Near-field distribution of optical transmission of periodic subwavelength holes in a metal film.
Optical transmission of a two-dimensional array of subwavelength holes in a metal film has been numerically studied using a differential method. Transmission spectra have been calculated showing a significant increase of the transmission in certain spectral ranges corresponding to the excitation of the surface polariton Bloch waves on a metal surface with a periodic hole structure. Under the enhanced transmission conditions, the near-field distribution of the transmitted light reveals an intensity enhancement greater than 2 orders of magnitude in localized ( approximately 40 nm) spots resulting from the interference of the surface polaritons Bragg scattered by the holes in an array.
Salomon
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Laboratoirre de Physique de l'Université de Bourgogne, CNRS UPR 5027, Dijon, France.
Grillot
F
F
Zayats
A V
AV
de Fornel
F
F