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The light transmission through a square array of circular holes in a metal film has been studied theoretically, taking into account the diffraction modes and the surface plasmons. The calculations are in good agreement with experimental results. By studying the dependence of the transmission spectrum on the structural parameters of the hole array, we show that the transmission peaks are strongly correlated with the waveguide modes inside the cylindrical holes. Associated with the propagation characteristics (propagating or evanescent) of the waveguide modes, Fabry–Perot resonance in the circular holes or extended surface resonance on the metal films would give rise to the transmission peaks.
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Zhang et al. (2009) studied this question.
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