Development and Application of Surface Plasmon Polaritons on Optical Amplification
Figure 4
(a) Cross-sectional view of active structure. The gain medium is in the form of a laser dye in solution. Inset: coordinate system with the z-direction coming out of the page. (b) Pump and probe signal coupling arrangements used for amplification experiments. Pump polarization, indicated by the red arrow, is parallel to the waveguide length (z-axis). A probe signal is coupled in and out of the structure by means of end-fire coupling using polarization-maintaining (PM) fibers. (c) Measurements of amplifier gain versus amplifier length. A linear fit to the unsaturated data yields an LRSPP mode power gain of dB cm−1.
