Multi-Octave All-Dielectric Directional Coupler Using Integrated Half-Mirror for Ultrawideband Terahertz Systems
Date
2025
Authors
Headland, D.
Gallego, D.C.
Sakaki, M.
Benson, N.
Carpintero, G.
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Journal article
Citation
Laser and Photonics Reviews, 2025; 19(16):2401644-1-2401644-11
Statement of Responsibility
Daniel Headland, Daniel C. Gallego, Masoud Sakaki, Niels Benson, Guillermo Carpintero
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Abstract
Network analysis is foundational to calibrated instrumentation for practical handheld devices, and the directional coupler is the fundamental passive component that makes it possible. In this work, a terahertz-range handheld integrated-photonic directional coupler is reported with broad operation bandwidth spanning more than two octaves. The design adapts the underlying ray-tracing principles of classical parabolic reflectors and optical beam splitters to a monolithic substrateless micro-machined silicon structure. This advance holds the potential to unlock a new generation of terahertz systems, including vector network analyzers, that combine the broad bandwidth of bulky quasi-optical terahertz systems with the handheld form-factor and convenient, repeatable port access of guided-wave approaches.
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© 2025 The Author(s). Laser & Photonics Reviews published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.