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Volume 12
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10.3390/bios12050306
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Article

Multimode Fano Resonances Sensing Based on a Non-Through MIM Waveguide with a Square Split-Ring Resonance Cavity

by
Jianfeng Chen
1,2,3,†,
Xinyu Lian
4,†,
Ming Zhao
1,3 and
Chenbo Xie
1,3,*
1
Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
2
University of Science and Technology of China, Hefei 230026, China
3
Advanced Laser Technology Laboratory of Anhui Province, Hefei 230037, China
4
School of Instrument Science and Optoelectronic Engineering, Hefei University of Technology, Hefei 230009, China
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Biosensors 2022, 12(5), 306; https://doi.org/10.3390/bios12050306
Submission received: 12 April 2022 / Revised: 4 May 2022 / Accepted: 5 May 2022 / Published: 6 May 2022
(This article belongs to the Special Issue Waveguide Biosensors)
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Abstract

In this article, a non-through metal–insulator–metal (MIM) waveguide that can excite fivefold Fano resonances is reported. The Fano resonances are obtained by the interaction between the modes excited by the square split-ring resonator (SSRC) and the bus waveguide. After a detailed analysis of the transmission characteristics and magnetic field strength of the structure using the finite element method (FEM), it was found that the independent tuning of Fano resonance wavelength and transmittance can be achieved by adjusting the geometric parameters of SSRC. In addition, after optimizing the geometric parameters, the refractive index sensing sensitivity (S) and figure of merit (FOM) of the structure can be optimal, which are 1290.2 nm/RIU and 3.6 × 104, respectively. Additionally, the annular cavity of the MIM waveguide structure can also be filled with biomass solution to act as a biosensor. On this basis, the structure can be produced for optical refractive index sensing in the biological, micro and nano fields.
Keywords: non-through MIM waveguide; fivefold Fano resonances; independent tuning; refractive index sensing non-through MIM waveguide; fivefold Fano resonances; independent tuning; refractive index sensing

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MDPI and ACS Style

Chen, J.; Lian, X.; Zhao, M.; Xie, C. Multimode Fano Resonances Sensing Based on a Non-Through MIM Waveguide with a Square Split-Ring Resonance Cavity. Biosensors 2022, 12, 306. https://doi.org/10.3390/bios12050306

AMA Style

Chen J, Lian X, Zhao M, Xie C. Multimode Fano Resonances Sensing Based on a Non-Through MIM Waveguide with a Square Split-Ring Resonance Cavity. Biosensors. 2022; 12(5):306. https://doi.org/10.3390/bios12050306

Chicago/Turabian Style

Chen, Jianfeng, Xinyu Lian, Ming Zhao, and Chenbo Xie. 2022. "Multimode Fano Resonances Sensing Based on a Non-Through MIM Waveguide with a Square Split-Ring Resonance Cavity" Biosensors 12, no. 5: 306. https://doi.org/10.3390/bios12050306

APA Style

Chen, J., Lian, X., Zhao, M., & Xie, C. (2022). Multimode Fano Resonances Sensing Based on a Non-Through MIM Waveguide with a Square Split-Ring Resonance Cavity. Biosensors, 12(5), 306. https://doi.org/10.3390/bios12050306

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