Transmission Properties of Flexible Dielectric Coated Metallic Hollow Waveguide for QCL at 4.28 THz

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Abstract
In this study, the transmission properties of flexible dielectric coated metallic hollow waveguides at 4.28 THz were studied. Waveguide samples was fabricated, characterized, and quantitatively analyzed including loss and mode structure. High-reflective silver and low-absorptive cyclic olefin polymer (COP) were selected and plated on the inner wall of flexible manufactured polycarbonate (PC) base tubes through dynamic liquid-phase coating method. Waveguides with a theoretically optimized dielectric film thickness and different inner diameters were characterized by using terahertz quantum cascade laser. Their mode structure and energy coupling efficiency with fundamental mode were analyzed. And distinctive results were obtained. The waveguide with 2mm inner has a quasi-single-mode property with coupling efficiency of 90.2%, corresponding to a gaussian field distribution. Moreover, the efficiency is above 89% even as the waveguide is bent to 45°. The transmission loss are 2.5 and 1.7 dB/m for the waveguides with 1mm and 1.5mm inner radius, respectively.
Funding Information
  • National Natural Science Foundation of China (62435020)
  • National Natural Science Foundation of China (12333012)

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