Development and Application of Surface Plasmon Polaritons on Optical Amplification
Figure 9
(a) Schematic depiction of the measurement geometry. The sample is illuminated with 1480 nm pump light, and upconversion luminescence from Er ions implanted in the sapphire substrate is collected through the substrate. (b) Er3+ 4f level diagram indicating the upconversion mechanism that leads to the population of Er3+ levels emitting at wavelengths of 980, 660, and 550 nm under 1480 nm excitation.
