Unidirectional and wavelength-selective photonic sphere-array nanoantennas

Yang G. Liu, Wallace C.H. Choy, Wei E.I. Sha, Weng Cho Chew

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Pages (from-to)2112-2114
Number of pages3
JournalOptics Letters
Issue number11
StatePublished - Jun 1 2012
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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