Ultrafast optical nonlinearities in II-VI compounds

B. Fluegel, M. Joffre, S. H. Park, R. Morgan, Y. Z. Hu, M. Lindberg, Stephan W Koch, D. Hulin, A. Migus, A. Antonetti, Nasser N Peyghambarian

Research output: Contribution to journalArticle

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Abstract

We review our experimental and theoretical results on the femtosecond laser excited CdS and CdSe bulk and quantum dots. Optical Stark effect in bulk CdS is reported where the electron-hole continuum states in addition to the bound-exciton states are blue shifted. The nonlinear optical properties of CdSe microcrystallites embedded in glass matrices are investigated using femtosecond and nanosecond laser pulses. Spectral hole-buring is observed which is accompanied by an induced absorption feature on the high-energy side. A 25±10 fs dephasing time is obtained from these measurements. It is concluded that Coulomb effects are important in quantum dots. They give rise to a ground state two-pair resonance on the low energy side of the one-pair state and higher energy two-pair resonances which are spectrally located between the one-pair states. Single-beam saturation experiments show that the intensities required for bleaching are larger for smaller crystallites.

Original languageEnglish (US)
Pages (from-to)643-649
Number of pages7
JournalJournal of Crystal Growth
Volume101
Issue number1-4
DOIs
StatePublished - Apr 1 1990

Fingerprint

Semiconductor quantum dots
nonlinearity
Stark effect
Bleaching
Ultrashort pulses
Crystallites
quantum dots
Excitons
Ground state
Laser pulses
Optical properties
bleaching
Glass
crystallites
lasers
energy
Electrons
excitons
continuums
saturation

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Fluegel, B., Joffre, M., Park, S. H., Morgan, R., Hu, Y. Z., Lindberg, M., ... Peyghambarian, N. N. (1990). Ultrafast optical nonlinearities in II-VI compounds. Journal of Crystal Growth, 101(1-4), 643-649. https://doi.org/10.1016/0022-0248(90)91052-R

Ultrafast optical nonlinearities in II-VI compounds. / Fluegel, B.; Joffre, M.; Park, S. H.; Morgan, R.; Hu, Y. Z.; Lindberg, M.; Koch, Stephan W; Hulin, D.; Migus, A.; Antonetti, A.; Peyghambarian, Nasser N.

In: Journal of Crystal Growth, Vol. 101, No. 1-4, 01.04.1990, p. 643-649.

Research output: Contribution to journalArticle

Fluegel, B, Joffre, M, Park, SH, Morgan, R, Hu, YZ, Lindberg, M, Koch, SW, Hulin, D, Migus, A, Antonetti, A & Peyghambarian, NN 1990, 'Ultrafast optical nonlinearities in II-VI compounds', Journal of Crystal Growth, vol. 101, no. 1-4, pp. 643-649. https://doi.org/10.1016/0022-0248(90)91052-R
Fluegel B, Joffre M, Park SH, Morgan R, Hu YZ, Lindberg M et al. Ultrafast optical nonlinearities in II-VI compounds. Journal of Crystal Growth. 1990 Apr 1;101(1-4):643-649. https://doi.org/10.1016/0022-0248(90)91052-R
Fluegel, B. ; Joffre, M. ; Park, S. H. ; Morgan, R. ; Hu, Y. Z. ; Lindberg, M. ; Koch, Stephan W ; Hulin, D. ; Migus, A. ; Antonetti, A. ; Peyghambarian, Nasser N. / Ultrafast optical nonlinearities in II-VI compounds. In: Journal of Crystal Growth. 1990 ; Vol. 101, No. 1-4. pp. 643-649.
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N2 - We review our experimental and theoretical results on the femtosecond laser excited CdS and CdSe bulk and quantum dots. Optical Stark effect in bulk CdS is reported where the electron-hole continuum states in addition to the bound-exciton states are blue shifted. The nonlinear optical properties of CdSe microcrystallites embedded in glass matrices are investigated using femtosecond and nanosecond laser pulses. Spectral hole-buring is observed which is accompanied by an induced absorption feature on the high-energy side. A 25±10 fs dephasing time is obtained from these measurements. It is concluded that Coulomb effects are important in quantum dots. They give rise to a ground state two-pair resonance on the low energy side of the one-pair state and higher energy two-pair resonances which are spectrally located between the one-pair states. Single-beam saturation experiments show that the intensities required for bleaching are larger for smaller crystallites.

AB - We review our experimental and theoretical results on the femtosecond laser excited CdS and CdSe bulk and quantum dots. Optical Stark effect in bulk CdS is reported where the electron-hole continuum states in addition to the bound-exciton states are blue shifted. The nonlinear optical properties of CdSe microcrystallites embedded in glass matrices are investigated using femtosecond and nanosecond laser pulses. Spectral hole-buring is observed which is accompanied by an induced absorption feature on the high-energy side. A 25±10 fs dephasing time is obtained from these measurements. It is concluded that Coulomb effects are important in quantum dots. They give rise to a ground state two-pair resonance on the low energy side of the one-pair state and higher energy two-pair resonances which are spectrally located between the one-pair states. Single-beam saturation experiments show that the intensities required for bleaching are larger for smaller crystallites.

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