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We study and compare terahertz wave propagation in trapezoidal hollow-core aluminum waveguides with and without ridge with respect to attenuation and single-mode spectral bandwidth. Furthermore, we demonstrate a waveguide-based terahertz interferometer for terahertz sensing based on pure amplitude measurements without the necessity for a direct phase measurement.
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M. Gerhard, R. Beigang, M. Rahm, "Terahertz sensing with waveguides," Proc. SPIE 9854, Image Sensing Technologies: Materials, Devices, Systems, and Applications III, 98540Q (26 May 2016); https://doi.org/10.1117/12.2224106