Ultrafast generation and control of an electron vortex beam via chiral plasmonic near fields
Ultrafast generation and control of an electron vortex beam via chiral plasmonic near fields
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DOI：
10.1038/s41563-019-0336-1
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发表时间：
2018-06
期刊：
影响因子：
41.2
通讯作者：
G. Vanacore;G. Berruto;I. Madan;E. Pomarico;P. Biagioni;R. Lamb;D. McGrouther;Ori Reinhardt;I. Kaminer;B. Barwick;H. Larocque;V. Grillo;E. Karimi;F. J. G. D. Abajo;F. Carbone
中科院分区：
文献类型：
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作者：
G. Vanacore;G. Berruto;I. Madan;E. Pomarico;P. Biagioni;R. Lamb;D. McGrouther;Ori Reinhardt;I. Kaminer;B. Barwick;H. Larocque;V. Grillo;E. Karimi;F. J. G. D. Abajo;F. Carbone
涡旋携带的物质波，如手征电子束，在应用科学和基础科学中都有重要的意义。连续波电子涡旋束通常通过被动相位掩模在电子波函数上压印横向相位调制来制备。在这里，我们表明，飞秒手征等离子体激元近场使电子涡旋束的超快时间尺度上的产生和动态控制。使用超快透射电子显微镜在真实的和倒易空间中探测由此产生的电子波包的涡旋结构。这种方法提供了一个高度的可扩展性，以小的长度尺度和阿秒精度的电子涡度的高效操纵。除了直接影响在纳米级超快过程中的手征起着重要作用的调查，我们进一步讨论了使用这种技术来塑造带电复合粒子，如质子的波函数的前景，以及它如何可以用来探测它们的内部结构。
Vortex-carrying matter waves, such as chiral electron beams, are of significant interest in both applied and fundamental science. Continuous-wave electron vortex beams are commonly prepared via passive phase masks imprinting a transverse phase modulation on the electron’s wavefunction. Here, we show that femtosecond chiral plasmonic near fields enable the generation and dynamic control on the ultrafast timescale of an electron vortex beam. The vortex structure of the resulting electron wavepacket is probed in both real and reciprocal space using ultrafast transmission electron microscopy. This method offers a high degree of scalability to small length scales and a highly efficient manipulation of the electron vorticity with attosecond precision. Besides the direct implications in the investigation of nanoscale ultrafast processes in which chirality plays a major role, we further discuss the perspectives of using this technique to shape the wavefunction of charged composite particles, such as protons, and how it can be used to probe their internal structure.