Send to

Choose Destination
See comment in PubMed Commons below
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.


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.

PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for American Physical Society
    Loading ...
    Support Center