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Fano Resonance Based on Coupling Between Nanoring Resonator and MIM Waveguide for Refractive Index Sensor

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Abstract

Fano resonance is a sharp and asymmetric spectral feature that can be used for refractive index sensing. In this paper, we propose a Fano resonance sensor based on the coupling between a nanoring resonator and a metal-insulator-metal (MIM) waveguide. The nanoring resonator is fabricated in the middle of the MIM waveguide, and the two structures are coupled with high-field confinement. The transmission spectrum of the coupled structure shows a Fano resonance, which is sensitive to the refractive index of the surrounding medium. The sensitivity of the sensor is estimated to be 1700 nm/RIU, which is comparable to the sensitivities of other Fano resonance sensors. In addition, the designed sensor achieves the first-ever FOM and Q factor values of 4300.25 RIU−1 and 4310, respectively, for plasmonic MIM sensors. The proposed sensor is simple to fabricate and can be used for a wide range of refractive index sensing applications.

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Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors are thankful to the Deanship of Scienti fi c Research at Najran University for funding this work under the Research GroupsFunding program grant code (NU/RG/SERC/12/4).

Funding

The authors are thankful to the Deanship of Scientific Research at Najran University for funding this work under the Research Groups Funding program grant code (NU/RG/SERC/12/4).

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Authors and Affiliations

  1. Physics Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt

    Zain Elabdeen A. Mohamed

  2. Physics Department, Islamic University of Gaza, P.O. Box 108, Gaza, Palestine

    Sofyan A. Taya

  3. Electrical Engineering Department, College of Engineering, Najran University, Najran, Kingdom of Saudi Arabia

    Abdulkarem H. M. Almawgani & Ayman Taher Hindi

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  1. Zain Elabdeen A. Mohamed
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Contributions

The authors confirm their contribution to the paper as follows: study conception and design (Zain Elabdeen A. Mohamed). Software (Zain Elabdeen A. Mohamed). Draft manuscript preparation (Zain Elabdeen A. Mohamed). Editing the final version of the manuscript, correction of the language, response to reviews, and adding new figures to the revised version (Sofyan A. Taya, Abdulkarem H. M. Almawgani, Ayman Taher Hindi). All authors reviewed the results and approved the final version of the manuscript.

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Correspondence to Zain Elabdeen A. Mohamed.

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Mohamed, Z.E.A., Taya, S.A., Almawgani, A.H.M. et al. Fano Resonance Based on Coupling Between Nanoring Resonator and MIM Waveguide for Refractive Index Sensor. Plasmonics 19, 567–575 (2024). https://doi.org/10.1007/s11468-023-02009-2

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