Terahertz wave emission from dual color laser-induced microplasma

We investigated the THz emission from a microplasma induced by a dual color laser field. The addition of the second color significantly enhances the generated terahertz (THz) radiation up to directions perpendicular to the laser propagation axis. Unlike with elongated plasmas, we were able to observe the interplay between two THz generation driving mechanisms: ponderomotive force and AC biasing of the plasma.