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Design and Optimization of Open-cladded Plasmonic Waveguides for CMOS Integration on Si3N4 Platform

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Abstract

Herein, we present a design analysis and optimization of open-cladded plasmonic waveguides on a Si3N4 photonic waveguide platform targeting CMOS-compatible manufacturing. For this purpose, two design approaches have been followed aiming to efficiently transfer light from the hosting photonic platform to the plasmonic waveguide and vice versa: (i) an in-plane, end-fire coupling configuration based on a thin-film plasmonic structure and (ii) an out-of-plane directional coupling scheme based on a hybrid slot waveguide. A comprehensive numerical study has been conducted, initially deploying gold as the reference metal material for validating the numerical models with already published experimental results, and then aluminum and copper have been investigated for CMOS manufacturing revealing similar performance. To further enhance coupling efficiency from the photonic to the plasmonic part, implementation of plasmonic tapering schemes was examined. After thorough investigation, plasmo-photonic structures with coupling losses per single interface in the order of 1 dB or even in the sub-dB level are proposed, which additionally exhibit increased tolerance to deviations of critical geometrical parameters and enable CMOS-compatible manufacturing.

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Acknowledgments

This work is supported by the European H2020-EU.2.1.1 project PlasmoFab (Contract No. 688166).

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Authors and Affiliations

  1. Department of Informatics, Center for Interdisciplinary Research and Innovation, Aristotle University of Thessaloniki, 57001, Thessaloniki, Greece

    E. Chatzianagnostou, D. Ketzaki, G. Dabos, D. Tsiokos & A. Miliou

  2. Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS-Universitè de Bourgogne, 21078, Dijon, France

    J.-C. Weeber

Authors
  1. E. Chatzianagnostou
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  2. D. Ketzaki
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  3. G. Dabos
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  4. D. Tsiokos
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  5. J.-C. Weeber
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  6. A. Miliou
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Correspondence to E. Chatzianagnostou.

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Chatzianagnostou, E., Ketzaki, D., Dabos, G. et al. Design and Optimization of Open-cladded Plasmonic Waveguides for CMOS Integration on Si3N4 Platform. Plasmonics 14, 823–838 (2019). https://doi.org/10.1007/s11468-018-0863-7

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  • DOI: https://doi.org/10.1007/s11468-018-0863-7

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