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Direct Coupling Strategy in Plasmonic Nanocircuits for Low Loss and Easy Fabrication

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Abstract

Plasmonic nanocircuits can deliver light in subwavelength scale, however, require state-of-the-art fabrication process due to the ultra-small footprints. Here, we introduce direct coupling strategy based on metal-insulator-metal (MIM) waveguide systems to reduce the system loss as well as the fabrication difficulty and increase the structural stability. Following this strategy, the coupling between the input waveguide and square ring resonator (SRR) can be realized via an aperture, and for the coupling between SRRs, the metal gap can be removed. The numerical results show that such direct coupling can produce similar effects with conventional indirect coupling in MIM waveguide systems, and the physics mechanism behind as well as influences of geometric parameters on transmission spectrum is also investigated. This work provides a simpler approach to realize on-chip plasmonic nanodevices, such as filters, sensors, and optical delay lines, in practice.

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Funding

This work is supported by the National Natural Science Foundation of China (61671455, 61805278), the Foundation of NUDT (ZK17-03-01), the Program for New Century Excellent Talents in University (NCET-12-0142), and the China Postdoctoral Science Foundation (2018 M633704).

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Authors and Affiliations

  1. College of Liberal Arts and Sciences, National University of Defense Technology, Changsha, 410073, China

    Zhaojian Zhang, Jie Huang & Dingbo Chen

  2. Center of Material Science, National University of Defense Technology, Changsha, 410073, China

    Junbo Yang, Yunxin Han & Xin He

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  1. Zhaojian Zhang
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  2. Junbo Yang
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  4. Xin He
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Correspondence to Zhaojian Zhang.

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Zhang, Z., Yang, J., Han, Y. et al. Direct Coupling Strategy in Plasmonic Nanocircuits for Low Loss and Easy Fabrication. Plasmonics 15, 761–767 (2020). https://doi.org/10.1007/s11468-019-01093-7

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  • DOI: https://doi.org/10.1007/s11468-019-01093-7

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