Different plasmonic regimes of laser-plasma terahertz generation

The laser-plasma terahertz generation by one-color ultrashort ionizing pulses is studied using new model allowing the motion of the plasma electrons under forces both linear and quadratic in ionizing optical field. We determine different regimes of generation (with different plasmonic modes excited) and describe how the duration and phase structure of the ionizing pulse can affect not only the terahertz energy, but also the shape of terahertz spectrum due to plasmonic effects.