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Proceedings Paper

Design of a metal-dielectric subwavelength slit structure for high efficiency coupling of surface plasmon polaritons
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Paper Abstract

We propose a high efficiency coupling scheme of surface plasmon polaritons (SPP) in a metal-dielectric slit structure. The design includes a narrrow silver-slit structure, which is immersed in a dielectric with refractive index 1.5. We map the dependence of SPP coupling efficiency on the dielectric layer thickness (d). By varying d the dispersion behavior of the SPP mode is tuned enabling minimized wavevector mismatch between the light exiting the slit and the SPP mode. A dielectric layer of thickness in the range 50 nm < d < 150 nm yields coupling efficiencies of approximately 80%, representing a nearly four-fold enhancement relative to the coupling efficiency without a dielectric layer.

Paper Details

Date Published: 8 September 2011
PDF: 7 pages
Proc. SPIE 8007, Photonics North 2011, 800729 (8 September 2011); doi: 10.1117/12.915601
Show Author Affiliations
Reyad Mehfuz, The Univ. of British Columbia (Canada)
Kenneth J. Chau, The Univ. of British Columbia (Canada)

Published in SPIE Proceedings Vol. 8007:
Photonics North 2011
Raman Kashyap; Michel Têtu; Rafael N. Kleiman, Editor(s)

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