Quasicontinuous gain in sol-gel derived CdS quantum dots

J. Butty, Y. Z. Hu, Nasser N Peyghambarian, Y. H. Kao, J. D. Mackenzie

Research output: Contribution to journalArticle

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Abstract

We report evidence for quasicontinuous optical gain in CdS quantum dots fabricated by the sol-gel process and embedded in glass. The gain spectra are obtained using the pump and probe technique and nanosecond (quasiresonant) excitation at 11 K. The dots are in the intermediate quantum confinement regime and the concentration of CdS is relatively high. The gain, which is spectrally broad, develops on the low energy side of the absorption band edge. The reason why the gain region is broad is not only the size distribution of the dots, but also the nature of the gain, which originates from the recombination of several excited levels between two and one electron-hole pairs states (i.e., biexciton to exciton). The maximum measured gain reaches 200cm-1 at 11 K and 17cm-1 at 170 K.

Original languageEnglish (US)
Pages (from-to)2672
Number of pages1
JournalApplied Physics Letters
Volume67
StatePublished - 1995

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quantum dots
gels
sol-gel processes
excitons
pumps
absorption spectra
probes
glass
excitation
energy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Butty, J., Hu, Y. Z., Peyghambarian, N. N., Kao, Y. H., & Mackenzie, J. D. (1995). Quasicontinuous gain in sol-gel derived CdS quantum dots. Applied Physics Letters, 67, 2672.

Quasicontinuous gain in sol-gel derived CdS quantum dots. / Butty, J.; Hu, Y. Z.; Peyghambarian, Nasser N; Kao, Y. H.; Mackenzie, J. D.

In: Applied Physics Letters, Vol. 67, 1995, p. 2672.

Research output: Contribution to journalArticle

Butty, J, Hu, YZ, Peyghambarian, NN, Kao, YH & Mackenzie, JD 1995, 'Quasicontinuous gain in sol-gel derived CdS quantum dots', Applied Physics Letters, vol. 67, pp. 2672.
Butty, J. ; Hu, Y. Z. ; Peyghambarian, Nasser N ; Kao, Y. H. ; Mackenzie, J. D. / Quasicontinuous gain in sol-gel derived CdS quantum dots. In: Applied Physics Letters. 1995 ; Vol. 67. pp. 2672.
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