Hostname: page-component-586b7cd67f-rdxmf Total loading time: 0 Render date: 2024-11-28T11:15:35.891Z Has data issue: false hasContentIssue false
  • English
  • Français

Nonlinear Optical Spectroscopy of Cadmium Chalcogenide Nanocrystals

Published online by Cambridge University Press:  15 February 2011

J.T. Seo ,
Q. Yang ,
S. Creekmore ,
J. Mangana ,
J. Anderson ,
C. Pompey ,
D. Temple ,
X. Peng ,
J. L. Qu  and
W. Yu
...Show all authors
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
Get access

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
Information
MRS Online Proceedings Library (OPL) , Volume 780: Symposium Y – Advanced Optical Processing of Materials , 2003 , Y3.1
Copyright
Copyright © Materials Research Society 2003

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

references

1. Chapple, P.B., Staromlynska, J., Hermann, J.A., McKay, T.J., McDuff, R.G., J. of Nonlinear Optical Physics and Materials, 6(3), 251 (1997).Google Scholar
2. Hashimoto, T., Yamamoto, T., Kato, T., Nasu, H., J. of Appl. Phys. 90(2), 533 (2001).Google Scholar
3. Paula, A., Barbosa, L., Cruz, C., Alves, O., Sanjurjo, J., and Cesar, C., Superlattices and Microstructures, 23(5), 1103 (1998).Google Scholar
4. Gaponenko, S.V., “Optical properties of nanocrystals and their assembles,” Nanoscale Linear and Nonlinear Optics, edited by Bertolotti, M., (American Institute of Physics, 2001) pp. 157–177.Google Scholar