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

Reyad Mehfuz; Kenneth J. Chau

doi:10.1117/12.915601

8 September 2011 Design of a metal-dielectric subwavelength slit structure for high efficiency coupling of surface plasmon polaritons

Reyad Mehfuz, Kenneth J. Chau

Author Affiliations +

Proceedings Volume 8007, Photonics North 2011; 800729 (2011) https://doi.org/10.1117/12.915601
Event: Photonics North 2011, 2011, Ottawa, Canada

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.

Citation Download Citation

Reyad Mehfuz and Kenneth J. Chau "Design of a metal-dielectric subwavelength slit structure for high efficiency coupling of surface plasmon polaritons", Proc. SPIE 8007, Photonics North 2011, 800729 (8 September 2011); https://doi.org/10.1117/12.915601

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