Figure 2
From: Atom size electron vortex beams with selectable orbital angular momentum
Electron optical setup for the generation of a switchable electron vortex state. (a) Schematic path of rays through the illumination lens system of the microscope. Here, Ci, ADL, TLxx, MC and OL denote the ith condenser lens, the adapter and transfer lenses of the probe corrector (grey box), the mini condensor, and the objective lenses, respectively. (b) Magnification of the section between the 2nd (C2) and 3rd (C3) condensor lens (marked by a yellow rectangle in a), including the vortex aperture in the C2 aperture position. Blue, green, and red beams represent electron vortex beams with OAM of L = −1, L = 0 and L = +1, respectively.
