Abstract-Quasi-Wollaston-Prism for Terahertz Frequencies Fabricated by 3D Printing

• A. I. Hernandez-Serrano, 
• E. Castro-Camus
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http://link.springer.com/article/10.1007/s10762-016-0350-1

In this letter, we present the design, fabrication, and characterization of a quasi-Wollaston prism for terahertz frequencies based on form birefringence. The prism uses the birefringence induced in a sub-wavelength layered plastic-air structure that produces refraction in different directions for different polarizations. The component was simulated using the finite-difference-time-domain method, fabricated by 3D printing and subsequently tested by terahertz time-domain spectroscopy showing a polarization separation around of 23° for frequencies below 400 GHz, exhibiting cross polarization power extinction ratios better than 1.6 × 10−3 at 200 GHz.