Experiments of forward THz emission from femtosecond laser created plasma with applied transverse electric field in air.

The radiation from laser created plasma with applied electric field is studied numerically and experimentally. We experimentally observed short terahertz radiation with frequency of 0.2 THz forward direction in air using the THz time domain spectroscopy system. The two-dimensional particle in cell simulation shows that the radiation frequency is inversely proportional to the plasma diameter and is good agreement with experimental data. [ABSTRACT FROM AUTHOR]