Particle-in-cell (PIC) simulation study of Plasma dipole oscillation (PDO) for realistic configuration

J. Lee, H. S. Song, D. Park, M. S. Hur

Plasma dipole oscillation (PDO) is proposed previously novel THz emission source [1]. The mechanism of PDO is when two detuned laser pulses collided in plasma strip, moving ponderomotive (PM) potential generated by detuning frequency. Then electrons are trapped in beating potential waves. it just considers motion of electron Because ions are heavy and immobile. trapped electrons oscillated from in-phase generate THz radiation. We proposed the novel approach of PDO for realistic configuration. Normally, we assume that PDO generates in the pre-loaded plasma strip. However, this method is difficult to construct experimentally configuration about PDO. For realistic configure, PDO simulation setup is using field ionization and focusing on oblique angle. If sufficient strength of laser pulse collides, plasma strip is created by field ionization in He neutral gas. It is a very simple configuration experimentally. Also, if you collide two detuned lasers at an oblique angle, you can focus the two lasers on the center of the neutral helium gas. We obtained high peak intensity of dipole field and PDO's total radiation energy from two realistic configuration conditions using 2D Particle-in-cell (PIC) simulation. Thus, PDO maintains high dipole field and radiation energy about GV/m , mJ per mm into the above two realistic configuration conditions. It is quite good results at THz system based on laser-plasma.

[1] Kwon, Kyu Been, et al. "High-energy, short-duration bursts of coherent terahertz radiation from an embedded plasma dipole." Scientific reports 8.1 (2018): 1-9.