Abstract
We have analyzed the effect of linear chains of metallic Ag nanoparticles on the optical properties of a periodically poled Yb3+-Er3+ co-doped LiNbO3 crystal. By exploiting the broad plasmonic response supported by linear chains of strongly coupled Ag nanoparticles, we demonstrate a 50% of enhancement of the up-converted Er3+ emission under excitation in the f-f transition of Yb3+ ions. The observed intensification is explained in terms of the broad plasmonic spectral response supported by the Ag chains, which overlaps both the Er3+ visible emissions and the Yb3+ absorption band, and the two-photon character of the Yb3+ → Er3+ energy-transfer up-conversion process. The results are of interest for applications involving luminescence up-conversion such as sensing, solar energy conversion, biological imaging or solid-state nanolasers.
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