Although substrateless micro-scale silicon waveguides are a useful and versatile platform for terahertz waves, the fact that modal fields occupy the volume of the core limits the potential to dynamically manipulate guided waves. To address this, we introduce an aperiodic lattice structure to enable the monolithic co-integration of a Vivaldi antenna-like mode converter with a substrateless silicon waveguide. This broadband transition is experimentally confirmed to exhibit ∼2.5 dB average loss for two couplers, from 220 GHz to 330 GHz, and enables a photoexcited variable attenuator as proof-of-concept demonstration. This is an important enabling step to incorporate general-purpose dynamic reconfigurability, sensing, and modulation functionality into terahertz-range silicon-based integrated circuits, which are currently limited to primarily all-passive structures.
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12 August 2024
Research Article|
August 12 2024
Monolithically integrated mode converter from terahertz substrateless silicon guide to conductive slotline
Daniel Headland
;
Daniel Headland
a)
(Conceptualization, Formal analysis, Investigation, Software, Writing – original draft)
1
Optoelectronics and Laser Technology Group, Universidad Carlos III de Madrid
, Madrid 28911, Spain
2
Terahertz Engineering Laboratory, The University of Adelaide
, Adelaide, South Australia 5005, Australia
a)Author to whom correspondence should be addressed: [email protected]. URL: https://www.thz-el.org/
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Panisa Dechwechprasit;
Panisa Dechwechprasit
(Conceptualization, Data curation, Methodology, Validation, Writing – review & editing)
2
Terahertz Engineering Laboratory, The University of Adelaide
, Adelaide, South Australia 5005, Australia
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Withawat Withayachumnankul
Withawat Withayachumnankul
(Conceptualization, Funding acquisition, Project administration, Supervision, Writing – review & editing)
2
Terahertz Engineering Laboratory, The University of Adelaide
, Adelaide, South Australia 5005, Australia
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a)Author to whom correspondence should be addressed: [email protected]. URL: https://www.thz-el.org/
Appl. Phys. Lett. 125, 071101 (2024)
Article history
Received:
May 13 2024
Accepted:
July 27 2024
Citation
Daniel Headland, Panisa Dechwechprasit, Withawat Withayachumnankul; Monolithically integrated mode converter from terahertz substrateless silicon guide to conductive slotline. Appl. Phys. Lett. 12 August 2024; 125 (7): 071101. https://doi.org/10.1063/5.0218694
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