PICOSECOND INDUCED ABSORPTION IN ULTRADIS PERSE AMORPHOUS SELENIUM PARTICLES

Citation
Kv. Yumashev et al., PICOSECOND INDUCED ABSORPTION IN ULTRADIS PERSE AMORPHOUS SELENIUM PARTICLES, Kvantovaa elektronika, 21(9), 1994, pp. 887-890
Citations number
22
Categorie Soggetti
Physics, Applied","Engineering, Eletrical & Electronic
Journal title
ISSN journal
03687147
Volume
21
Issue
9
Year of publication
1994
Pages
887 - 890
Database
ISI
SICI code
0368-7147(1994)21:9<887:PIAIUP>2.0.ZU;2-3
Abstract
A study was made of the induced absorption in amorphous selenium parti cles (average radius approximately 20 nm) embedded in a polymer. A pic osecond pump and probe technique was used. The change in the absorptio n was measured in the spectral range 550-750 nm when the pump radiatio n was in the form of pulses of 15 ps duration and 2.3 eV photon energy . The induced-absorption spectra were attributed to optical exciton-bi exciton transitions. The exciton lifetime was estimated to be 424 +/- 32 ps.