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- Title
Focusing surface plasmons on Er ions through gold planar plasmonic lenses.
- Authors
Rivera, V.; Ferri, F.; Nunes, L.; Zanatta, A.; Marega, E.
- 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 Er-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 Er ions of the glass. The Er 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 Er 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.
- Subjects
SURFACE plasmon resonance; ERBIUM; ION bombardment; OPTICAL properties of metals; LENSES; LUMINESCENCE spectroscopy; GOLD; WAVELENGTHS
- Publication
Applied Physics A: Materials Science & Processing, 2012, Vol 109, Issue 4, p1037
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-012-7374-8