Achieving Strong Field Enhancement and Light Absorption Simultaneously with Plasmonic Nanoantennas Exploiting Film-Coupled Triangular Nanodisks

Abstract

Plasmonic nanoantennas (PNs) comprised of film-coupled or in-plane coupled nanoparticles have been exploited for light confinement or field enhancement. However, achieving strong local electric field enhancements (\\Eloc\\/\\E0\\ > 100) and near-perfect absorption (>95%) simultaneously remains a challenge, although it will benefit a wide range of applications. Here Ag/Al2O3/Au PNs are proposed by introducing high-density triangular nanodisks into film-coupled systems, which can produce dense \\