META 2021, META'12

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Focusing surface plasmons on Er3+ ions through of gold planar plasmonic lenses
Victor Anthony Garcia Rivera, Fabio Aparecido Ferri, Luiz A.O. Nunes, Euclydes Marega Jr

Last modified: 2012-01-03

Abstract


Gold plasmonic lenses consisting of planar concentric rings with different periods were milled with a Focused gallium Ion Beam on a gold thin film deposited onto an Er3+-doped tellurite glass. The plasmonic lenses were vertically illuminated with an argon ion laser (558 nm) highly focused by means of a 20x objective lens. The focusing mechanism of the plasmonic lenses is explained by using a simple coherent interference model of surface plasmon-polariton (SPP) generation on the circular grating as a result of the incident field. As a result, phase modulation can be accomplished by the groove depth profile, similar to a nano-slit array with different widths. This focusing allows a high confinement of SPPs which excited the Er3+ ions of the substrate. We analyze the influence of physical and geometrical parameters on the luminescence spectra. The variation of these parameters resulted in considerable changes of the luminescence spectra.


Keywords


nanostructures, plasmonic, tellurite glass, Er3+ ions