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Opt Express. 2010 Feb 15;18(4):3946-51. doi: 10.1364/OE.18.003946.

Resonant infrared transmission and effective medium response of subwavelength H-fractal apertures.

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The Edward S. Rogers Sr. Department of Electrical and Computer Engineering, Institute for Optical Sciences, University of Toronto, Toronto, ON M5S 3G4, Canada.


The transmission through periodic arrays of subwavelength H-fractal apertures in a gold film at infrared wavelengths is investigated numerically. H-fractal apertures support subwavelength cut-off resonances that are hybridized with surface plasmons along the sidewalls of the aperture. Enhanced transmission occurs at wavelengths that are about ten times the aperture side length. The highly subwavelength size scale of the H-fractal enables an effective medium parameter description for the aperture array, which reveals a lossy plasma permittivity and a diamagnetic permeability.

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