Abstract
Polarization of electromagnetic (EM) waves conveys remarkable information in sensitive terahertz (THz) measurements and communications. The conventional methods attain only limited performance over polarization control. Here, we report a powerful method for manipulation of THz polarization (linear-circular-elliptical) during the generation process. The THz wave is excited by photo-mixing of linearly polarized Gaussian lasers in a nonuniform plasma in the presence of external wiggler electric field. The state of THz polarization is tailored with electric wiggler biasing’s help. We find that emitted THz is linearly polarized for zero electric bias, circularly polarized for 15kV/cm wiggler field and elliptically polarized for 0−30kV/cm. We also find that direction of rotation of THz electric field vector depends on the polarity of electric wiggler. THz field ∼1.5×104kV/cm is obtained for laser intensity IL=2.98×1013W/cm2.
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