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Nonlinear Optical Dynamics During Phase Transition in Vanadium Dioxide

Published online by Cambridge University Press:  01 February 2011

Sergiy Lysenko ,
Guangjun Zhang ,
Valentin Vikhnin ,
Armando Rua ,
Felix Fernandez  and
Huimin Liu
Sergiy Lysenko
Affiliation:
[email protected], University of Puerto Rico, Department of Physics, University of Puerto Rico, Mayaguez, Puerto Rico, 00681-9016, United States Minor Outlying Islands
Guangjun Zhang
Affiliation:
[email protected], University of Puerto Rico, Department of Physics, Puerto Rico
Valentin Vikhnin
Affiliation:
[email protected], University of Puerto Rico, Department of Physics, Puerto Rico
Armando Rua
Affiliation:
[email protected], University of Puerto Rico, Department of Physics, Puerto Rico
Felix Fernandez
Affiliation:
[email protected], University of Puerto Rico, Department of Physics, Puerto Rico
Huimin Liu
Affiliation:
[email protected], University of Puerto Rico, Department of Physics, Puerto Rico
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Abstract

Insulator-to-metal phase transition (PT) and relaxation dynamics in VO2 were studied with ultrafast transient reflection spectroscopy and degenerate four wave mixing technique. Optical pumping of free carriers in VO2 initiates PT on a femtosecond time scale. The relaxation dynamics is strongly dependent on pump energy. Spectral reflectivity behaviour at PT due to thermal heating and upon laser excitation of VO2 demonstrates close proximity in the relative change. PT induced by light was interpreted by exciton-controlled mechanism. Excited state dynamics of metallic VO2 is assigned to formations of electronic and hole polaronic states.

Keywords

metal-insulator transitionoxideoptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 888: Symposium V – Materials and Devices for Smart Systems II , 2005 , 0888-V05-02
Copyright
Copyright © Materials Research Society 2006

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References

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