Radiation-enhanced optical antenna based on nonperiodic metallic nanoparticle dimer chain
Department of Optics and Optical Engineering, University of Science and Technology of China Hefei, Anhui, 230026, PRC
Received: 29 May 2015
Accepted: 2 July 2015
With the aid of multi-sphere dyadic Green's function, we present a design of optical nanoantenna which is composed of a nonperiodic nanoparticle dimer chain. By breaking the periodicity of the dimer chain, the radiative emission of the dimer chain is significantly enhanced because the strong coupling which limits radiation enhancement is inhibited when the separations between dimers are reduced. Our work clearly shows the crucial role of nonperiodicity in the design of the Yagi-Uda nanoantenna.
PACS: 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) / 78.67.-n – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures / 78.67.Bf – Nanocrystals, nanoparticles, and nanoclusters
© EPLA, 2015