Open AccessResonant infrared transmission and effective medium response of subwavelength H-fractal apertures
Author(s) -
Bo Hou,
Xin Qing Liao,
Joyce K. S. Poon
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.003946
Subject(s) - optics , aperture (computer memory) , wavelength , extraordinary optical transmission , fractal , materials science , surface plasmon , metamaterial , diffraction , infrared , permittivity , plasmon , optoelectronics , physics , surface plasmon polariton , dielectric , mathematical analysis , mathematics , acoustics
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.