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Negative role of surface plasmons in the transmission of metallic gratings with very narrow slits.

Qing Cao 1 Philippe Lalanne 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Naphel
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : It is generally admitted that the extraordinary transmission of metallic grating with very narrow slits is mainly due to the excitation of surface plasmons on the upper and lower interfaces of the grating. We show that the surface plasmon contribution is not the prime effect and that waveguide mode resonance and diffraction are responsible for the extraordinary transmission. Additionally and surprisingly, we reveal that the transmittance of subwavelength metallic gratings is always nearly zero for frequencies corresponding to surface plasmon excitation. This finding implies that surface plasmons play a negative role in the transmission.
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Qing Cao, Philippe Lalanne. Negative role of surface plasmons in the transmission of metallic gratings with very narrow slits.. Physical Review Letters, American Physical Society, 2002, 88 (5), pp.057403. ⟨10.1103/PhysRevLett.88.057403⟩. ⟨hal-00880400⟩

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