Flexible Elliptical-Gradient Metallic Hollow Waveguide for 0.14 THz Delivery With Mode Tunable Properties

A flexible elliptical-gradient metallic hollow waveguide (EGMHW) is proposed, fabricated, and characterized. It is based on an elliptical-gradient polycarbonate (PC) base tube with inner silver film coating. The property of dynamical mode filtering from large to small port was theoretically analyzed...

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Bibliographic Details
Published in:Journal of lightwave technology Vol. 43; no. 7; pp. 3404 - 3412
Main Authors: Zhao, Benlei, Pei, Xin, Jia, Yunjiang, Jiang, Jiachen, Zhu, Xiaosong, Shi, Yiwei
Format: Journal Article
Language:English
Published: New York IEEE 01.04.2025
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
dynamical mode filtering
Electromagnetic waveguides
Filtration
flexible
Hollow waveguides
low-loss
Optical device fabrication
Optical waveguides
Polarization
polarization-maintaining
Propagation losses
Silver
Structural engineering
Terahertz communications
Terahertz radiation
THz waveguide
Transmission loss
Waveguide theory
Waveguides
ISSN:0733-8724, 1558-2213
Online Access:Get full text
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Summary:A flexible elliptical-gradient metallic hollow waveguide (EGMHW) is proposed, fabricated, and characterized. It is based on an elliptical-gradient polycarbonate (PC) base tube with inner silver film coating. The property of dynamical mode filtering from large to small port was theoretically analyzed and experimentally demonstrated, and it was tuned that only TE 11y remained at the small port. Nonreciprocally, the EGMHW has a relatively low straight transmission loss of 1.2 dB/m at operation frequency 0.14 THz from small to large port, compared to 5.3 dB/m of the inversed direction. This phenomenon and the loss characteristics for different bent angles and radii were analyzed in detail. Measured results show that the waveguide has a great polarization-maintaining performance with a polarization ratio of 99.4% as well as robustness for bending and twisting. Finally, the property of mode filtering was experimentally verified through imaging superposed field distribution of the remained mode and comparing with the corresponding numerical results. This work provides an effective way for the design of flexible low-loss mode-tunable THz waveguides.
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ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2024.3520620