Extraordinary grating-coupled microwave transmission through a subwavelength annular aperture
Author
Caglayan, H.
Bulu, I.
Özbay, Ekmel
Date
2005-03-07Source Title
Optics Express
Print ISSN
1094-4087
Publisher
Optical Society of America
Volume
13
Issue
5
Pages
1666 - 1671
Language
English
Type
ArticleItem Usage Stats
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Abstract
We studied coupling phenomena between surface plasmons and electromagnetic waves in the microwave spectrum using circular apertures surrounded by array of grooves. We first present experimental and theoretical results of enhanced microwave transmission though a subwavelength circular aperture with concentric periodic grooves around the surface plasmon resonance frequency. This is followed by transmission studies through circular annular apertures and circular annular apertures surrounded by concentric periodic grooves. We demonstrated that 145 fold enhancement factor could be obtained with a subwavelength circular annular aperture surrounded by concentric periodic grooves. Our results show that, high transmission from a circular annular aperture with grooves is assisted by the guided mode of the coaxial waveguide and coupling to the surface plasmons. (C) 2005 Optical Society of America.
Keywords
Enhanced Light TransmissionOptical-transmission
Metallic Gratings
Hole Arrays
Surface-plasmons,radiation
Films