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By using a self-consistent Maxwell-Bloch method, we demonstrate thesimultaneously lasing and spasing behavior in a simple metal grating-filmnanostructure, which can be attributed to spatial hole burning and the gaincompetition of different modes at the band edge and in the plasmonic band gap.We show three modes: one spaser mode in gap with quality factor as high as248.54, one plasmon lasing mode at band edge which emit vertically from thegrating surface, and the other plasmon lasing mode at band edge which issuppressed by the spaser mode. This method may find significant applications incoherent light and surface plasmon sources with low threshold, surface enhancedRaman scattering, solid-state lighting emission, etc.

Simultaneously plasmon lasing and spasing behavior in a silver grating-film geometry