Figure 3
From: Helical Phase Structure of Radiation from an Electron in Circular Motion
Electric field distribution in the upper hemisphere viewed from the z-direction (see Fig. 1), from left to right, for the fundamental (l = 1), second (l = 2) and third (l = 3) harmonics calculated from Eq. (5). The colour represents the field intensity. The fundamental frequency has an intensity maximum in the centre, whereas the harmonics show zero intensity at the centre. Arrows represent the direction of the electric field at a specific time.
