纳米针尖强场光电流中空间电荷效应的起始
Onset of space-charge effects in strong-field photocurrents from nanometric needle tips
摘要：
纳米结构的强场光电子效应及其产生的时间调制电流在超快真空光电子学的发展中起着关键作用。光学光场可以将它们的工作带宽推到拍赫兹域。它们在应用中的功能的一个关键方面是电荷相互作用的作用，包括空间电荷效应。在这里，我们研究了纳米钨针尖暴露于载波包络相位控制的几个周期的激光场的光电发射和光电流。我们报告了一个特征的逐步增加的强度重新缩放的截止能量的发射电子超过一定的强度值。通过与模拟比较，我们确定这一功能的发病的电荷相互作用占主导地位的光电发射动力学。我们的研究结果预计也是相关的强场光电发射从其他纳米结构，包括光电发射从等离子体纳米领结天线用于载波包络相位检测和PHZ规模的设备。
英文摘要：
Strong-field photoemission from nanostructures and the associated temporally modulated currents play a key role in the development of ultrafast vacuum optoelectronics. Optical light fields could push their operation bandwidth into the petahertz domain. A critical aspect for their functionality in the context of applications is the role of charge interactions, including space charge effects. Here, we investigated the photoemission and photocurrents from nanometric tungsten needle tips exposed to carrier-envelope phase-controlled few-cycle laser fields. We report a characteristic step-wise increase in the intensity-rescaled cutoff energies of emitted electrons beyond a certain intensity value. By comparison with simulations, we identify this feature as the onset of charge-interaction dominated photoemission dynamics. Our results are anticipated to be relevant also for the strong-field photoemission from other nanostructures, including photoemission from plasmonic nano-bowtie antennas used in carrier-envelope phase-detection and for PHz-scale devices.
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