Open AccessFractal extensions of near-field aperture shapes for enhanced transmission and resolution
Author(s) -
Joseph A. Matteo,
Lambertus Hesselink
Publication year - 2005
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.13.000636
Subject(s) - optics , aperture (computer memory) , fractal , transmission (telecommunications) , image resolution , resolution (logic) , physics , field (mathematics) , near and far field , spatial frequency , extraordinary optical transmission , surface plasmon , mathematics , computer science , telecommunications , mathematical analysis , surface plasmon polariton , plasmon , acoustics , artificial intelligence , pure mathematics
Families of fractals are investigated as near-field aperture shapes. They are shown to have multiple transmission resonances associated with their multiple length scales. The higher iterations exhibit enhanced transmission, and spatial resolution exceeding the first order. Near-field enhancements of greater than 400 times the incident intensity and resolutions of better than ?/20 have been shown with apertures modeled after third iteration prefractals. Enhancements as large as 1011 have been shown, when compared with conventional square apertures that produce the same spot size. The effects of the complex permittivity values of the metal film are also addressed.