Electron Round Lenses with Negative Spherical Aberration by a Tightly Focused Cylindrically Polarized Light Beam

Abstract

The interaction of electrons with a cylindrically distributed optical standing wave has not attracted much attention, despite its suitability for electron-optical imaging systems. This study shows that the action of a round lens for electrons is provided by a tightly focused, cylindrically polarized Bessel-Gauss (BG) beam. Here an azimuthally polarized BG beam acts as a convex lens with a negative (opposite sign) spherical aberration, compared to conventional electrostatic or magnetic round lenses. This approach shows a way to light-based electron-optical technology and advances in matter-wave optics.

Topics & Concepts