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Enhanced transmission of slit arrays in an extremely thin metallic film

Antoine Moreau, Christophe Lafarge, Nicolas Laurent, Kofi Edee, Gérard Granet

physics.opticsarXiv:physics/0606052

Abstract

Horizontal resonances of slit arrays are studied. They can lead to an enhanced transmission that cannot be explained using the single-mode approximation. A new type of cavity resonance is found when the slits are narrow for a wavelength very close to the period. It can be excited for very low thicknesses. Optimization shows these structures could constitute interesting monochromatic filters.

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