Quantum size effects on the third order optical nonlinearity of CdS quantum dots in Nafion

Optical nonlinearities of CdS quantum dots in the strongly confined regime are probed through degenerate four-wave-mixing experiments in an attempt to study the size dependence of the third order optical susceptibility χ (3). The results indicate that χ (3) is strongly dependent on the diameter of t...

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Bibliographic Details
Published in:Optics communications 2000-11, Vol.185 (4), p.457-465
Main Authors: Nandakumar, P., Vijayan, C., Murti, Y.V.G.S.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Nonlinear optics
Optical materials
Optical phase conjugation
Optical susceptibility, hyperpolarizability
Optics
Other nonlinear optical materials
photorefractive and semiconductor materials
Phase conjugation, optical mixing, and photorefractive effect
Phase conjugation, optical mixing
photorefractive and kerr effects
Physics
Semiconductor quantum dots
Third order susceptibility
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Summary:Optical nonlinearities of CdS quantum dots in the strongly confined regime are probed through degenerate four-wave-mixing experiments in an attempt to study the size dependence of the third order optical susceptibility χ (3). The results indicate that χ (3) is strongly dependent on the diameter of the dots and that there is a large increase in χ (3) values as the diameter decreases below 2 nm. Polarization discrimination studies point to nonthermal contributions to the mechanism of optical nonlinearity.
ISSN:0030-4018
1873-0310
DOI:10.1016/S0030-4018(00)01009-9