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Phys Rev Lett. 2008 Jul 4;101(1):013901. Epub 2008 Jun 30.

Subdiffraction light focusing on a grating substrate.

Author information

  • 1Institut Fresnel (UMR 6133), Universit√© d'Aix-Marseille III, Avenue Escadrille Normandie-Niemen, F-13397 Marseille cedex 20, France. anne.sentenac@fresnel.fr

Abstract

We describe a way to generate subdiffraction light spots that can be moved over a surface without resorting to near-field manipulation, nonlinear effects, or negative index materials. We use a periodically patterned substrate that converted efficiently, through scattering, the impinging propagative waves into evanescent ones. Then we optimize the wave front of the incident propagative beam so that the grating-scattered evanescent waves interfere constructively at the focal point. Numerical simulations show that focus spots as small as one-sixth of a wavelength can be obtained at any point on the substrate. One foreseen application is high resolution surface imaging.

PMID:
18764111
[PubMed]
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