonances is also revealed, and the results in this work show that a proper perovskite with certain refractive indices may be useful in designs of metal-insulator-metal nanostructures.
