3D Printed Terahertz Rectangular Waveguides of Polystyrene and TOPAS: a Comparison
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Terahertz (THz) technology is a rapidly developing field as THz systems hold a great potential for basic research, e.g., to study state-selective tunneling phenomena at individual molecules using a THz scanning tunneling microscope  or crystallization processes out of solution using a THz spectrometer . Besides, real world applications such as industrial inspection [3, 4] or THz communications  are intensely discussed. A mature THz technology needs—besides sources and the detectors—devices to guide and manipulate THz waves. These not only include lenses, gratings, prisms, beam splitters, and polarizers but also waveguides and couplers. Recently, it was shown that 3D printing with polystyrene (PS) provides a fast and inexpensive method to produce such elements for the lower THz frequency range [6, 7]. Furthermore, PS provides a good compromise between low THz absorption and printability. However, it was shown that cyclic olefin copolymer—a material with very low THz absorption...
F. Beltran-Mejia received funding from the Finep/Funttel (01.14.0231.00) under the Radiocommunication Reference Center—CRR, project of the National Institute of Telecommunications—Inatel, Brazil.
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