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Fano Resonance in a Gear-Shaped Nanocavity of the Metal–Insulator–Metal Waveguide

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Abstract

The filter function of the metal–insulator–metal (MIM) waveguide with a gear-shaped nanocavity is investigated using the finite-difference time-domain method. Since the gear breaks the symmetric distribution of the resonance, Fano resonance occurs in the gear-shaped nanocavity. Fano resonance strongly depends on the structural parameters of the gear. Compared to the MIM waveguide with a disk-shaped nanocavity, the MIM waveguide with a gear-shaped nanocavity allows for a much more sensitive detection of small refractive index changes of the filled media inside the nanocavity, which reveals a potential sensor application of the MIM waveguide with a gear-shaped nanocavity.

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Acknowledgments

The work was supported by the National Natural Foundation of China (grant nos. 11004160 and 10974161) and the Innovation Fund for Ph.D. students of Southwest Jiaotong University.

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Authors and Affiliations

  1. College of Physics and Information Technology, Shaanxi Normal University, Xi’an, 710062, China

    Z.-D. Zhang & Z.-Y. Zhang

  2. School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, 610031, China

    Z.-D. Zhang & H.-Y. Wang

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  1. Z.-D. Zhang
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  2. H.-Y. Wang
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Correspondence to Z.-Y. Zhang.

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Zhang, ZD., Wang, HY. & Zhang, ZY. Fano Resonance in a Gear-Shaped Nanocavity of the Metal–Insulator–Metal Waveguide. Plasmonics 8, 797–801 (2013). https://doi.org/10.1007/s11468-012-9475-9

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  • DOI: https://doi.org/10.1007/s11468-012-9475-9

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