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We present an analytical model of the resonantly enhanced transmission oflight through a subwavelength nm-size slit in a thick metal film. The simpleformulae for the transmitted electromagnetic fields and the transmissioncoefficient are derived by using the narrow-slit approximation and the Green'sfunction formalism for the solution of Maxwell's equations. The resonancewavelengths are in agreement with the semi-analytical model [Y. Takakura, Phys.Rev. Lett. 86, 5601 (2001)], which solves the wave equations by using theRayleigh field expansion. Our formulae, however, show great resonantenhancement of a transmitted wave, while the Rayleigh expansion model predictsattenuation. The difference is attributed to the near-field subwavelengthdiffraction, which is not considered by the Rayleigh-like expansion models.Comment: submitted to Appl. Phys. B, 8 December 2005; corrected typo

Analytical model of the enhanced light transmission through subwavelength metal slits: Green’s function formalism versus Rayleigh’s expansion