Observation of enhanced transmission for s-polarized light through a subwavelength slit
Optics Express, Vol. 18, Issue 9, pp. 9722-9727 (2010)
http://dx.doi.org/10.1364/OE.18.009722
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Abstract
Enhanced 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.
© 2010 OSA
OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(240.6680) Optics at surfaces : Surface plasmons
(310.2790) Thin films : Guided waves
ToC Category:
Diffraction and Gratings
History
Original Manuscript: March 19, 2010
Revised Manuscript: April 16, 2010
Manuscript Accepted: April 18, 2010
Published: April 23, 2010
Citation
M. Guillaumée, A. Yu. Nikitin, M. J. K. Klein, L. A. Dunbar, V. Spassov, R. Eckert, L. Martín-Moreno, F. J. García-Vidal, and R. P. Stanley, "Observation of enhanced transmission for s-polarized light through a subwavelength slit," Opt. Express 18, 9722-9727 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-9-9722
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