Phase space manipulation of free-electron pulses from metal nanotips using combined terahertz near fields and external biasing
Phase space manipulation of free-electron pulses from metal nanotips using combined terahertz near fields and external biasing
复制标题
使用组合太赫兹近场和外部偏置对来自金属纳米尖端的自由电子脉冲进行相空间操纵
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
C. Ropers
中科院分区：
文献类型：
--
作者：
L. Wimmer;O. Karnbach;G. Herink;C. Ropers
本文研究了利用强单周期太赫兹瞬变对金属纳米结构光电子发射的操纵。具体来说，作者使用条纹光谱学来研究暴露于特定静态和太赫兹电场下的金属纳米尖发出的光电子的动能。在详细的数值模拟的支持下，测量结果提供了金属纳米尖端太赫兹近场时间和空间特性的定量信息。研究表明，强静态和动态近场作用对光电子波包的轨迹和相空间密度演化具有深远的控制作用。研究结果对纳米光电子源在超快电子衍射和显微镜中的应用具有重要意义。
This work studies the manipulation of photoelectron emission from metallic nanostructures by intense single-cycle terahertz transients. Specifically, the authors employ streaking spectroscopy to study the kinetic energy of photoelectrons emitted from metal nanotips exposed to tailored static and terahertz electrical fields. Supported by detailed numerical simulations, the measurements provide quantitative information on the temporal and spatial properties of terahertz near fields at metal nanotips. The study illustrates far-reaching control over the trajectories and phase-space density evolution of photoelectron wavepackets acted upon by strong static and dynamic near fields. The results are relevant for applications of nanoscopic photoelectron sources employed in ultrafast electron diffraction and microscopy.