Measurement and Control of Radially Polarized THz Radiation from DC-Biased Laser Plasma Filaments in Air

Detection and manipulation of radially polarized terahertz (THz) radiation is essential for many applications. A new measurement scheme is proposed for the diagnosis of radially polarized THz radiation from a longitudinal dc-biased plasma filament, by introducing a movable metal mask. The amplitude and spectrum of the radially polarized THz beam was measured with a -cut ZnTe crystal, where the THz beam pattern was modulated by the mask. Based on this measurement scheme, it was demonstrated that the amplitude and spectrum of the radially polarized THz radiation from the longitudinal dc-biased filament could be manipulated by controlling the strength and the location of the dc-biased field.

Automated summary

This paper proposes a measurement scheme for the diagnosis of radially polarized terahertz (THz) radiation. The amplitude and spectrum of the THz beam can be modulated by introducing a movable metal mask. It has been demonstrated that the amplitude and spectrum of the radially polarized THz radiation can be manipulated by controlling the strength and the location of the dc-biased field.