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Fano Resonances Induced by Strong Interactions Between Dipole and Multipole Plasmons in T-Shaped Nanorod Dimer

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Abstract

A simple T-shaped plasmonic nanostructure composed of two perpendicular coupled nanorods is proposed to produce strong Fano resonances. By the near-field coupling between the “bright” dipole and “dark” quadrupole plasmons of the nanorods, a deep Fano dip is formed in the extinction spectrum, which can be well fitted by the Fano interference model. The effects of the geometry parameters including nanorod length, coupling gap size, and coupling location to the Fano resonances are analyzed in detail, and a very high refractive index sensitivity is achieved by the Fano resonance. Also by adjusting the incident polarization direction, double Fano resonances can be formed by the interferences of the dipole, quadrupole, and hexapole plasmons. The proposed nanorod dimer structure is agile, and a trimer which supports double Fano resonances can be easily formed by introducing a third perpendicular coupled nanorod. The proposed T-shaped nanorod dimer structure may have applications in the fields of biological sensing and plasmon-induced transparency.

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Acknowledgments

This work was supported by the National Science Foundation of China under Grant No.60907025, No.11374048 and the Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

  1. Advanced Photonics Center, Southeast University, Nanjing, China, 210096

    Yun Binfeng, Hu Guohua, Cong Jiawei & Cui Yiping

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  1. Yun Binfeng
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  2. Hu Guohua
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  3. Cong Jiawei
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  4. Cui Yiping
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Correspondence to Cui Yiping.

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Binfeng, Y., Guohua, H., Jiawei, C. et al. Fano Resonances Induced by Strong Interactions Between Dipole and Multipole Plasmons in T-Shaped Nanorod Dimer. Plasmonics 9, 691–698 (2014). https://doi.org/10.1007/s11468-014-9688-1

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  • DOI: https://doi.org/10.1007/s11468-014-9688-1

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