Measurement of the velocity of current filaments in optically triggered, high gain GaAs switches
Measurement of the velocity of current filaments in optically triggered, high gain GaAs switches
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DOI：
10.1063/1.111266
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发表时间：
1994-06
影响因子：
4
通讯作者：
G. Loubriel;F. Zutavern;H. Hjalmarson;R. R. Gallegos-R.;W. Helgeson;M. O’Malley
中科院分区：
文献类型：
--
作者：
G. Loubriel;F. Zutavern;H. Hjalmarson;R. R. Gallegos-R.;W. Helgeson;M. O’Malley
图片的时间演变过程中的光触发，高增益开关在GaAs中的电流丝。用两个激光二极管阵列触发两个灯丝，并且它们之间的时间延迟是变化的。当第一个被触发的灯丝穿过开关时，电压下降，另一个灯丝停止生长。通过改变激光器之间的延迟，测得尖端速度为2±1×109 cm/s，比GaAs中载流子的峰值漂移速度大100倍。这一观察结果支持开关模型，依赖于在灯丝的尖端产生的载流子。
Pictures are presented of the time evolution of current filaments during optically triggered, high gain switching in GaAs. Two filaments are triggered with two laser diode arrays and the time delay between them is varied. When the filament that is triggered first crosses the switch the voltage drops and the other filament ceases to grow. By varying the delay between the lasers, the tip velocity is measured to be 2±1×109 cm/s, 100 times larger than the peak drift velocity of carriers in GaAs. This observation supports switching models that rely on carrier generation at the tip of the filament.