用可调谐静电螺旋相位板产生1000个以上轨道angular momentum量子的涡旋电子束
Generation of electron vortex beams with over 1000 orbital angular momentum quanta using a tuneable electrostatic spiral phase plate
摘要：
我们报告使用静电MEMS为基础的设备，以产生高品质的电子涡旋光束与超过1000量子的轨道角动量（OAM）。衍射和离轴电子全息实验表明，在衍射平面中的旋涡的直径与OAM线性增加，从而允许校准的旋涡的角动量内容。具有更大OAM值的电子涡旋束的实现目前受到器件击穿电压的限制。潜在的解决方案，以克服这个问题进行了讨论。
英文摘要：
We report the use of an electrostatic MEMS-based device to produce high quality electron vortex beams with more than 1000 quanta of orbital angular momentum (OAM). Diffraction and off-axis electron holography experiments are used to show that the diameter of the vortex in the diffraction plane increases linearly with OAM, thereby allowing the angular momentum content of the vortex to be calibrated. The realization of electron vortex beams with even larger values of OAM is currently limited by the breakdown voltage of the device. Potential solutions to overcome this problem are discussed.
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