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

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

2009-12-12

arxiv.org/abs/0912.2452v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 3 figures, submitted to Applied Physics Letters

Scientific paper

Enhanced optical transmission (EOT) through subwavelength apertures is usually obtained for p-polarized light. 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. Transmission measurements are compared with a coupled mode model 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.

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