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Journal Articles Optics Express Year : 2013

Metallic nanoparticle chains on dielectric waveguides: coupled and uncoupled situations compared

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Abstract

We investigate the optical behaviors of metallic nanoparticle (MNP) chains supporting localized surface plasmon (LSP) for different distances between particles. MNPs are excited through the fundamental TE mode of a silicon waveguide. Finite difference time domain (FDTD) calculations and optical power transmission measurements reveal three different behaviors. For short distances between particles, dipolar coupling occurs, and the MNP chain behaves as a waveguide. For the longest distances, nanoparticles are uncoupled, and the MNP chain acts as a LSP Bragg grating. Finally, for intermediate distances, we observe one behavior at a time, i.e. dipolar coupling or LSP Bragg reflection. There is only a small range of wavelengths within which both behaviors can coexist.

Dates and versions

hal-02383145 , version 1 (27-11-2019)

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Mickael Fevrier, Philippe Gogol, Jean-Michel Lourtioz, Béatrice Dagens. Metallic nanoparticle chains on dielectric waveguides: coupled and uncoupled situations compared. Optics Express, 2013, 21 (21), pp.24504. ⟨10.1364/OE.21.024504⟩. ⟨hal-02383145⟩

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