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Article Dans Une Revue Optics Express Année : 2017

Selective excitation of surface plasmon modes propagating in Ag nanowires

Résumé

Surface plasmon modes propagating in metal nanowires are conveniently excited by focusing a laser beam on one extremity of the nanowire. We find that the precise positioning of the nanowire inside the focal region drastically influences the excitation efficiency of the different SPP modes sustained by the plasmonic waveguide. We demonstrate a spatially selective excitation of bound and leaky surface plasmon modes with excitation maps that strongly depend on the orientation of the incident linear polarization. We discuss this modal selection by considering the inhomogeneous distribution of the field components inside the focus. Our finding provides a way to discriminate the effective indices of the modes offering thus an increased coupling agility for future nanowire-based plasmonic architectures.

Dates et versions

hal-01712118 , version 1 (19-02-2018)

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Mingxia Song, Jean Dellinger, Olivier Demichel, Mickaël Buret, Gérard Colas Des Francs, et al.. Selective excitation of surface plasmon modes propagating in Ag nanowires. Optics Express, 2017, 25 (8), pp.9138-9149. ⟨10.1364/OE.25.009138⟩. ⟨hal-01712118⟩
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