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Proceedings Paper

Long range surface plasmons on an asymmetric suspended waveguide geometry
Author(s): Q. Min; C. Chen; Y. Pang; P. Berini; R. Gordon
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Paper Abstract

We propose a physically asymmetric thin film structure to support long-range surface plasmons (LRSPs), which consists of a low index medium on a metal film on a dielectric layer (membrane) over air, as a suspended waveguide. An analytic formulation is derived in 1D geometry yielding a transcendental equation that ensures symmetry of the transverse fields of the LRSP within the metal film by properly configuring the thicknesses of the metal film and the membrane. The theoretic results from the formulation agree with the transfer matrix calculations quantitatively for a candidate slab waveguide consisting of an H2O-Au-SiO2-air structure. These results are promising for sensors that operate with an aqueous solution that would otherwise require a low refractive index substrate to achieve LRSP guiding.

Paper Details

Date Published: 22 September 2010
PDF: 7 pages
Proc. SPIE 7750, Photonics North 2010, 77502E (22 September 2010); doi: 10.1117/12.872765
Show Author Affiliations
Q. Min, Univ. of Victoria (Canada)
C. Chen, Univ. of Ottawa (Canada)
Y. Pang, Univ. of Victoria (Canada)
P. Berini, Univ. of Ottawa (Canada)
R. Gordon, Univ. of Victoria (Canada)

Published in SPIE Proceedings Vol. 7750:
Photonics North 2010
Henry P. Schriemer; Rafael N. Kleiman, Editor(s)

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