Abstract

Dichroic Er3+:Au-antimony glass nanocomposites are synthesized in a new reducing glass (dielectric) matrix (mol%) K2OB2O3Sb2O3 (KBS) by a single-step melt-quench technique involving selective thermochemical reduction principle. Transmission electron microscopic images reveal hexagonal Auo nanoparticles having major axes about 923nm. Dichroic behavior arises due to hexagonal Auo nanoparticles of aspect ratio 1.2–1.3. Auo nanoparticles of concentration of 0.03wt% (4.1×1018  atomscm3) drastically enhances the intensity (2–5 folds) of both 536 (S324I1524, green) and 645 (F924I1524, red) nm emission bands of Er3+. Local field enhancement induced by Auo surface plasmon resonance (SPR) and energy transfer from fluorescent AuoEr3+ ions are found to be responsible for enhancement while, at very high Au concentration, energy transfer from Er3+Auo and optical reabsorption due to Auo SPR result in quenching.

© 2009 Optical Society of America

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