Abstract:We show the annealing effect on silver and Erbium-doped tellurite glasses in the formation of nanoparticles (NPs) of silver, produced by the reduction of silver (Ag + Ag 0 ), aiming to an fluorescence enhancement. The absorption spectra show typical Localized Surface Plasmon Resonance (LSPR) band of Ag 0 NP in addition to the distinctive absorption peaks of Er 3+ ions. Both observations demonstrate that the photoluminescence enhancement is due to the coupling of dipoles formed by NPs with the Er 3+ 4 I 13/2 4 I 15/2 transition. This plasmon energy transfer to the Er 3+ ions was observed in the fluorescence spectrum with a blue-shift of the peaks. determination of the size dependence of surface plasmon resonance damping in single Ag@SiO( 2 ) nanoparticles," Nano Lett. 9(10), 3463-3469 (2009
We report a systematic study of the localized surface plasmon resonance effects on the photoluminescence of Er 3 + -doped tellurite glasses containing Silver or Gold nanoparticles. The Silver and Gold nanoparticles are obtained by means of reduction of Ag ions (Ag + → Ag 0 ) or Au ions (Au 3 + → Au 0 ) during the melting process followed by the formation of nanoparticles by heat treatment of the glasses. Absorption and photoluminescence spectra reveal particular features of the interaction between the metallic nanoparticles and Er 3 + ions. The photoluminescence enhancement observed is due to dipole coupling of Silver nanoparticles with the 4 I 13/2 → 4 I 15/2 Er 3 + transition and Gold nanoparticles with the 2 H 11/2 → 4 I 13/2 (805 nm) and 4 S 3/2 → 4 I 13/2 (840 nm) Er 3 + transitions. Such process is achieved via an efficient coupling yielding an energy transfer from the nanoparticles to the Er 3 + ions, which is confirmed from the theoretical spectra calculated through the decay rate.Crown
Silver and gold films with thicknesses in the range of 120-450 nm were evaporated onto glass substrates. A sequence of slits with widths varying between 70 and 270 nm was milled in the films using a focused gallium ion beam. We have undertaken high-resolution measurements of the optical transmission through the single slits with 488:0 nm (for Ag) and 632:8 nm (for Au) laser sources aligned to the optical axis of a microscope. Based on the present experimental results, it was possible to observe that (1) the slit transmission is notably affected by the film thickness, which presents a damped oscillatory behavior as the thickness is augmented, and (2) the transmission increases linearly with increasing slit width for a fixed film thickness.
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