Preparation and non-linear optical properties of CdS quantum dots in Na2O-B2O3-SiO2 glasses by the sol-gel technique

T. Takada, J. D. Mackenzie, M. Yamane, K. Kang, Nasser N Peyghambarian, R. J. Reeves, E. T. Knobbe, R. C. Powell

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Abstract

Non-linear optical properties of CdS quantum dots embedded in the sol-gel derived Na2O-B2O3-SiO2 glass matrix have been studied using nanosecond degenerate four-wave mixing (DFWM), pump-probe experiments, and time-resolved subpicosecond DFWM measurements. The concentration of CdS microcrystallites was varied from 1.4 to 10.2 wt% while the particle size was controlled to be in the range of 36 nm in diameter so that the confinement effects can be realized. The third-order susceptibility, χ(3), was determined to be of the order of 10-7-10-6 e.s.u. near the resonant wavelength between 450 and 470 nm by the nanosecond DFWM and pump-probe experiments, and of the order of 10-11-10-10 e.s.u. at the off-resonant wavelength, 580 nm, by a time-resolved DFWM measurement with 400 fs laser pulse. The decay time changed from 0.5 to 50 picoseconds as a function of the size, size distribution and number density of CdS microcrystallites in the glasses. Photodarkerting reduced the optical non-linearity of the melt-quenched samples by a factor of ≈ 20, while it had no appreciable effect on that of the sol-gel derived samples.

Original languageEnglish (US)
Pages (from-to)423-430
Number of pages8
JournalJournal of Materials Science
Volume31
Issue number2
Publication statusPublished - 1996

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ASJC Scopus subject areas

  • Materials Science(all)

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Takada, T., Mackenzie, J. D., Yamane, M., Kang, K., Peyghambarian, N. N., Reeves, R. J., ... Powell, R. C. (1996). Preparation and non-linear optical properties of CdS quantum dots in Na2O-B2O3-SiO2 glasses by the sol-gel technique. Journal of Materials Science, 31(2), 423-430.