In this paper, we numerically and experimentally demonstrate the inverse polarization effect in 3D printed polarizers for the frequency range of 0.5 -2.7 THz. The polarizers consist of 0.3 mm printed strip lines of conductive polylactic acid (CPLA, Proto-Pasta) separated by a 0.3 mm air gap. We report the extinction ratio of five polarizers fabricated with different thicknesses between 1 mm and 5 mm. The experimental and numerical results show that the proposed structure acts as a broadband polarizer between the range of 0.3 THz to 2.7 THz, in which the inverse polarization effect is clearly seen for frequencies above 0.5 THz. In the inverse polarization effect, the transmission of the TE component exceeds that of the TM component, in contrast to the behavior of a typical wiregrid polarizer. Extinction ratios higher than 20 dB for the 5 mm device are reported within the inverse polarization region. This is the first report of the inverse polarization effect in 3D printed structures for the terahertz range.
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