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.
© 2012 Optical Society of AmericaFull Article | PDF Article
Brice Rolly, Brian Stout, Sebastien Bidault, and Nicolas Bonod
Opt. Lett. 36(17) 3368-3370 (2011)
Se-Heon Kim, Jingqing Huang, and Axel Scherer
J. Opt. Soc. Am. B 29(4) 577-588 (2012)
S. H. Alavi Lavasani and Tavakol Pakizeh
J. Opt. Soc. Am. B 29(6) 1361-1366 (2012)