An Ultra-Wide Single-Mode Frequency Bandwidth and Low-Flattened Dispersion Hollow-Core Negative-Curvature THz Waveguide
An ultra-wide single-mode (SM) frequency bandwidth and low-flattened dispersion hollow-core negative-curvature (HC-NC) terahertz (THz) waveguide is proposed. SM guidance is achieved by introducing 5-tube nested semi-elliptical tubes (SETs) in the cladding to couple high order modes (HOMs) and claddi...
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Published in | Journal of lightwave technology Vol. 41; no. 18; pp. 6043 - 6052 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
New York
IEEE
15.09.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subjects | |
Online Access | Get full text |
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Summary: | An ultra-wide single-mode (SM) frequency bandwidth and low-flattened dispersion hollow-core negative-curvature (HC-NC) terahertz (THz) waveguide is proposed. SM guidance is achieved by introducing 5-tube nested semi-elliptical tubes (SETs) in the cladding to couple high order modes (HOMs) and cladding modes (CMs). By rotating the nested SETs at the appropriate angle, the HC-NC THz waveguide can achieve excellent SM guidance with HOM extinction ratio (HOMER) >100 within an ultra-wide bandwidth of 460 GHz from the frequency of 0.70 THz to 1.16 THz. The low transmission loss of fundamental mode (FM) (<0.12 dB/m) and low-flattened dispersion (−0.085 ± 0.08 ps/THz/cm) can be obtained simultaneously. To the best of our knowledge, our proposed THz waveguide creates a record of ultra-wide SM frequency bandwidth among the current hollow-core anti-resonant (HC-AR) THz waveguides. Besides, an ultra-high HOMER of 380 and FM loss of only 0.05 dB/m can be achieved at 0.90 THz. In addition, the waveguide also exhibits a good fabrication tolerance. These excellent performances make the proposed HC-NC THz waveguide a great application potential for THz transmission. |
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ISSN: | 0733-8724 1558-2213 |
DOI: | 10.1109/JLT.2023.3269788 |