Onset of charge interaction in strong-field photoemission from nanometric needle tips
Onset of charge interaction in strong-field photoemission from nanometric needle tips
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DOI：
10.1515/nanoph-2021-0276
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发表时间：
2021-08
期刊：
影响因子：
7.5
通讯作者：
J. Schötz;L. Seiffert;Ancyline Maliakkal;Johannes Blöchl;D. Zimin;P. Rosenberger;B. Bergues;P. Hommelhoff;F. Krausz;T. Fennel;M. Kling
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文献类型：
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作者：
J. Schötz;L. Seiffert;Ancyline Maliakkal;Johannes Blöchl;D. Zimin;P. Rosenberger;B. Bergues;P. Hommelhoff;F. Krausz;T. Fennel;M. Kling
纳米结构的强场光发射及其相关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。光场可以将它们的工作带宽推到千赫兹域。它们在应用环境中功能的一个关键方面是电荷相互作用效应的影响。在这里，我们研究了纳米钨针尖暴露在载流子包络相（CEP）控制的少周期激光场中的光发射和光电流。我们报告了在超过一定强度值后，发射电子的强度重标截止能量的特征快速增加。通过与模拟的比较，我们确定这一特征是电荷相互作用主导的光电动力学的开始。我们的结果预计也与其他纳米结构的强场光发射有关，包括用于cep探测和phz尺度器件的等离子体纳米领结天线的光发射。
Abstract 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 of their functionality in the context of applications is the impact of charge interaction effects. Here, we investigated the photoemission and photocurrents from nanometric tungsten needle tips exposed to carrier-envelope phase (CEP)-controlled few-cycle laser fields. We report a characteristic rapid 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 nanobowtie antennas used in CEP-detection and for PHz-scale devices.