Abstract
Abstract Surface plasmons offer useful properties such as field localization and enhancement, high surface sensitivity, and sub-wavelength confinement, which have led surface plasmons into applications in, e.g. , nanophotonics, biosensing, and integrated optical circuits. However, attenuation limits the surface plasmon propagation length, as these waves dissipate their energy primarily by absorption in the metal. Surface plasmon amplification is produced by introducing optical gain into the dielectric(s) through which these waves propagate. Surface plasmon amplifiers are envisaged as stand-alone components or as gain sections integrated with other plasmonic functions to compensate losses and improve performance. Combining amplification with feedback leads to surface plasmon oscillators (lasers or spasers), which are of interest as sources of surface plasmons. This chapter reviews recent work conducted on surface plasmon amplification and lasing.
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