硅微结构中的Laser驱动电子透镜
Laser-Driven Electron Lensing in Silicon Microstructures
摘要：
我们展示了一个激光驱动的，可调谐的电子透镜制作在单片硅。该透镜由硅柱阵列组成，该硅柱阵列由来自光学参量放大器的两个300 fs、1.95 $μ$ m波长、nJ级激光脉冲对称泵浦。柱结构的光学近场将电子聚焦在垂直于柱轴的平面中。在100 $\pm$ 10 MV/m入射激光场的情况下，透镜焦距测量为50 $\pm$ 4 $μ$ m，其对应于1.4 $\pm$ 0.1 MT/m的等效四极聚焦梯度$B'$。通过改变入射激光场强度，可以将透镜从21 $\pm$ 2 $μ$ m焦距（$B'>3.3$ MT/m）调谐到厘米级的焦距。
英文摘要：
We demonstrate a laser-driven, tunable electron lens fabricated in monolithic silicon. The lens consists of an array of silicon pillars pumped symmetrically by two 300 fs, 1.95 $μ$m wavelength, nJ-class laser pulses from an optical parametric amplifier. The optical near-field of the pillar structure focuses electrons in the plane perpendicular to the pillar axes. With 100 $\pm$ 10 MV/m incident laser fields, the lens focal length is measured to be 50 $\pm$ 4 $μ$m, which corresponds to an equivalent quadrupole focusing gradient $B'$ of 1.4 $\pm$ 0.1 MT/m. By varying the incident laser field strength, the lens can be tuned from a 21 $\pm$ 2 $μ$m focal length ($B'>3.3$ MT/m) to focal lengths on the cm-scale.
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