Optical nonlinearities in VO 2 nanoparticles and thin films

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

Research output: Contribution to journalArticlepeer-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 languageEnglish
Article number3
Pages (from-to)5191-5193
Number of pages3
JournalApplied Physics Letters
Volume85
Issue number22
DOIs
Publication statusPublished - Nov 29 2004

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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