TY - JOUR
T1 - Femtosecond optical nonlinearities under resonant excitation of excitons in CdSe
AU - Sasaki, Fumio
AU - Mishina, Tomobumi
AU - Masumoto, Yasuaki
AU - Fluegel, Brian
AU - Meissner, Kenith
AU - Peyghambarian, Nasser
N1 - Funding Information:
The authors are grateful to Professors H. Fu-jiyasu and A. Ishida and their coworkers at Shizuoka University for the kind guidance of hot wall epitaxy. They wish to acknowledge Mr. S. Koide for the sample preparation. This work was supported by the International Science Research Program #02044021 and the Scientific Research Grant-in-Aid #02952058 from the Ministry of Education, Science and Culture of Japan.
PY - 1992/2/2
Y1 - 1992/2/2
N2 - Femtosecond pump-and-probe spectroscopy was utilized to study the optical nonlinearities of excitons in CdSe. Under resonant excitation of the A-exciton, a 42 meV energy broadening of the B-exciton structure was observed. This broadening is caused by collisions between the A-exciton and the B-exciton. This is a rather unique observation of the scattering process between different kinds of excitons. Analysis indicates that the A-exciton-B-exciton scattering time is 31 fs. This time is well explained by a simple theory. Under resonant excitation of the B-exciton, a fast recovery of the bleaching was observed at the B-exciton. The recovery time of 0.9 ps is explained as the transformation time of B-excitons into A-excitons emitting LO phonons. The observed time constant agrees with the calculated scattering time based on the Fröhlich interaction within an order of magnitude.
AB - Femtosecond pump-and-probe spectroscopy was utilized to study the optical nonlinearities of excitons in CdSe. Under resonant excitation of the A-exciton, a 42 meV energy broadening of the B-exciton structure was observed. This broadening is caused by collisions between the A-exciton and the B-exciton. This is a rather unique observation of the scattering process between different kinds of excitons. Analysis indicates that the A-exciton-B-exciton scattering time is 31 fs. This time is well explained by a simple theory. Under resonant excitation of the B-exciton, a fast recovery of the bleaching was observed at the B-exciton. The recovery time of 0.9 ps is explained as the transformation time of B-excitons into A-excitons emitting LO phonons. The observed time constant agrees with the calculated scattering time based on the Fröhlich interaction within an order of magnitude.
UR - http://www.scopus.com/inward/record.url?scp=0027107515&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0027107515&partnerID=8YFLogxK
U2 - 10.1016/0022-0248(92)90853-B
DO - 10.1016/0022-0248(92)90853-B
M3 - Article
AN - SCOPUS:0027107515
SN - 0022-0248
VL - 117
SP - 768
EP - 772
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
IS - 1-4
ER -