Observation of laser oscillation in aggregates of ultrasmall silicon nanoparticles

Nayfeh, M. H.; Rao, S.; Barry, N.; Therrien, J.; Belomoin, G.; Smith, A.; Chaieb, S.
January 2002
Applied Physics Letters;1/7/2002, Vol. 80 Issue 1, p121
Academic Journal
We report laser oscillation at ∼610 nm in aggregates of ultrasmall elemental Si nanoparticles. The particles are ultrabright red emitting, dispersed from bulk Si by electrochemistry. The aggregates are excited by radiation at 550-570 nm from a mercury lamp. Intense directed Gaussian beams, with a threshold, manifest the emission. We observe line narrowing, and speckle patterns, indicating spatial coherence. This microlasing constitutes an important step towards the realization of a laser on a chip, hence optoelectronics integration and optical interconnects.


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