Terahertz Pipe-Waveguide-Based Components
Date Issued
2011
Date
2011
Author(s)
Lu, Jen-Tang
Abstract
THz technology has been proved to have high potential in a variety of fields such as high-speed telecommunications, bio imaging, molecular detection, material property study, anti-terrorism applications, and astronomical remote sensing. To facilitate THz technology, various kinds of THz fibers and waveguides have been extensively investigated in the past decade. Two years ago, we previously proposed a circular pipe waveguide for low-loss THz waveguiding. With commercial Teflon pipes, an attenuation constant lower than 0.001 cm-1 had been achieved.
In this thesis, we proposed several kinds of THz pipe-waveguide-based components for the purpose of constructing compact and flexible THz systems. We first investigated the bending loss characteristics of the pipe waveguides. It is found that the circular pipe waveguides possess magnificent flexibility and unexpected low bending loss. In order to construct THz polarization controllers and directional couplers, we modified the circular pipe waveguides into square and rectangular ones. The proposed rectangular waveguides not only suffer low attenuation (~0.002 cm-1), but also possess polarization-sensitivity to guided THz waves.
Moreover, we established a THz leaky mode directional coupler with two square pipe waveguides. The proposed directional coupler is polarization-sensitive. Because of the anti-resonant reflecting guiding principle of the pipe waveguides, the directional coupler works most efficiently in the minimal-attenuation wavelength regime. We further devised a simple butt coupler setup to combine circular pipe waveguides and rectangular ones. With butt coupling method, square and rectangular pipe waveguides can be high-efficiently (almost 100%) coupled with circular ones.
It is expected that these low loss, polarization-sensitive waveguide-based components have high potential in future THz applications.
Subjects
Terahertz
THz
Waveguide
Waveguide-Based Components
Pipe
Anti-Resonant
ARROW
SDGs
Type
thesis
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