Long range surface plasmons on an asymmetric suspended waveguide geometry

Q. Min; C. Chen; Y. Pang; P. Berini; R. Gordon

doi:10.1117/12.872765

22 September 2010 Long range surface plasmons on an asymmetric suspended waveguide geometry

Q. Min, C. Chen, Y. Pang, P. Berini, R. Gordon

Proceedings Volume 7750, Photonics North 2010; 77502E (2010) https://doi.org/10.1117/12.872765
Event: Photonics North 2010, 2010, Niagara Falls, Canada

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.

Citation Download Citation

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); https://doi.org/10.1117/12.872765

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