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2 September 2009 Designing plasmonic systems: applications to dark modes in nanoparticle pairs and triplets
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The design of structures capable of producing strong electric near-fields has become an active area of plasmonics research with applications including sensor technology, surface enhanced Raman scattering and plasmon solar cells. The purposeful design of plasmonic systems is complicated by the problem of finding analytical solutions to Maxwell's equations. Recently we developed a theory, based on a simplification of the boundary element method (BEM), for modeling the interaction between plasmonic nanoparticles mediated by their evanescent electric fields. The theory makes extensive use of "electrostatic" resonances in which the nanoparticle system is taken to be much smaller than the wavelength of the exciting radiation. The key result is an expression describing the "electrostatic" coupling between arbitrarily-shaped particle pairs, expressed in terms of their resonant eigenmodes. Simple analyses of two and three particle systems predict the formation of "dark modes" in which the dipole scattering cross section becomes small but the evanescent electric fields remain large.
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Timothy J. Davis, Kristy C. Vernon, and Daniel E. Gómez "Designing plasmonic systems: applications to dark modes in nanoparticle pairs and triplets", Proc. SPIE 7394, Plasmonics: Metallic Nanostructures and Their Optical Properties VII, 739423 (2 September 2009);

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