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James R. Suckling, Alastair P. Hibbins, Matthew J. Lockyear, T. W. Preist, J. Roy Sambles, and Christopher R. Lawrence, Physical Review Letters, Vol. 92, article 147401 (2004). "Copyright Â© 2004 by the American Physical Society."Fabry-Perotâ\u80\u93like resonant transmission of microwave radiation through a single subwavelength slit in a thick aluminum plate is quantified for a range of slit widths. Surprisingly, and in contrast to previous studies [e.g., Y. Takakura, Phys. Rev. Lett. 86, 5601 (2001)], the resonant frequency exhibits a maximum as a function of slit width, decreasing as the slit width is reduced to less than 2% of the incident wavelength. This result accords with a new model based on coupled surface plasmon theory taking into account the finite conductivity, and hence permittivity, of the metal. This is contrary to a common assumption that metals can be treated as infinitely conducting in this regime

Finite Conductance Governs the Resonance Transmission of Thin Metal Slits at Microwave Frequencies