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An efficient directional coupling from dielectric waveguide to hybrid long-range plasmonic waveguide on a silicon platform

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Abstract

The silicon-based three-dimensional hybrid long-range plasmonic waveguide not only supports long-range propagation distance (~mm) but also has an ultra-small modal area (~10−2 μm2) at 1.55 μm. Here, we propose a directional coupler for effective coupling from a dielectric slab-waveguide to the hybrid plasmonic waveguide on a silicon platform. Our simulation results show that the coupler is able to excite hybrid long-range plasmonic mode with short coupling length, low insertion loss, and high extinction ratio. With the arm separation of 0.3 μm, the coupling length can be made 5.2 % of the propagation length of the hybrid plasmonic waveguide, while the insertion loss and extinction ratio are −0.12 and 22.4 dB, respectively. This coupler offers the potential applications in signal routing between the hybrid long-range plasmonic waveguide and dielectric waveguide in the photonic integrated circuits.

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Acknowledgments

This work is supported by NSFC (Grant No. 11104093), and “the Fundamental Research Funds for the Central Universities,” HUST: 2011QN041.

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Authors and Affiliations

  1. Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

    Lin Chen & Dingshan Gao

  2. Department of Electrical and Computer Engineering, McMaster University, Hamilton, ON L8S 4K1, Canada

    Xun Li

Authors
  1. Lin Chen
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  2. Xun Li
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  3. Dingshan Gao
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Correspondence to Lin Chen.

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Chen, L., Li, X. & Gao, D. An efficient directional coupling from dielectric waveguide to hybrid long-range plasmonic waveguide on a silicon platform. Appl. Phys. B 111, 15–19 (2013). https://doi.org/10.1007/s00340-012-5300-6

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  • DOI: https://doi.org/10.1007/s00340-012-5300-6

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