Abstract
We consider a metal film with a single sub-wavelength diameter hole surrounded by corrugations on one surface. This structure exhibits a resonance with peak optical transmission 125 times greater than that of a simple hole without corrugations. We present measurements and calculations which lead us to conclude that this enhancement in transmission is well explained by a localized resonance characterized by strong enhancement of the optical fields on the corrugated side of the film together with evanescent coupling through the hole. We discuss the distinction that must be made between this case, in which the cylindrical hole functions as a cut-off waveguide, and the case of two-dimensional slits which exhibit no cut-off and allow propagation at any wavelength.
© 2002 Optical Society of America
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