α-(Yb_1-xEr_x)_2Si_2O_7 thin films on Si substrates were synthesized by magnetron co-sputtering. The optical emission from Er^3+ ions has been extensively investigated, evidencing the very efficient role of Yb-Er coupling. The energy-transfer coefficient was evaluated for an extended range of Er content (between 0.2 and 16.5 at.%) reaching a maximum value of 2 × 10^−16 cm^−3s^−1. The highest photoluminescence emission at 1535 nm is obtained as a result of the best compromise between the number of Yb donors (16.4 at.%) and Er acceptors (1.6 at.%), for which a high population of the first excited state is reached. These results are very promising for the realization of 1.54 μm optical amplifiers on a Si platform.
Optical Society of America
10 Oct 2011
Volume: 19 Issue: 21 Pages: 20761-20772