21 August 2009 Unidirectional coupler for surface plasmon polariton using total external reflection of high index material
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Abstract
The surface plasmon polaritons (SPPs) have been researched intensively, the very low coupling efficiency of the SPPs brings about difficulty in practical experiment. We proposed a unidirectional coupler for the SPPs using total external reflection. If the high-index dielectric is located on the left side of the slit, the SPPs toward the left side cannot propagate due to the cut-off property, and they should be totally reflected. By properly designing the structure parameter for constructive interference between the reflected Spp mode and the right-ward propagating SPP mode can happen, resulting in enhancement of the coupling efficiency of the SPPs.
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Seong-Woo Cho, Junghyun Park, Byoungho Lee, "Unidirectional coupler for surface plasmon polariton using total external reflection of high index material", Proc. SPIE 7420, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications III, 74200F (21 August 2009); doi: 10.1117/12.825768; https://doi.org/10.1117/12.825768
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