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11 September 2013 Cascaded plasmon resonances multi-material nanoparticle trimers for extreme field enhancement
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Optical field enhancement in coupled plasmonic nanostructures has attracted significant attention because of field enhancement factors that significantly exceed those observed in isolated nanostructures. While previous studies demonstrated the existence of such cascaded field enhancement in coupled nanospheres with identical composition, this effect has not yet been studied in systems containing multiple materials. Here, we investigate the polarization-dependent optical response of multi-material trimer nanostructures composed of Au nanoparticles surrounded by two Ag nanoparticles as a function of nanoparticle size and inter-particle spacing. We observe field enhancement factors that are ten times larger than observed in isolated Au nanoparticles.
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S. Toroghi, Chatdanai Lumdee, and Pieter G. Kik "Cascaded plasmon resonances multi-material nanoparticle trimers for extreme field enhancement", Proc. SPIE 8809, Plasmonics: Metallic Nanostructures and Their Optical Properties XI, 88091M (11 September 2013);

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