Electron Round Lenses with Negative Spherical Aberration by a Tightly Focused Cylindrically Polarized Light Beam
Electron Round Lenses with Negative Spherical Aberration by a Tightly Focused Cylindrically Polarized Light Beam
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紧聚焦柱偏振光束产生的具有负球差的电子圆透镜
DOI：
10.1103/physrevapplied.16.l011002
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发表时间：
2021
影响因子：
4.6
通讯作者：
Sato Shunichi
中科院分区：
文献类型：
--
作者：
Uesugi Yuuki;Kozawa Yuichi;Sato Shunichi
在光学驻波场中运动的自由电子感受到有质动力势，在电子光学中充当折射率介质。涉及这种潜力的新兴技术已被提出并在电子显微镜中实现，例如在光学增强腔中使用激光驻波的电子相衬成像。然而，电子和圆柱形分布的光场之间的相互作用还没有被调查，尽管它的电子光学成像系统的适用性。在这项研究中，我们从理论上证明了发散力和会聚力是由紧密聚焦的圆柱偏振光提供的。利用高数值孔径光学透镜聚焦具有环形轮廓的径向和方位偏振光束。聚焦函数处的光强分布分别为凹电子圆透镜和凸电子圆透镜。与由电极和磁线圈产生的传统电子圆透镜相比，由方位角偏振束形成的凸透镜具有负（相反符号）球面像差。这一显著的结果将有助于电子光学成像系统的创新设计和物质波光学的进步。
Free electrons moving in an optical standing wave field feel the ponderomotive potential, acting as a refractive-index medium in electron optics. Emerging technologies involving this potential have been proposed and realized in electron microscopy, such as electron phase-contrast imaging using a laser standing wave in an optical enhancement cavity. However, the interaction between electrons and a cylindrically distributed optical field has not been investigated despite its suitability for electron-optical imaging systems. In this study, we theoretically show that the divergence and convergence forces are provided by tightly focused cylindrically polarized light beams. The radially and azimuthally polarized beams with an annular profile are focused using a high-numerical-aperture optical lens. The intensity distributions at the focus function are concave and convex electron round lenses, respectively. The convex lens formed by the azimuthally polarized beam possesses negative (opposite sign) spherical aberration compared with conventional electron round lenses created by electrodes and magnetic coils. This remarkable result will contribute to the innovative design of electron-optical imaging systems and advances in matter-wave optics.
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DOI：
10.1109/cleo/europe-eqec52157.2021.9541852
发表时间：
2020-03
期刊：
2021 Conference on Lasers and Electro-Optics (CLEO)
影响因子：
--
作者：
A. Feist;S. Yalunin;S. Schafer;C. Ropers
通讯作者：
A. Feist;S. Yalunin;S. Schafer;C. Ropers
卡皮查-狄拉克散射的扩展理论
影响因子：
2.9
作者：
L. Rosenberg
通讯作者：
L. Rosenberg
扫描透射电子显微镜中球面像差校正的全息方法。
影响因子：
3.8
作者：
V. Grillo;A. Tavabi;E. Yucelen;P. Lu;F. Venturi;H. Larocque;L. Jin;A. Savenko;G. Gazzadi;R. Balboni;S. Frabboni;P. Tiemeijer;R. Dunin‐Borkowski;E. Karimi
通讯作者：
E. Karimi
影响因子：
2.9
作者：
M. Kozák
通讯作者：
M. Kozák
影响因子：
1.7
作者：
Yasutugu Takeda;I. Matsui
通讯作者：
I. Matsui