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A multi-element interdigitated photoconductive emitter for broadband THzpolarization rotation is proposed and experimentally verified. The deviceconsists of separate pixels for the emission of horizontally and verticallypolarized THz radiation. The broadband (0.3-5.0THz) nature of the device isdemonstrated, and the polarization angle of the generated far-field THzradiation is shown to be readily controlled by varying the relative biasvoltage applied to the horizontally and vertically emitting pixels. The deviceis scalable in design, and with its simple method of polarization rotation itallows the modulation of the generated THz polarization at rates significantlyfaster than those achievable in ellipsometry systems based on mechanicallyrotating components.

Scalable interdigitated photoconductive emitters for the electrical modulation of terahertz beams with arbitrary linear polarization