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22 September 2010 Long range surface plasmons on an asymmetric suspended waveguide geometry
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Proceedings Volume 7750, Photonics North 2010; 77502E (2010)
Event: Photonics North 2010, 2010, Niagara Falls, Canada
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.
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Q. Min, C. Chen, Y. Pang, P. Berini, and R. Gordon "Long range surface plasmons on an asymmetric suspended waveguide geometry", Proc. SPIE 7750, Photonics North 2010, 77502E (22 September 2010);

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