Authors
Laurent Arnaud, Aurélien Bruyant, Mickael Renault, Yassine Hadjar, Rafael Salas-Montiel, Aniello Apuzzo, Gilles Lérondel, Alain Morand, Pierre Benech, Etienne Le Coarer, Sylvain Blaize,
Title
Waveguide-coupled nanowire as an optical antenna
In
Journal of the Optical Society of America A: Optics and Image Science, and Vision
Volume
30
Issue
11
Pages
2347–2355
Publisher
Optical Society of America
Year
2013
Publisher's URL
http://www.opticsinfobase.org/josaa/abstract.cfm?uri=josaa-30-11-2347
Indexed by
Abstract
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.
Affiliations
Offprint