Research / 2019 / Article / Fig 3

Research Article

Spiral Field Generation in Smith-Purcell Radiation by Helical Metagratings

Figure 3

Theoretical equivalent model of the helical metagrating and the calculated radiation fields. (a) Equivalent electric dipole array of the spiral field Smith-Purcell radiation for the left-handed helical metagrating. (b) Calculated Ez field distribution and the (c) corresponding phase distribution at 1.5 THz.