Unidirectional and Wavelength Selective Photonic Sphere-Array Nanoantennas
Title | Unidirectional and Wavelength Selective Photonic Sphere-Array Nanoantennas |
Publication Type | Journal Article |
Year of Publication | 2012 |
Authors | Liu, Yang G., Choy Wallace C. H., Sha Wei E. I., and Chew Weng Cho |
Journal | Optics Letters |
Volume | 37 |
Issue | 11 |
Start Page | 2112-2114 |
Date Published | 06/2012 |
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 high directionality. This Letter provides design principles for directional and selective photonic NAs, which are particularly useful for photon detection and spontaneous emission manipulation. |
DOI | 10.1364/OL.37.002112 |
Refereed Designation | Refereed |