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J Microsc. 2008 Feb;229(Pt 2):354-64. doi: 10.1111/j.1365-2818.2008.01912.x.

Annular nanoantenna on fibre micro-axicon.

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1
Université de Franche-Comté, Institut FEMTO-ST UMR CNRS 6174, Département d'Optique P.M. Duffieux, 16 route de Gray, 25030 Besançon, France. thierry.grosjean@univ-fcomte.fr

Abstract

In this paper, we propose to extend the concept of loop antenna to the optical domain. The aim is to develop a new generation of optical nanocollectors that are sensitive to specific electric or magnetic vectorial field components. For validating our approach, a preliminary one-micron-diameter gold nanoring is micromachined on the apex of a cone lens obtained from a tapered optical fibre. It is shown that such a nano-object behaves as a nano-antenna able to detect the longitudinal electric field from a Bessel beam in radial polarization and the longitudinal magnetic component from a Bessel beam in azimuthal polarization. In the latter case, the annular nano-antenna exhibits the properties of an optical inductance.

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