Using a ZnSe large aperture photoconductive antenna with a specific electrode structure, we demonstrate the generation of intense, sub-cycle terahertz (THz) pulses with variable elliptical polarization and peak fields above 80 kV/cm. The electrode structure is composed of six units, where three units have interdigitated horizontal electrodes, and the other three units have an interdigitated structure with vertical electrodes. The units with horizontal and vertical electrodes are positioned alternatively onto the antenna, allowing the generation of two quasi-half-cycle THz pulses with orthogonal polarization. A time delay between the two THz pulses is introduced by a phase-delay mask covering only the parts of the antenna with horizontal electrodes. By changing the mask thicknesses, we can control on demand, the polarization state of the THz pulses from linear polarization to elliptical to circular polarization over a quarter of a THz cycle.
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