Abstract

Plasmonic metamaterials based on random metallic nanostructures on mirror were proposed to tune the optical properties due to the surface plasmon (SP) resonance in a flexible manner. The SP resonance peaks were enhanced and dramatically sharpened, and flexibly tuned by optimizing the thickness of the spacer layer between the metal hemisphere and the metal substrate. We verified both experimentally and numerically that structures enable tuning of the localized SP resonance in the deep UV and near IR wavelength regions, respectively. Plasmonic metamaterials proposed here is envisaged to lead to the development of new applications and technologies in the field of plasmonics and nanophotonics.

© 2021 The Author(s)