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26 April 2010 Design and fabrication of hollow flexible terahertz waveguides
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A low loss, hollow, flexible waveguide was designed and fabricated for the transmission of terahertz radiation. Polycarbonate and glass tubing was chosen as the base material of the waveguide. The inner surface of the dielectric tube was coated with silver using a wet chemistry method. The waveguides were fabricated in several diameters namely, 2.4 mm, 3.2 mm, 3.8 mm, and 4.6 mm. The attenuation coefficients for the waveguides were measured at a wavelength of 215 μm using an optically pumped terahertz laser. The free space Gaussian mode from the terahertz laser source was coupled into the lowest loss TE11 mode inside the waveguide. The mode profiles of the output beam from the waveguides were shown. A loss of 3.5 dB/m was measured for the silver coated dielectric tube of diameter 4.6 mm.
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N. Arunkumar, R. H. Giles, T. Goyette, J. Kumar, and W. E. Nixon "Design and fabrication of hollow flexible terahertz waveguides", Proc. SPIE 7671, Terahertz Physics, Devices, and Systems IV: Advanced Applications in Industry and Defense, 76710S (26 April 2010);

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