Waveguide-coupled nanowire as an optical antenna

We study the optical coupling between a gold nanowire and a silver ion-exchanged waveguide, with special emphasis on the nanowire antenna radiation pattern. We measure the radiation patterns of waveguide-coupled gold nanowires with a height of 70 nm and width of 50 or 150 nm in the 450-700 nm spectr...

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Published inJournal of the Optical Society of America. A, Optics, image science, and vision Vol. 30; no. 11; p. 2347
Main Authors Arnaud, Laurent, Bruyant, Aurélien, Renault, Mikael, Hadjar, Yassine, Salas-Montiel, Rafael, Apuzzo, Aniello, Lérondel, Gilles, Morand, Alain, Benech, Pierre, Le Coarer, Etienne, Blaize, Sylvain
Format Journal Article
LanguageEnglish
Published United States 01.11.2013
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Summary:We study the optical coupling between a gold nanowire and a silver ion-exchanged waveguide, with special emphasis on the nanowire antenna radiation pattern. We measure the radiation patterns of waveguide-coupled gold nanowires with a height of 70 nm and width of 50 or 150 nm in the 450-700 nm spectral range for TE and TM polarizations. We perform a systematic theoretical study on the wavelength, polarization, nanowire size, and material dependences on the properties of the radiation pattern. We also give some elements concerning absorption and near-field. Experiments and calculations show localized plasmon resonance for the polarization orthogonal to the wire (far-field resonance at 580 nm for the smallest wire and 670 nm for the widest). It is shown that a great variety of radiation patterns can be obtained, together with a high sensitivity to a change of one parameter, particularly near-resonance.
ISSN:1520-8532
DOI:10.1364/JOSAA.30.002347