THz Anti-resonant Reflecting Pipe Waveguide
Date Issued
2009
Date
2009
Author(s)
Hsueh, Yu-Chun
Abstract
With the perspective on a flexible, robust and low-cost THz system for various applications, it is essential to develop a low-cost waveguide. Several waveguide solutions have been proposed according to either microwaves or photonics technologies, but the unacceptably high absorption loss in dielectrics and finite metal conductivity at THz range are still challenging the waveguide design. Since the most transparent medium for THz waves broadly available is dry air, guiding THz waves in air is feasible to provide low attenuation THz waveguide delivery. Two different types of THz waveguides have been proposed based on this concept: the sub-wavelength type, and the air-core type. Last time, we have proposed a sub-wavelength type waveguide, such as a fishing line, can successfully guide THz waves with a low attenuation constant less than 0.01cm-1 in the frequency range near 0.3THz. However, THz wave guided on sub-wavelength fiber is sensitive in bending loss and disturbance of surroundings. In this thesis, we successfully proposed and demonstrated a very simple plastic pipe, which confines THz waves within the air-core region. Very different from previous air-core waveguides to design a high-reflection-coated cladding layer, the circular plastic pipe walls are a single-layer structure with a relatively low but uniform refractive index. Our study on the attenuation spectra indicated its anti-resonant reflecting waveguiding nature. Using commercially available Teflon pipes, we confirmed that terahertz waves are successfully guided in the air-core region, with attenuation constant on the order of or less than 0.001 cm-1, coupling efficiency up to 80%, and bandwidth over 200 GHz. We believe that these simple and broadly available THz pipe waveguides can ease and impact many THz applications such as endoscopic imaging and biosensing.
Subjects
THz
terahertz
waveguide
ARROW
antiresonant
pipe
Type
thesis
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