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 |
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Article number | 3 |
Pages (from-to) | 5191-5193 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 85 |
Issue number | 22 |
DOIs | |
Publication status | Published - Nov 29 2004 |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)