Terahertz Radiation from Laser Created Plasma by Applying a Transverse Static Electric Field

Terahertz (THz) radiation, which is emitted in narrow cone in the forward direction from femtosecond laser pulse created plasma has been observed by N.Yugami \textit{et al}. [1]. Additionally, T. Loffler \textit{et al}. have observed that a significantly increased THz emission intensity in the forward direction when the transverse static electric field is applied to the plasma [2]. We propose the theoretical model of the THz radiation from laser created plasma by applying the transverse static electric field and conducted both experiments and 2D-PIC simulation to compared with our theory.\\ \\$[1]$ N. Yugami \textit{et al}, Jpn. J. Appl. Phys. \textbf{45,} L1051 (2006). [2] T. Loffler \textit{et al}, Appl. Phys. Lett. \textbf{77}, 453 (2000).