Efficient Measurement of the Orbital-Angular-Momentum Spectrum of an Electron Beam via a Dammann Vortex Grating
Efficient Measurement of the Orbital-Angular-Momentum Spectrum of an Electron Beam via a Dammann Vortex Grating
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DOI：
10.1103/physrevapplied.12.064062
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发表时间：
2019-12
影响因子：
4.6
通讯作者：
Yuuki Noguchi;Shota Nakayama;T. Ishida;K. Saitoh;M. Uchida
中科院分区：
文献类型：
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作者：
Yuuki Noguchi;Shota Nakayama;T. Ishida;K. Saitoh;M. Uchida
测量电子束的轨道角动量 (OAM) 状态在各种应用中都非常重要。在这里，我们演示了一种利用二维达曼涡旋光栅（DVG）有效测量电子束 OAM 光谱的方法。该光栅使我们能够使用其值在 -10ħ 和 10ħ（OAM 光谱）之间的 OAM 组件同时测量透射电子显微镜中的输入电子束。然后，我们通过实验评估了 DVG OAM 分析仪在测量螺旋波带片和纳米制造磁针产生的电子束时的性能。我们的评估支持了这种方法的有效性，这为实现广泛的电子 OAM 应用（包括纳米级成像和材料科学）铺平了道路。
Measuring the orbital-angular-momentum (OAM) states of electron beams is of great importance in diverse applications. Here, we demonstrate a method to effectively measure the OAM spectrum of an electron beam by exploiting a two-dimensional Dammann vortex grating (DVG). This grating enables us to simultaneously measure an input electron beam in a transmission electron microscope using its OAM components with values between −10ħand 10ħ(OAM spectrum). We then experimentally evaluate the performance of the DVG OAM analyzer when measuring electron beams generated by spiral zone plates and nanofabricated magnetic needles. Our evaluation supports the validity of this approach, which paves the way toward enabling a wide range of electron OAM applications, including in nanoscale imaging and in materials science.