镓反射镜光致反射率变化的纳秒动力学
Nanosecond dynamics of a gallium mirror's light-induced reflectivity change
摘要：
瞬态泵浦-探测光反射率测量的纳米/微秒动态的完全可逆的，光诱导的，表面辅助金属化的镓与二氧化硅接口的报告。金属化导致相当大的增加，在界面的反射率时，固体镓是在熔化的边缘。反射率的变化被认为是一个累积效应，随着光强度和脉冲持续时间的增长。当激发在镓的熔点临界增加的时间内被撤回时，反射率弛豫回到α-镓的反射率。该效应归因于非热光致结构相变。
英文摘要：
Transient pump-probe optical reflectivity measurements of the nano/microsecond dynamics of a fully reversible, light-induced, surface-assisted metallization of gallium interfaced with silica are reported. The metallization leads to a considerable increase in the interface's reflectivity when solid a-gallium is on the verge of melting. The reflectivity change was found to be a cumulative effect that grows with light intensity and pulse duration. The reflectivity relaxes back to that of alpha-gallium when the excitation is withdrawn in a time that increases critically at gallium's melting point. The effect is attributed to a non-thermal light-induced structural phase transition.
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