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Nonlinear Optical Spectroscopy of Cadmium Chalcogenide Nanocrystals

Published online by Cambridge University Press:  15 February 2011

J.T. Seo
Affiliation:
Department of Physics, Hampton University, Hampton, VA 23668
Q. Yang
Affiliation:
Department of Physics, Hampton University, Hampton, VA 23668
S. Creekmore
Affiliation:
Department of Physics, Hampton University, Hampton, VA 23668
J. Mangana
Affiliation:
Department of Physics, Hampton University, Hampton, VA 23668
J. Anderson
Affiliation:
Department of Physics, Hampton University, Hampton, VA 23668
C. Pompey
Affiliation:
Department of Physics, Hampton University, Hampton, VA 23668
D. Temple
Affiliation:
Department of Physics, Hampton University, Hampton, VA 23668
X. Peng
Affiliation:
Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR 72701
J. L. Qu
Affiliation:
Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR 72701
W. Yu
Affiliation:
Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR 72701
A. Wang
Affiliation:
Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR 72701
S. Jung
Affiliation:
Korea Research Institute of Standards and Science, Daejeon, South Korea, 305-600
H. Ruh
Affiliation:
Korea Research Institute of Standards and Science, Daejeon, South Korea, 305-600
A. Mott
Affiliation:
US Army Research Laboratory, 2800 Powder Mill Road, Adelphi, MD 20783
M. Namkung
Affiliation:
NES Branch, NASA Langley Research Center, Hampton, VA 23681
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Abstract

We report on the nonlinear optical properties of cadmium telluride (CdTe) semiconductor colloidal quantum dots. Transmission electron microscopy measurements revealed that the size of CdTe nanocrystal quantum dots, dependent on the growth reaction time, was ∼2-10 nm or near the exciton Bohr radius. The strong blue-shifts of the CdTe, CdSe and CdS nanocrystal absorption spectra and the atomic-like discrete energy states of exciton indicate an exciton quantum confinement. These are completely different optical properties from the bulk crystals. The energy transition for exciton absorption was assigned as h1→e+, h2→e+, h1+→e-, and h2+→e- for the 1st, 2nd, 3rd and 4th exciton absorption peaks. Z-scan and I-scan nonlinear spectroscopy revealed that the CdTe nanocrystal quantum dot in toluene (∼8 × 10-5 mol/L) has the negative nonlinearity (self-defocusing) with ∼ -1 × 10-13 m2/W and a high nonlinear figure of merit of ∼200. For the optical power self-limiting experiment, the CdTe nanocrystal was almost opaque above ∼0.8 MW/cm2 at the position of z∼6.9 cm.

Type
Research Article
Copyright
Copyright © Materials Research Society 2003

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References

references

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