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Robust Plasmonic Fano Resonances in π-Shaped Nanostructures

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Abstract

Plasmonic Fano resonances hold immense potential for biosensors and optical information processing due to their sharp spectral response. A majority of nanogap-involved complex metallic nanostructures have been demonstrated to support Fano resonances, but the gap distance between the constituents are very difficult to control without the use of sophisticated microfabrication techniques. Here, we propose a simple π-shaped metallic nanostructure that is free from the particular requirement of nanogaps to generate a strong plasmonic Fano resonance. The plasmonic Fano resonance is demonstrated to be a result of the interference between a broad magnetic dipolar mode and a narrow electric quadrupolar mode. We realize the π-shaped nanostructure experimentally by employing the angle-resolved nanosphere lithography to produce partially overlapped double metallic nanotriangles. The effect of the geometry parameters including the length of the base and the size of π-shaped nanostructure on the Fano resonance is investigated in detail. As an application example, we further show that the π-shaped double metallic nanotriangles could be used as a Fano-based sensor for refractive index sensing, in which a threefold enhancement of sensitivity is achieved as compared with the single nanotriangle-based sensor.

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Acknowledgments

This work was supported by the State Key Program for Basic Research of China (SKPBRC) under Grant Nos. 2012CB921501, 2013CB632703, and 2012CB933800, and by the National Nature Science Foundation of China (NSFC) under Grant Nos. 11174137, 91221206, 11274160, 51271092, 21035002, and 21275070.

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Authors and Affiliations

  1. School of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China

    Zhendong Yan, Ping Gu, Wei Du, Zhuo Chen & Zhenlin Wang

  2. School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China

    Wenjing Bao & Xinhua Xia

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  1. Zhendong Yan
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  2. Ping Gu
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  3. Wenjing Bao
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  4. Wei Du
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  5. Zhuo Chen
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  6. Xinhua Xia
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  7. Zhenlin Wang
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Correspondence to Zhuo Chen or Zhenlin Wang.

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Yan, Z., Gu, P., Bao, W. et al. Robust Plasmonic Fano Resonances in π-Shaped Nanostructures. Plasmonics 10, 1159–1166 (2015). https://doi.org/10.1007/s11468-015-9908-3

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  • DOI: https://doi.org/10.1007/s11468-015-9908-3

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