Polarization-resolved time-domain traces for THz pulses emitted from the multi-pixel interdigitated photoconductive emitter at target polarization angles of (a) ψ_T = 0°, (b) ψ_T = 45° and (c) ψ_T = 90°. (d) The corresponding Fourier transform spectra of each component to the time-domain traces in (a)-(c). (e) and (f) show the orientation angle and ellipticity, respectively, at each target angle.