Terahertz Communications Using Effective-Medium-Slot Waveguides
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866915938437169152 |
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| author | Ngo, Nguyen H. Gao, Weijie Ducournau, Guillaume Khelil, Hadjer Nihel Younes, Rita Szriftgiser, Pascal Yamane, Hidemasa Yamada, Yoshiharu Murakami, Shuichi Withayachumnankul, Withawat Fujita, Masayuki |
| author_facet | Ngo, Nguyen H. Gao, Weijie Ducournau, Guillaume Khelil, Hadjer Nihel Younes, Rita Szriftgiser, Pascal Yamane, Hidemasa Yamada, Yoshiharu Murakami, Shuichi Withayachumnankul, Withawat Fujita, Masayuki |
| contents | All-dielectric effective-medium-clad waveguides have been widely exploited in terahertz communications owing to their extremely low loss, low dispersion, and broad bandwidth. In this work, we propose a substrateless effective-medium-slot waveguide. Additionally, we introduce a taper-free interface that allows terahertz waves to directly couple from a metallic hollow waveguide without requiring dielectric insertion. By engineering slot couplers with an effectivemedium channel for impedance and modal matching, the waveguide achieves a fractional 3-dB bandwidth of 40% with a maximum coupling efficiency of 90% in the WR-2.2 band (330-500 GHz). By employing a broadband uni-traveling-carrier photodiode transmitter and sub-harmonic mixer receivers, we achieve an aggregated data rate of 0.8 Tbit/s with quadrature amplitude modulation schemes across 14 channels from 330-600 GHz. The effective-medium-slot waveguide platform yields robust broadband coupling with enhanced mechanical protection, offering reliable interconnects for ultra-high-speed terahertz integrated systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_08261 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Terahertz Communications Using Effective-Medium-Slot Waveguides Ngo, Nguyen H. Gao, Weijie Ducournau, Guillaume Khelil, Hadjer Nihel Younes, Rita Szriftgiser, Pascal Yamane, Hidemasa Yamada, Yoshiharu Murakami, Shuichi Withayachumnankul, Withawat Fujita, Masayuki Optics All-dielectric effective-medium-clad waveguides have been widely exploited in terahertz communications owing to their extremely low loss, low dispersion, and broad bandwidth. In this work, we propose a substrateless effective-medium-slot waveguide. Additionally, we introduce a taper-free interface that allows terahertz waves to directly couple from a metallic hollow waveguide without requiring dielectric insertion. By engineering slot couplers with an effectivemedium channel for impedance and modal matching, the waveguide achieves a fractional 3-dB bandwidth of 40% with a maximum coupling efficiency of 90% in the WR-2.2 band (330-500 GHz). By employing a broadband uni-traveling-carrier photodiode transmitter and sub-harmonic mixer receivers, we achieve an aggregated data rate of 0.8 Tbit/s with quadrature amplitude modulation schemes across 14 channels from 330-600 GHz. The effective-medium-slot waveguide platform yields robust broadband coupling with enhanced mechanical protection, offering reliable interconnects for ultra-high-speed terahertz integrated systems. |
| title | Terahertz Communications Using Effective-Medium-Slot Waveguides |
| topic | Optics |
| url | https://arxiv.org/abs/2601.08261 |