场致发射尖端的Laser诱导超快电子发射
Laser-induced ultrafast electron emission from a field emission tip
摘要：
我们表明，场发射尖端电子源，是由飞秒激光脉冲触发，可以产生电子脉冲短于激光脉冲的持续时间（~100 fs）。发射过程对激光强度的幂律敏感，该幂律支持基于多光子吸收然后过势垒发射的发射机制。所观察到的不同阶次的幂律之间的连续过渡指示场发射过程。我们表明，源也可以操作，使电子发射过程变得显着。了解这些不同的发射过程是相关的子周期电子脉冲的生产。
英文摘要：
We show that a field emission tip electron source that is triggered with a femtosecond laser pulse can generate electron pulses shorter than the laser pulse duration (~100 fs). The emission process is sensitive to a power law of the laser intensity, which supports an emission mechanism based on multiphoton absorption followed by over-the-barrier emission. Observed continuous transitions between power laws of different orders are indicative of field emission processes. We show that the source can also be operated so that thermionic emission processes become significant. Understanding these different emission processes is relevant for the production of sub-cycle electron pulses.
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