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Numerical study of an efficient light focusing nano-coupler based on C-shaped waveguides

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Abstract

We present an FDTD simulation study of a new design of light focusing nano-coupler consisting of a tapered succession of C-shaped silver waveguides. Its operation is based on the use of the fundamental guided mode \(TE_{10}\). Thanks to the optimization of the structural design parameters, we have demonstrated numerically that this compact coupler enables a sub-wavelength light focusing with a transmission coefficient of 65% and a coupling efficiency of 77% that have higher values than the optimized designs reported in the literature. We also show that our structure is an efficient functional coupler at multiple wavelengths when used in a periodic grating as well as an isolated device. This could pave the way for the development of a new generation of metamaterials for guidance and detection applications.

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Authors and Affiliations

  1. Laboratoire de Physique et Chimie Quantique, Université Mouloud Mammeri, Tizi-Ouzou, Algeria

    Fadhila Chehami, Zahia Kebci, Abderrahmane Belkhir & Omar Lamrous

  2. Institut FEMTO-ST, UMR 6174 CNRS, Département d’Optique P. M. Duffieux, Université Bourgogne Franche–Comté, 25030, Besançon Cedex, France

    Fadi Issam Baida

Authors
  1. Fadhila Chehami
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  2. Zahia Kebci
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  4. Fadi Issam Baida
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  5. Omar Lamrous
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Correspondence to Omar Lamrous.

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Chehami, F., Kebci, Z., Belkhir, A. et al. Numerical study of an efficient light focusing nano-coupler based on C-shaped waveguides. Appl. Phys. B 127, 169 (2021). https://doi.org/10.1007/s00340-021-07719-1

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