Terahertz communications using effective-medium-slot waveguides

All-dielectric effective-medium-clad waveguides have been widely exploited in terahertz communications owing to their extremely low loss, low dispersion, and broad bandwidth. Here, we propose a substrateless effective-medium-slot waveguide. In addition, we introduce a taper-free interface that allows terahertz waves to directly couple from a metallic hollow waveguide without requiring dielectric insertion. We achieve a 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 demonstrate an aggregated data rate of 0.8 Tbit/s with quadrature amplitude modulation schemes across 14 channels from 330 to 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.

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Publication Details

Journal
APL Engineering Physics
Published
2026-05-12
DOI
https://doi.org/10.1063/5.0322259
Primary Topic
Terahertz technology and applications
Type
article
Field-Weighted Citation Impact
0.00

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article

Terahertz communications using effective-medium-slot waveguides

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APL Engineering Physics
Terahertz technology and applications
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Terahertz communications using effective-medium-slot waveguides

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article en

Abstract

All-dielectric effective-medium-clad waveguides have been widely exploited in terahertz communications owing to their extremely low loss, low dispersion, and broad bandwidth. Here, we propose a substrateless effective-medium-slot waveguide. In addition, we introduce a taper-free interface that allows terahertz waves to directly couple from a metallic hollow waveguide without requiring dielectric insertion. We achieve a 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 demonstrate an aggregated data rate of 0.8 Tbit/s with quadrature amplitude modulation schemes across 14 channels from 330 to 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.

APL Engineering PhysicsVol. 1(2)
Toyo University (JP), Technology Research Institute of Osaka Prefecture (JP), Osaka Prefectural Toyonaka Support School (JP), Institut d'Electronique, de Microélectronique et de Nanotechnologie (FR), Osaka Research Institute of Industrial Science and Technology (JP), Laboratoire de Physique des Lasers, Atomes et Molécules (FR), The University of Adelaide (AU), The University of Osaka (JP)
Australia-Japan Foundation, Agence Nationale de la Recherche, Japan Society for the Promotion of Science, Core Research for Evolutional Science and Technology
Affordable and clean energy
Openalex Percentile: Top 8%
Terahertz technology and applications
DOIOpen Access PDFOpenAlex
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