自由空间中电子束的光学调制
Optical Modulation of Electron Beams in Free Space
摘要：
我们利用自由空间之间的相互作用，电子束和定制的光场的电子波函数上的打印需求的相位分布。通过严格的半经典理论，涉及的电子的量子描述，我们表明，单色光场集中在真空中可以用来纠正电子束像差，并产生选定的焦点形状。利用受激弹性康普顿散射来压印相位，相位与沿电子路径的积分光场强度成比例，并取决于横向束位置。所需的光强度是可达到的，在目前可用的超快电子显微镜设置，从而打开了自由空间光学操纵的电子束的领域。
英文摘要：
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.
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