P. Wang

Compact Terahertz Vortex Beam Source Based on Smith–Purcell Radiation and a Double‐Layer Metasurface

ABSTRACT Smith–Purcell (SP) radiation, a frequency‐tunable radiation mechanism excited by moving electrons, is a promising route toward compact light sources operating from the terahertz to optical regimes. Vortex beams carrying orbital angular momentum (OAM) have helical phase f...