Focusing surface plasmons on Er3+ ions through gold planar plasmonic lenses

V. A.G. Rivera, F. A. Ferri, L. A.O. Nunes, A. R. Zanatta, E. Marega

Research output: Contribution to journalArticlepeer-review

Abstract

Gold plasmonic lenses consisting of a planar concentric rings-groove 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 highly focused by means of a 50× objective lens. The focusing mechanism of the plasmonic lenses is explained using a coherent interference model of surface plasmon-polariton (SPP) generation on the circular grating due to the incident field. As a result, phase modulation can be accomplished by the groove gap, similar to a nanoslit array with different widths. This focusing allows a high confinement of SPPs that can excite the Er3+ ions of the glass. The Er3+ luminescence spectra were measured in the far-field (500-750 nm wavelength range), where we could verify the excitation yield via the plasmonic lens on the Er3+ ions. We analyze the influence of the geometrical parameters on the luminescence spectra. The variation of these parameters results in considerable changes of the luminescence spectra.

Original languageEnglish
Pages (from-to)1037-1041
Number of pages5
JournalApplied Physics A: Materials Science and Processing
Volume109
Issue number4
DOIs
StatePublished - Dec 2012

Bibliographical note

Funding Information:
This work was financially supported by the Brazilian agencies FAPESP and CNPq under CEPOF/INOF (Instituto Nacional de Óptica e Fotônica).

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