FEMTOSECOND LASER EXCITATION OF THE SEMICONDUCTOR-METAL PHASE-TRANSITION IN VO2

被引:218
|
作者
BECKER, MF [1 ]
BUCKMAN, AB [1 ]
WALSER, RM [1 ]
LEPINE, T [1 ]
GEORGES, P [1 ]
BRUN, A [1 ]
机构
[1] UNIV PARIS 11,OPT THEOR & APPL LAB,CNRS,URA 14,F-91403 ORSAY,FRANCE
关键词
D O I
10.1063/1.112974
中图分类号
O59 [应用物理学];
学科分类号
摘要
We have measured the subpicosecond optical response of a solid-state, semiconductor-to-metal phase transition excited by femtosecond laser pulses. We have determined the dynamic response of the complex refractive index of VO2 thin films by making pump-probe optical transmission and reflection measurements at 780 nm. The phase transition was found to be largely prompt with the optical properties of the high-temperature metallic state being attained within 5 ps. The ultrafast change in complex refractive index enables ultrafast optical switching devices in VO2.
引用
收藏
页码:1507 / 1509
页数:3
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