spaser

Etymology
Acronym for "surface plasmon amplification by stimulated emission of radiation"; compare. The phenomenon was first described by Bergman and Stockman in 2003, and the first such device was announced in 2009.

Noun

 * 1)  The nanoplasmonic counterpart of a laser; a nanoscale source of optical fields with potential uses in nanoscale lithography, probing and microscopy.