High-sensitivity refractive index sensors based on Fano resonance in the plasmonic system of splitting ring cavity-coupled MIM waveguide with tooth cavity

A metal–insulator–metal (MIM) waveguide with tooth cavity-coupled ring splitting cavity is proposed. Transmission characteristics and refractive index sensitivity are investigated by using finite-element method. A Fano-like line is observed in the transmission spectrum, and it is caused by the coher...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2019, Vol.125 (1), p.1-5, Article 13
Main Authors: Zhang, Yanjun, Kuang, Yiqin, Zhang, Zhidong, Tang, Yue, Han, Jianqiang, Wang, Ruibing, Cui, Jiangong, Hou, Yulong, Liu, Wenyi
Format: Article
Language:English
Subjects:
Applied physics
Characterization and Evaluation of Materials
Condensed Matter Physics
Fano resonance
Finite element method
Machines
Manufacturing
Materials science
Nanotechnology
Optical and Electronic Materials
Physics
Physics and Astronomy
Processes
Refractivity
Sensitivity
Splitting
Superposition (mathematics)
Surfaces and Interfaces
Teeth
Thin Films
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Summary:A metal–insulator–metal (MIM) waveguide with tooth cavity-coupled ring splitting cavity is proposed. Transmission characteristics and refractive index sensitivity are investigated by using finite-element method. A Fano-like line is observed in the transmission spectrum, and it is caused by the coherent superposition of the narrow discrete and wide continuous states. A maximum sensitivity of 1200 nm/RIU is achieved based on the Fano resonance effect when the air in the MIM waveguide and cavity is replaced by an insulator with a different refractive index. In addition, the derived structures of the plasmonic system are studied, and multiple Fano-like resonances are observed in the transmission spectrum. The effects of the structural parameters of plasmonic system on the Fano resonance are also investigated.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-018-2283-0