Journal
APPLIED PHYSICS LETTERS
Volume 80, Issue 1, Pages 121-123Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1428622
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We report laser oscillation at similar to 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. (C) 2002 American Institute of Physics.
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