Title

Two-photon absorption in CdTe quantum dots

Authors

Authors

L. A. Padilha; J. Fu; D. J. Hagan; E. W. Van Stryland; C. L. Cesar; L. C. Barbosa;C. H. B. Cruz

Comments

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Abbreviated Journal Title

Opt. Express

Keywords

NONLINEAR-OPTICAL PROPERTIES; DOPED GLASSES; SPECTROSCOPY; LIGHT; Optics

Abstract

We report measurements of frequency degenerate and nondegenerate two-photon absorption (2PA) spectra of CdTe quantum dots, QDs, in glass matrices and compare them with 2PA in bulk CdTe. We find that the 2PA is strongly dependent on the size of the QDs becoming smaller with decreasing size, even when normalizing to the volume of the dots. We adapt a simple degenerate 2PA model, based on the effective mass approximation, to nondegenerate 2PA, and this model correctly describes the experimental data for 2-photon energies up to similar to 1.4Eg. This suggests that, once the spectrum for one size of quantum dot is known, the model can be used for predicting the degenerate and nondegenerate 2PA spectra of different sized QDs of the same semiconductor. (c) 2005 Optical Society of America.

Journal Title

Optics Express

Volume

13

Issue/Number

17

Publication Date

1-1-2005

Document Type

Article

Language

English

First Page

6460

Last Page

6467

WOS Identifier

WOS:000231375000016

ISSN

1094-4087

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