Propagation loss optimization in metal/dielectric coated hollow flexible terahertz waveguides

Pallavi Doradla; Cecil S. Joseph; Jayant Kumar; Robert H. Giles

doi:10.1117/12.906833

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27 February 2012 Propagation loss optimization in metal/dielectric coated hollow flexible terahertz waveguides

Pallavi Doradla, Cecil S. Joseph, Jayant Kumar, Robert H. Giles

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Proceedings Volume 8261, Terahertz Technology and Applications V; 82610P (2012) https://doi.org/10.1117/12.906833
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

Low-loss hollow flexible metal/dielectric coated polycarbonate waveguides have been designed and fabricated for the maximal transmission of Terahertz radiation (THz). Attenuation characteristics of Terahertz radiation in Ag/Au coated waveguides with bore diameters 4.1 mm, 3.2 mm, 2 mm were studied at 215 µm wavelength and the maximal transmission was obtained by coupling the lowest loss TE₁₁ mode from an optically pumped terahertz laser. Transmission loss can be reduced substantially by adding a dielectric layer to the metal coated waveguide and by coupling HE₁₁ mode into it. Polystyrene (PS) was chosen to be the dielectric, due to its low extinction coefficient, which enhances the transmission through the waveguide. A propagation loss of less than 1 dB/m was achieved with these metal/dielectric coated waveguides.

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Pallavi Doradla, Cecil S. Joseph, Jayant Kumar, and Robert H. Giles "Propagation loss optimization in metal/dielectric coated hollow flexible terahertz waveguides", Proc. SPIE 8261, Terahertz Technology and Applications V, 82610P (27 February 2012); https://doi.org/10.1117/12.906833

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