Abstract

Let us recall what the enhanced or extraordinary optical transmission (EOT) is. This phraseology was firstly used by T. W. Ebbesen’s team in 1998 to qualify the far-field light transmission obtained through an array of cylindrical apertures engraved into an opaque metallic film [1–5]. It was noticed that the normalized measured transmission per aperture is very large compared to the transmission of a single aperture. Thus, the collective response of the whole structure is at the origin of this extraordinary effect. Nevertheless, this phenomenon becomes more usual for holes of big diameters compared to the illumination wavelength.

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