Light extraction with dielectric nanoantenna arrays

摘要

SiO_2 and TiO_2 dielectric nanoparticles are arranged in linear arrays, supporting collective l modes, and employed as dielectric nanoantennae. Electrodynamic calculations show that strong, tunable lossless light extraction is obtained in a wide spectral range, including UV, visible, and near-infrared regions, in opposition to poor enhancement features of isolated dielectric nanoparticles. Emission quantum efficiencies comparable to those obtained employing metallic structures are achieved, with strong emission enhancement even for poor emitter position and dipole moment orientation.