Journal
PHYSICAL REVIEW APPLIED
Volume 16, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.16.L011002
Keywords
-
Categories
Funding
- JSPS KAKENHI [JP20H02629]
- Research Foundation for Opto-Science and Technology
Ask authors/readers for more resources
Free electrons in an optical standing wave field experience the ponderomotive potential, serving as a refractive-index medium in electron optics. This study demonstrates the divergence and convergence forces provided by tightly focused cylindrically polarized light beams, leading to the creation of concave and convex electron round lenses at the focal point. The convex lens formed by azimuthally polarized beams exhibits negative spherical aberration, differing from conventional electron round lenses created by electrodes and magnetic coils.
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available