The interaction of monocycle terahertz (THz) fields with metal nanostructures such as nanotips is attracting a lot of interest for the development of new applications such as THz-scanning tunneling microscopy and ultra-fast field emission. New methods have been introduced to measure the enhanced THz near field waveform in the vicinity of a nanotip surface. Here, we present results obtained by electron field emission in the multiphoton emission regime. The nanotip mimics the behavior of an antenna with a simplified equivalent circuit. We show that the electrical characteristics can be calculated using the nanowire geometry approximation and taking into account a conduction shell with a thickness smaller than the material skin depth. The results introduce a method to predict the antenna response of the nanotip and thus the near THz field waveform.

中文翻译：

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Nanotip 对单周期太赫兹脉冲的响应

单周期太赫兹 (THz) 场与纳米尖端等金属纳米结构的相互作用引起了人们对太赫兹扫描隧道显微镜和超快场发射等新应用开发的极大兴趣。引入了新方法来测量纳米尖端表面附近增强的太赫兹近场波形。在这里，我们展示了在多光子发射机制中通过电子场发射获得的结果。纳米尖端通过简化的等效电路模拟天线的行为。我们表明，可以使用纳米线几何近似计算电气特性，并考虑到厚度小于材料趋肤深度的导电壳。结果引入了一种预测纳米尖端天线响应的方法，从而预测近太赫兹场波形。