论文标题
自由空间中电子束的光学调制
Optical Modulation of Electron Beams in Free Space
论文作者
论文摘要
我们利用电子束和量身定制的光场之间的自由空间相互作用，以在电子波函数上印刷按需相位剖面。通过涉及电子量子描述的严格半古典理论，我们表明，以真空为集中的单色光场可用于纠正电子束像差并产生所选的焦点形状。利用刺激的弹性康普顿散射来刻画相位，该散射与沿电子路径的集成光场强度成正比，并取决于横梁位置。当前可用的超快电子显微镜设置可实现所需的光强度，从而打开了电子束的自由空间光学操纵场。
We exploit free-space interactions between electron beams and tailored light fields to imprint on-demand phase profiles on the electron wave functions. Through rigorous semiclassical theory involving a quantum description of the electrons, we show that monochromatic optical fields focused in vacuum can be used to correct electron beam aberrations and produce selected focal shapes. Stimulated elastic Compton scattering is exploited to imprint the phase, which is proportional to the integrated optical field intensity along the electron path and depends on the transverse beam position. The required light intensities are attainable in currently available ultrafast electron microscope setups, thus opening the field of free-space optical manipulation of electron beams.
