18 May 2011 Passive and active plasmonic nanoarray devices
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Metal nanoparticle arrays offer the possibility to considerably surpass the optical field confinement of silicon waveguides. The properties of directional couplers composed of such plasmonic nanoarrays are analyzed theoretically, while neglecting material losses. It is found that it is possible to generate very compact, submicron length, high fieldconfinement and functionality devices with very low switch energies. We further perform a study of spatial losses in Ag nanoparticle arrays by obtaining the group velocity and the lifetime of the surface plasmon polaritons. The losses are determined for different host permittivities, polarizations, and for spherical and spheroidal particles, with a minimum loss of 12 dB/μm. The possibilities to compensate the losses using gain materials, and the added noise associated with that, is briefly discussed.
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Petter Holmström, Petter Holmström, Jun Yuan, Jun Yuan, Min Qiu, Min Qiu, Lars Thylén, Lars Thylén, Alexander M. Bratkovsky, Alexander M. Bratkovsky, "Passive and active plasmonic nanoarray devices", Proc. SPIE 8070, Metamaterials VI, 80700T (18 May 2011); doi: 10.1117/12.890978; https://doi.org/10.1117/12.890978

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