Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1486107 | Journal of Non-Crystalline Solids | 2006 | 6 Pages |
Abstract
We search for the presence of stimulated emission in samples of porous silicon embedded in the sol-gel derived SiO2 matrix. By modifying the etching conditions of the porous silicon using hydrogen peroxide, we decrease substantially the nanocrystal size and produce a significant blue shift of the PL emission. Femtosecond variable-stripe length experiments combined with the shifting-excited spot technique demonstrates positive optical gain (modal gain â¼25Â cmâ1) in the range 550-730Â nm. Ultrafast photoluminescence dynamics indicates the origin of the stimulated emission as possibly due to recombination of excitonic states inside silicon nanocrystals.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
K. Luterová, K. Dohnalová, F. Trojánek, K. Neudert, P. Gilliot, B. Honerlage, P. Malý, I. Pelant,