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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 12 — Nov. 10, 2009

Two-photon absorption of quantum dots in the regime of very strong confinement: size and wavelength dependence

Yingli Qu and Wei Ji  »View Author Affiliations

JOSA B, Vol. 26, Issue 10, pp. 1897-1904 (2009)

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The frequency-degenerate two-photon absorption (TPA) in glutathione-capped colloidal CdTe quantum dots with a dot radius ranging from 1.5 to 2 nm, which belongs to the regime of very strong quantum confinement, is determined unambiguously by utilizing the Z-scan technique with femtosecond laser pulses. At laser wavelengths between 720 and 950 nm, the TPA cross sections are measured to be of the order of 10 47 10 46 cm 4   s   photon 1 , with precise values depending on both the laser wavelength and the dot size. The TPA measurements are in agreement with theoretical modeling based on a spherical eight-band Pidgen and Brown model. The quantitative modeling reveals underlying factors that contribute to both the TPA–size relationship and size dispersion effects.

© 2009 Optical Society of America

OCIS Codes
(190.4180) Nonlinear optics : Multiphoton processes
(190.4720) Nonlinear optics : Optical nonlinearities of condensed matter
(270.4180) Quantum optics : Multiphoton processes
(160.4236) Materials : Nanomaterials

ToC Category:
Nonlinear Optics

Original Manuscript: May 1, 2009
Revised Manuscript: July 30, 2009
Manuscript Accepted: August 11, 2009
Published: September 15, 2009

Virtual Issues
Vol. 4, Iss. 12 Virtual Journal for Biomedical Optics

Yingli Qu and Wei Ji, "Two-photon absorption of quantum dots in the regime of very strong confinement: size and wavelength dependence," J. Opt. Soc. Am. B 26, 1897-1904 (2009)

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