Terahertz optical vortices radiated from laser plasma

This dataset were calculated by photocurrent model in Matlab.In the first, the fundamental vortex beam and the second harmonic generation beam form the two-color field, then focused in air to generate air-plasma, then photocurrent model was used to calculated the local terahertz emission in whole Rayleigh length. Then the diffraction was considered in far field terahertz radiation calculated, becaue of the reversed local terahertz waveform polarity, off-axis phase matching process make the far field distribution shown a ring-shaped pattern which is driving pluses spatial phase-dependent.In local coordinate, dt = 0.08 fs, dx = dy = 10 μm, dz = 100 μm, total volume is 200 μm * 200 μm * 24000 μm.In far field, dx = dy = 1000 μm, detection screen is 225000 μm * 225000 μm.