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首页> 外文期刊>Physical review >Laser-induced field emission from a tungsten nanotip by circularly polarized femtosecond laser pulses
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Laser-induced field emission from a tungsten nanotip by circularly polarized femtosecond laser pulses

机译：圆偏振飞秒激光脉冲从钨纳米尖端产生的激光诱导的场发射

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摘要

We have investigated emission patterns and energy spectra of electrons from a tungsten nanotip induced by circularly polarized femtosecond laser pulses. Variations of emission patterns were observed for different helicities of circular polarization while the energy spectra remained almost identical. The physics behind this difference in emission patterns is the change in propagation directions of surface electromagnetic waves on the tip apex. The energy spectra showed the same spectroscopic signatures as the linearly polarized laser in a strong-field regime, which are a low-energy peak and a plateau feature. The low-energy peak is due to a delayed electron emission with respect to a prompt emission. The experimental data and plasmonic simulations support our previous conclusion, where the observed delayed emission processes originate from an inelastic rescattering process. This work demonstrates that the use of circular polarization is an easy means to add extra knobs to control the spatial and temporal emission from a nanotip at the nanometer and femtosecond scale. It could find applications as a helicity-driven subcycle optical switch.
机译：我们已经研究了圆极化飞秒激光脉冲引起的钨纳米尖端的电子的发射模式和能谱。对于不同的圆偏振度，观察到了发射模式的变化，而能谱却几乎相同。这种发射模式差异背后的物理原理是尖端顶部表面电磁波传播方向的变化。在强场条件下，能谱显示出与线性偏振激光相同的光谱特征，即低能峰和平稳特征。低能量峰是由于相对于即时发射而言电子发射延迟。实验数据和等离激元模拟支持我们先前的结论，其中观察到的延迟发射过程源自非弹性散射过程。这项工作表明，使用圆极化是添加额外旋钮以控制纳米尖端和飞秒级纳米尖端的时空发射的简便方法。它可以作为螺旋驱动的子周期光开关找到应用。

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  • 来源
    《Physical review》 |2020年第4期|045406.1-045406.8|共8页
  • 作者

    Hiroiumi Yanagisawa; Thomas Greber; Christian Hafner; Juerg Osterwalder;

  • 作者单位

    Physics Department Ludwig-Maxiinilians-llniversitaet Munich D-85748 Garching Germany Max Planck Institute of Quantum Optics D-85748 Garching Germany and Institute for Quantum Electronics ETH Zurich CH-8093 Zurich Switzerland;

    Physik-Institut Universitaet Zurich CH-8057 Zurich Switzerland;

    Institute of Electromagnetic Fields ETH Zurich CH-8092 Zurich Switzerland;

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