Strong influence of hole shape on extraordinary transmission through periodic arrays of subwavelength holes.

By K. K. Koerkamp, Stefan Enoch, Frans Segerink, N. V. Hulst, L. Kuipers. Physical Review Letters, 2004

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The role of localized surface plasmon modes in the enhanced transmission of periodic subwavelength apertures (2005, background): “Recently it was suggested that aperture ‘shape resonances’ play a role in the transmission of hole arrays [43].”
A microscopic view of the electromagnetic properties of sub-λ metallic surfaces (2009, result): “ontributions, a resonant channel (the surface modes) and a nonresonant scattering background, and which accounts for the observed spectral profiles peculiar to the detailed geometry of the hole array [88] without explicitly specifying the nature of the resonant channel. In an attempt to fully explai”
Colloquium: Light scattering by particle and hole arrays (2007, background): “6(a) occurs where Gxx is less steep], just as observed experimentally (Gordon et al., 2004; Klein Koerkamp et al., 2004).”
Light passing through subwavelength apertures (2010, background): “The role of the individual holes in the EOT phenomenon in 2D hole arrays becomes important when the shape of the holes is changed from circular or square to rectangular Koerkamp et al., 2004 .”