Optical nonlinearities in VO 2 nanoparticles and thin films

Rene Lopez; Richard F. Haglund; Leonard C. Feldman; Lynn A. Boatner; Tony E. Haynes

doi:10.1063/1.1826232

Optical nonlinearities in VO ₂ nanoparticles and thin films

Rene Lopez, Richard F. Haglund, Leonard C. Feldman, Lynn A. Boatner, Tony E. Haynes

Rutgers University

Research output: Contribution to journal › Article › peer-review

57 Citations (Scopus)

Abstract

Z-scan and pump-probe measurements with ultrafast, 800 nm laser pulses were used to compare the ultrafast optical nonlinearities of VO ₂ nanoparticles and thin films in both semiconducting and metallic states. In the metallic state, both the nanocrystals and thin films exhibit a positive, intensity-dependent nonlinear index of refraction. However, the nonlinear effects are relatively larger in the VO ₂ nanocrystals, which also reveal a saturable nonlinear absorption. When the semiconductor-to-metal phase transition is induced by the laser pulse, VO ₂ thin films exhibit a negative equivalent nonlinear index of refraction while the nanocrystals exhibit a smaller but still positive index. Both the VO ₂ nanocrystals and thin films undergo the phase transition within 120 fs.

Original language	English
Article number	3
Pages (from-to)	5191-5193
Number of pages	3
Journal	Applied Physics Letters
Volume	85
Issue number	22
DOIs	https://doi.org/10.1063/1.1826232
Publication status	Published - Nov 29 2004

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.1826232

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title = "Optical nonlinearities in VO 2 nanoparticles and thin films",

abstract = "Z-scan and pump-probe measurements with ultrafast, 800 nm laser pulses were used to compare the ultrafast optical nonlinearities of VO 2 nanoparticles and thin films in both semiconducting and metallic states. In the metallic state, both the nanocrystals and thin films exhibit a positive, intensity-dependent nonlinear index of refraction. However, the nonlinear effects are relatively larger in the VO 2 nanocrystals, which also reveal a saturable nonlinear absorption. When the semiconductor-to-metal phase transition is induced by the laser pulse, VO 2 thin films exhibit a negative equivalent nonlinear index of refraction while the nanocrystals exhibit a smaller but still positive index. Both the VO 2 nanocrystals and thin films undergo the phase transition within 120 fs.",

author = "Rene Lopez and Haglund, {Richard F.} and Feldman, {Leonard C.} and Boatner, {Lynn A.} and Haynes, {Tony E.}",

note = "Funding Information: This research was sponsored at Vanderbilt University by the National Science Foundation (Grant No. DMR-0210785) and at Oak Ridge National Laboratory (ORNL), by the Laboratory Directed Research and Development program. ORNL is operated by UT-Battelle, LLC for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. ",

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AU - Haglund, Richard F.

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AU - Boatner, Lynn A.

AU - Haynes, Tony E.

N1 - Funding Information: This research was sponsored at Vanderbilt University by the National Science Foundation (Grant No. DMR-0210785) and at Oak Ridge National Laboratory (ORNL), by the Laboratory Directed Research and Development program. ORNL is operated by UT-Battelle, LLC for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725.

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N2 - Z-scan and pump-probe measurements with ultrafast, 800 nm laser pulses were used to compare the ultrafast optical nonlinearities of VO 2 nanoparticles and thin films in both semiconducting and metallic states. In the metallic state, both the nanocrystals and thin films exhibit a positive, intensity-dependent nonlinear index of refraction. However, the nonlinear effects are relatively larger in the VO 2 nanocrystals, which also reveal a saturable nonlinear absorption. When the semiconductor-to-metal phase transition is induced by the laser pulse, VO 2 thin films exhibit a negative equivalent nonlinear index of refraction while the nanocrystals exhibit a smaller but still positive index. Both the VO 2 nanocrystals and thin films undergo the phase transition within 120 fs.

AB - Z-scan and pump-probe measurements with ultrafast, 800 nm laser pulses were used to compare the ultrafast optical nonlinearities of VO 2 nanoparticles and thin films in both semiconducting and metallic states. In the metallic state, both the nanocrystals and thin films exhibit a positive, intensity-dependent nonlinear index of refraction. However, the nonlinear effects are relatively larger in the VO 2 nanocrystals, which also reveal a saturable nonlinear absorption. When the semiconductor-to-metal phase transition is induced by the laser pulse, VO 2 thin films exhibit a negative equivalent nonlinear index of refraction while the nanocrystals exhibit a smaller but still positive index. Both the VO 2 nanocrystals and thin films undergo the phase transition within 120 fs.

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