Tunable, directional and wavelength selective plasmonic nanoantenna arrays

Abstract

Linear arrays of noble metal nanoparticles, supporting Bragg plasmonic resonances, areproposed as optical nanoantennae. Electrodynamic calculations show that tunable,directional and wavelength selective emission enhancement is obtained throughout thevisible and near-infrared spectrum by varying the dielectric environment and thearray geometrical parameters, and thus tuning the Bragg modes. Large quantumefficiency enhancements are possible even in the case of poor emitters (1% intrinsicefficiency), spanning wavelengths that are relevant in lighting ( nm) and telecommunication () applications. Nanoantenna array angular emission is highly directional and extremelysensitive to the array geometrical parameters and the dielectric environment.