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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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Université de Franche-Comté, Institut FEMTO-ST UMR CNRS 6174, Département d'Optique P.M. Duffieux, 16 route de Gray, 25030 Besançon, France.


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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