Abstract
In this paper, a new refractive index sensor based on Fano resonance is introduced. It is mainly composed of two parts: a metal–insulator–metal as a base waveguide and an annular resonant cavity with a double notch and a double convex circle as a coupling structure. The sensing characteristics of the design are investigated via finite element calculations. The influence of the remaining structure parameters on the system’s sensing performance and the relationship between the wavelength corresponding to the Fano trough and the refractive index are also investigated. Furthermore, the structure is applied to refractive index sensors, resulting in a type with a sensitivity of 2740 nm/RIU and a figure of merit of 52.69.
Funder
National Natural Science Foundation of China
Zhejiang Provincial Natural Science Foundation of China
Department of Water Resources of Zhejiang Province
the Key Research and Development Project of Zhejiang Province
the Key R&D Projects of Shanxi Province
Scientific research foundation of Zhejiang University of Water Resources and Electric Power
Subject
Radiology, Nuclear Medicine and imaging,Instrumentation,Atomic and Molecular Physics, and Optics
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