9 October 2012 Taking cascaded plasmonic field enhancement to the ultimate limit in silver nanoparticle dimers
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Abstract
Cascaded optical field enhancement in coupled plasmonic nanostructures has attracted significant attention because of field enhancement factors that dramatically exceed those observed in isolated nanostructures. While previous studies demonstrated the existence of cascaded enhancement, little work has been done to identify the requirements for achieving maximum field enhancement. Here, we investigate cascaded field enhancement in silver nanosphere dimers as a function of volume ratio and center-to-center separation, and show the requirements for achieving the ultimate cascading limit in nanoparticle dimers. We observe field enhancements that are a factor 75 larger than observed in isolated silver nanoparticles.
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S. Toroghi, P. G. Kik, "Taking cascaded plasmonic field enhancement to the ultimate limit in silver nanoparticle dimers", Proc. SPIE 8457, Plasmonics: Metallic Nanostructures and Their Optical Properties X, 84570D (9 October 2012); doi: 10.1117/12.930333; https://doi.org/10.1117/12.930333
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