Unidirectional and Wavelength Selective Photonic Sphere-Array Nanoantennas

Abstract

We design a photonic sphere-array nanoantenna (NA) exhibiting both strong directionality and wavelength selectivity. Although the geometric configuration of the photonic NA resembles a plasmonic Yagi-Uda NA, it has different working principles, and most importantly, reduces the inherent metallic loss from plasmonic elements. For any selected optical wavelength, a sharp Fano-resonance by the reflector is tunable to overlap spectrally with a wider dipole resonance by the sphere-chain director leading to the high directionality. The work provides design principles for directional and selective photonic NAs, which is particularly useful for photon detection and spontaneous emission manipulation.

3 pages, 4 figures

References in corpus (1)

• On-command enhancement of single molecule fluorescence using a gold nanoparticle as an optical nano-antenna