Marcelo Lester and Diana C Skigin 2007 J. Opt. A: Pure Appl. Opt. 9 81 doi:10.1088/1464-4258/9/1/014
Marcelo Lester1 and Diana C Skigin2
Show affiliationsIn this paper we show that enhanced optical transmission through a 1D periodic slit array comprising real metallic cylinders is possible for s-polarization when the array is near a dielectric interface. We investigate the behaviour of this structure under s-polarized illumination, in which case surface plasmons are not excited. Numerical results show that the transmitted intensity appears as a periodic function of the slit depth, for propagating as well as for evanescent incidence, suggesting that this behaviour is related to the excitation of waveguide modes in the slits. In particular, the coupling of evanescent to propagating electromagnetic waves is investigated. It is shown that s-polarized evanescent waves generated at the interface can be transformed into propagating waves if the optical width of the slits allows propagation of the first waveguide mode. As the interface approaches the array, the transmitted intensity increases for evanescent incidence.
42.25.Bs Wave propagation, transmission and absorption
Issue 1 (January 2007)
Received 1 September 2006, accepted for publication 3 November 2006
Published 28 November 2006
Marcelo Lester and Diana C Skigin 2007 J. Opt. A: Pure Appl. Opt. 9 81
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