Broadband THz Edge-Enhanced Imaging Technology Based on Electro-Optic Sampling

Abstract Based on the radial Hilbert transform of spatial filtering and electro-optical sampling, we propose a broadband terahertz edge-enhanced imaging method in this work. Instead using narrow-band THz vortex phase plate, here use ultrashort laser pulse to realize enhancement which can be applied for few-cycle imaging. The principle edge is analyzed theoretically, analytical expression final derived. We found that edge-enhancement corresponds nonlinear term field, background linear terms suppressed when static birefringent set zero. simulations show our effectively improve contrast signal-to-noise ratio