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Observation of enhanced transmission for s-polarized light through a subwavelength slit

AuthorsNikitin, Alexey Y.; Martín-Moreno, Luis ; García-Vidal, F. J.
Issue DateApr-2010
PublisherOptical Society of America
CitationOptics Express 18(9): 9722-9727 (2010)
AbstractEnhanced optical transmission (EOT) through a single aperture is usually achieved by exciting surface plasmon polaritons with periodic grooves. Surface plasmon polaritons are only excited by p-polarized incident light, i.e. with the electric field perpendicular to the direction of the grooves. The present study experimentally investigates EOT for s-polarized light. A subwavelength slit surrounded on each side by periodic grooves has been fabricated in a gold film and covered by a thin dielectric layer. The excitation of s-polarized dielectric waveguide modes inside the dielectric film strongly increases the s-polarized transmission. A 25 fold increase is measured as compared to the case without the dielectric film. Transmission measurements are compared with a coupled mode method and show good qualitative agreement. Adding a waveguide can improve light transmission through subwavelength apertures, as both s and p-polarization can be efficiently transmitted.
Description6 páginas, 4 figuras.-- et al.
Publisher version (URL)http://dx.doi.org/10.1364/OE.18.009722
Appears in Collections:(ICMA) Artículos
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