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Transmission through sub-wavelength apertures in perfect metals is expectedto be strongly suppressed. However, by structural engineering of the apertures,we numerically demonstrate that the transmission of transverse electric wavesthrough periodic arrays of subwavelength apertures in a thin metallic film canbe significantly enhanced. Based on equivalent circuit theory analysis,periodic arrays of square structured subwavelength apertures are obtained witha 1900-fold transmission enhancement factor when the side length $a$ of theapertures is 10 times smaller than the wavelength ($a/\lambda=0.1$). Byexamining the induced surface currents and investigating the influence of thelattice constant and the incident angle to the resonant frequency, we show thatthe enhancement is due to the excitation of the strong localized resonant modesof the structured apertures.

Enhanced transmission of transverse electric waves through periodic arrays of structured subwavelength apertures