Coexistence of fast photodarkening and slow photobleaching in Ge19As21Se60 thin films
Coexistence of fast photodarkening and slow photobleaching in Ge19As21Se60 thin films
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DOI：
10.1364/oe.20.012416
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发表时间：
2012-05-21
期刊：
影响因子：
3.8
通讯作者：
Adarsh, K. V.
中科院分区：
文献类型：
--
作者：
Khan, Pritam;Barik, A. R.;Adarsh, K. V.
实验证明了Ge_（19）As_（21）Se_（60）薄膜在波长为671 nm的激光照射下，同时存在两种相反的光效应，即快速光暗化（PD）和慢速光漂白（PB）。PD似乎在光照下立即开始开始，并在数十秒内饱和。相比之下，PB是一个较慢的过程，仅在PD饱和后才开始。PD和PB都遵循对时间的拉伸指数依赖性。将整体变化建模为两个贡献的线性和表明，玻璃网络中As和Ge部分的变化对光的响应有效地彼此独立。(C)2012美国光学学会
We experimentally demonstrate the coexistence of two opposite photo-effects, viz. fast photodarkening (PD) and slow photobleaching (PB) in Ge19As21Se60 thin films, when illuminated with a laser of wavelength 671 nm. PD appears to begin instantaneously upon light illumination and saturates in tens of seconds. By comparison, PB is a slower process that starts only after PD has saturated. Both PD and PB follow stretched exponetial dependence on time. Modeling of overall change as a linear sum of two contributions suggests that the changes in As and Ge parts of glass network respond to light effectively indepndent of each other. (C) 2012 Optical Society of America