Role of commensurate arrangements in the optical response of metallic gratings

Details Role of commensurate arrangements in the optical response of metallic gratings Role of commensurate arrangements in the optical response of metallic gratings

2007-06-26

arxiv.org/abs/0706.3843v2

Physics

Condensed Matter

Other Condensed Matter

5 pages, 5 figures, submitted to Phys. Rev. Lett. May 2007

Scientific paper

Light localization on commensurate arrangements of metallic sub-wavelength grooves is studied. We theoretically show that as the degree of commensuration tends to an irrational number new light localization states are produced. These have properties close to that reported for hot spots on disordered surfaces and are not permitted for simple period gratings. Some theoretical predictions are experimentally provided in the infra-red region by reflectivity measurements performed on two commensurate samples with respectively two and three slits per period.

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