Femtosecond optical nonlinearities under resonant excitation of excitons in CdSe

Fumio Sasaki, Tomobumi Mishina, Yasuaki Masumoto, Brian Fluegel, Kenith Meissner, Nasser N Peyghambarian

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Pages (from-to)768-772
Number of pages5
JournalJournal of Crystal Growth
Volume117
Issue number1-4
DOIs
StatePublished - Feb 2 1992

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Excitons
nonlinearity
excitons
excitation
Scattering
LDS 751
recovery
scattering
Recovery
bleaching
Phonons
Bleaching
time constant
phonons
Pumps
Spectroscopy
pumps
collisions
probes

ASJC Scopus subject areas

  • Condensed Matter Physics

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Femtosecond optical nonlinearities under resonant excitation of excitons in CdSe. / Sasaki, Fumio; Mishina, Tomobumi; Masumoto, Yasuaki; Fluegel, Brian; Meissner, Kenith; Peyghambarian, Nasser N.

In: Journal of Crystal Growth, Vol. 117, No. 1-4, 02.02.1992, p. 768-772.

Research output: Contribution to journalArticle

Sasaki, Fumio ; Mishina, Tomobumi ; Masumoto, Yasuaki ; Fluegel, Brian ; Meissner, Kenith ; Peyghambarian, Nasser N. / Femtosecond optical nonlinearities under resonant excitation of excitons in CdSe. In: Journal of Crystal Growth. 1992 ; Vol. 117, No. 1-4. pp. 768-772.
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abstract = "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 Fr{\"o}hlich interaction within an order of magnitude.",
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AU - Sasaki, Fumio

AU - Mishina, Tomobumi

AU - Masumoto, Yasuaki

AU - Fluegel, Brian

AU - Meissner, Kenith

AU - Peyghambarian, Nasser N

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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.

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