Robust and adjustable C-shaped electron vortex beams
Robust and adjustable C-shaped electron vortex beams
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DOI：
10.1088/1367-2630/aa6e3c
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发表时间：
2016-07
影响因子：
3.3
通讯作者：
M. Mousley;G. Thirunavukkarasu;M. Babiker;Jun Yuan
中科院分区：
文献类型：
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作者：
M. Mousley;G. Thirunavukkarasu;M. Babiker;Jun Yuan
波前工程是一项重要的量子技术，通常应用于产生携带轨道角动量（OAM）的状态。在这里，我们演示了携带 OAM 的鲁棒 C 形梁态的设计和生产，其中涡旋梁的常见环形横向强度结构包含可调节间隙。我们发现，光束核心中涡线的存在对于维持光束传播过程中 C 形结构的稳定性至关重要。涡核的拓扑电荷主要控制C形的大小，而其张角则与涡-反涡环的存在有关。我们演示了 C 形电子涡旋束的生成和表征，尽管结果同样适用于其他量子波。 C形电子涡流束在平面裂环结构和三维手性结构的纳米级制造以及通过C形间隙旋转进行深度传感和磁场测定方面具有潜在的应用。
Wavefront engineering is an important quantum technology, often applied to the production of states carrying orbital angular momentum (OAM). Here, we demonstrate the design and production of robust C-shaped beam states carrying OAM, in which the usual doughnut-shaped transverse intensity structure of the vortex beam contains an adjustable gap. We find that the presence of the vortex lines in the core of the beam is crucial for maintaining the stability of the C-shape structure during beam propagation. The topological charge of the vortex core controls mainly the size of the C-shape, while its opening angle is related to the presence of vortex–anti-vortex loops. We demonstrate the generation and characterisation of C-shaped electron vortex beams, although the result is equally applicable to other quantum waves. C-shaped electron vortex beams have potential applications in nanoscale fabrication of planar split-ring structures and three-dimensional chiral structures as well as depth sensing and magnetic field determination through rotation of the gap in the C-shape.