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The amplification of surface plasmon polaritons in planar metallic waveguides via propagation through an
optically pumped dipolar gain medium incorporated into one of the claddings is discussed theoretically and
experimentally. Physically realisable arrangements based on the single-interface and on the thin metal film
are described. Experimental results are given, demonstrating amplification of the long-range surface plasmon-polariton
along a thin metal stripe at near infrared wavelengths using a dye gain medium. Low amplified
spontaneous emission noise into this mode is simultaneously observed.
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Israel De Leon, Pierre Berini, "Amplification of surface plasmons," Proc. SPIE 7937, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XV, 793719 (21 February 2011); https://doi.org/10.1117/12.876233