| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Refractive Plasmonic Sensor Based on Fano Resonances in an Optical System |
| Wei-Jie Mai1,2, Yi-Lin Wang1,2, Yun-Yun Zhang1,2, Lu-Na Cui1,2, Li Yu1,2** |
1State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876
2School of Science, Beijing University of Posts and Telecommunications, Beijing 100876
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| Cite this article: |
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Wei-Jie Mai, Yi-Lin Wang, Yun-Yun Zhang et al 2017 Chin. Phys. Lett. 34 024204 |
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Abstract A symmetric plasmonic structure consisting of metal–insulator–metal waveguide, groove and slot cavities is studied, which supports double Fano resonances deriving from two different mechanisms. One of the Fano resonances originates from the interference between the resonances of groove and slot cavities, and the other comes from the interference between slot cavities. The spectral line shapes and the peaks of the double Fano resonances can be modulated by changing the length of the slot cavities and the height of the groove. Furthermore, the wavelength of the resonance peak has a linear relationship with the length of the slot cavities. The proposed plasmonic nanosensor possesses a sensitivity of 800 nm/RIU and a figure of merit of 3150, which may have important applications in switches, sensors, and nonlinear devices.
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Received: 23 September 2016
Published: 25 January 2017
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| PACS: |
42.82.Et
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(Waveguides, couplers, and arrays)
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52.25.Fi
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(Transport properties)
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42.82.Gw
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(Other integrated-optical elements and systems)
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| Fund: Supported by the Ministry of Science and Technology of China under Grant No 2016YFA0301300, the National Natural Science Foundation of China under Grant Nos 11374041 and 11574035, and the State Key Laboratory of Information Photonics and Optical Communications. |
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