Quintuple fano-like MIM plasmonics structure based on coupling resonators for refractive index nano-sensor

Shilin Yu; Tonggang Zhao; Jianguo Yu

doi:10.1117/12.2536602

20 November 2019 Quintuple fano-like MIM plasmonics structure based on coupling resonators for refractive index nano-sensor

Shilin Yu, Tonggang Zhao, Jianguo Yu

Author Affiliations +

Proceedings Volume 11191, Advanced Sensor Systems and Applications IX; 111910V (2019) https://doi.org/10.1117/12.2536602
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

Abstract

A compact tunable quintuple Fano-like plasmonics structure, composed of a metal-insulator-metal, a baffle, a quarter ring and a rectangular cavity, was proposed and applied to refractive index sensor in this paper. According to the numerical simulations, quintuple Fano resonances, which derived from the coupling and interference between the narrow discrete state supported by the quarter ring and the rectangular cavity and the broad continuum state excited by the baffle, were obtained in its transmission spectrum. Additionally, the quintuple Fano resonances obtained can be easily tuned by changing the geometric parameters of the resonators. Because of the sharp asymmetry of Fano resonance, the proposed system can be served as a high efficient refractive index sensor with a sensitivity of 1600 nm/RIU and figure of merit (FOM) of 6743. Considering the development of high integrated photonic circuits, it is believed that the proposed structure can find significant applications in optical sensing and optical communication areas.

Citation Download Citation

Shilin Yu, Tonggang Zhao, and Jianguo Yu "Quintuple fano-like MIM plasmonics structure based on coupling resonators for refractive index nano-sensor", Proc. SPIE 11191, Advanced Sensor Systems and Applications IX, 111910V (20 November 2019); https://doi.org/10.1117/12.2536602

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KEYWORDS

Refractive index

Plasmonics

Resonators

Sensors

Diffraction

Finite element methods

Integrated optics

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