Physics – Optics
Scientific paper
2006-02-27
Physics
Optics
submitted to Appl. Phys. B, 8 December 2005; corrected typos
Scientific paper
10.1007/s00340-006-2272-4
We present an analytical model of the resonantly enhanced transmission of light through a subwavelength nm-size slit in a thick metal film. The simple formulae for the transmitted electromagnetic fields and the transmission coefficient are derived by using the narrow-slit approximation and the Green's function formalism for the solution of Maxwell's equations. The resonance wavelengths are in agreement with the semi-analytical model [Y. Takakura, Phys. Rev. Lett. 86, 5601 (2001)], which solves the wave equations by using the Rayleigh field expansion. Our formulae, however, show great resonant enhancement of a transmitted wave, while the Rayleigh expansion model predicts attenuation. The difference is attributed to the near-field subwavelength diffraction, which is not considered by the Rayleigh-like expansion models.
Janssens Koen
Kukhlevsky S. V.
Mechler Matyas
Samek Ota
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