Efficient excitation of cavity resonances of subwavelength metallic gratings

Details Efficient excitation of cavity resonances of subwavelength metallic gratings Efficient excitation of cavity resonances of subwavelength metallic gratings

2004-06-07

arxiv.org/abs/physics/0406028v1

Physics

Optics

4 pages, 5 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1063/1.1854727

One dimensional rectangular metallic gratings enable enhanced transmission of light for specific resonance frequencies. Two kinds of modes participating to enhanced transmission have already been demonstrated : (i) waveguide modes and (ii) surface plasmon polaritons (SPP). Since the original paper of Hessel and Oliner \cite{hessel} pointing out the existence of (i), no progress was made in their understanding. We present here a carefull analysis, and show that the coupling between the light and such resonances can be tremendously improved using an {\it evanescent} wave. This leads to enhanced localisation of light in cavities, yielding, in particular, to a very selective light transmission through these gratings.

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