Photoexcited multiport terahertz integrated switches with demonstration of multi-beam antennas

Panisa Dechwechprasit; Withawat Withayachumnankul; Harrison Lees; Christophe Fumeaux; Daniel Headland

doi:10.1117/12.3016591

18 June 2024 Photoexcited multiport terahertz integrated switches with demonstration of multi-beam antennas

Panisa Dechwechprasit, Withawat Withayachumnankul, Harrison Lees, Christophe Fumeaux, Daniel Headland

Proceedings Volume PC12994, Terahertz Photonics III; PC1299404 (2024) https://doi.org/10.1117/12.3016591
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

In terahertz system design, the integration of reconfigurable components, and especially switches, is indispensable for routing terahertz signal flow. While on-off switching in the terahertz range has been demonstrated in various topologies, the realization of 1-to-N switching has remained unexplored. This significant gap in dynamically reconfigurable routing capabilities has fundamentally limited the achievable complexity of terahertz systems. To address this, we present 1-to-N switches using cascaded disk resonators in an integrated substrateless silicon waveguide platform. These switches are individually controlled through photoexcitation, achieved by directing a low-power 658-nm laser onto the disk resonator. This action suppresses the resonance and impedes signal coupling into a specific output port. Furthermore, we integrate a 1-to-3 switch monolithically together with a Luneburg lens to realize beam switching. This integration is a major step in terahertz technology, as it is the first demonstration of dynamic reconfigurable beam control in a low-loss terahertz integration platform, opening up promising possibilities for sensing, imaging, and communications.

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Citation Download Citation

Panisa Dechwechprasit, Withawat Withayachumnankul, Harrison Lees, Christophe Fumeaux, and Daniel Headland "Photoexcited multiport terahertz integrated switches with demonstration of multi-beam antennas", Proc. SPIE PC12994, Terahertz Photonics III, PC1299404 (18 June 2024); https://doi.org/10.1117/12.3016591

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KEYWORDS

Switches

Antennas

Laser resonators

Switching

Signal attenuation

Optical testing

Silicon

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