Abstract

Different silver (Ag) island films were formed by annealing Ag films that were deposited on ${\mathrm{SiO}}_2/\mathrm{Si}$ substrates for different durations. Enhanced fluorescence of $\mathrm{Eu}(\mathrm{TTFA}{)}_3$-doped SU8 films was demonstrated by these island Ag films. The enhancement was much greater than that by the unannealed Ag films and varied with these island films. The relative changes of the radiative and nonradiative transition rates of europium ions were also deduced in presence of $23\mathrm{nm}$ annealed Ag films; the former one could increase to 1.625, the latter one could decrease to 0.505, and the quantum efficiency was enhanced to 1.376.

© 2011 Optical Society of America

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