期刊
SENSORS
卷 19, 期 22, 页码 -出版社
MDPI
DOI: 10.3390/s19224972
关键词
refractive index sensor; Fano resonance; metal-insulator-metal waveguide; finite element method
资金
- National Natural Science Foundation of China [61675185, 61875250, 61975189]
- Fund for Shanxi '1331 Project' Key Subject Construction
Herein, a compact refractive index nanosensor comprising a metal- insulator- metal (MIM) waveguide with symmetric two triangle stubs coupled with a circular split-ring resonance cavity (CSRRC) is theoretically presented. An analysis of the propagation characteristics of the designed structure is discussed employing the finite element method (FEM). The calculation results revealed that a Fano resonance outline emerged, which results from an interaction between the continuous broadband state of the waveguide with two symmetric triangle stubs and the discrete narrowband state of the CSRRC. The influence of geometric parameters on sensing properties was studied in detail. The maximum sensitivity reached 1500 nm/RIU with a high figure of merit of 65.2. The presented structure has great applications for on-chip plasmonic nanosensors.
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