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Refractive index sensor based on dual side-coupled rectangular resonators and nanorods array for medical applications

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Abstract

In this paper, a metal–insulator–metal plasmonic sensor with one rectangular and two square nanorod array resonators that shows a Fano resonance is analyzed and suggested. The finite difference time domain method is used to investigate the output spectra and sensing characteristics. The transmission spectra show a sharp and asymmetric shape, because of the narrow-band spectrum and broad-band one affected by two square resonators and rectangular cavity. The coupled mode theory is used to describe the Fano resonance effect. The Fano resonance shows a notable red shift with an increasing dielectric material refractive index. The results show that with optimizing the physical parameters, the sensitivity is attained 1090 nm/RIU, and water and Ethanol temperature sensitivities are achieved as high as 0.087 nm/ °C and 0.475 nm/ °C, respectively. The corresponding figure of merit value is 2 × 104 RIU−1. The proposed structure can be used in photonic integrated devices to perform the sensing operation.

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Acknowledgements

This work was funded by University of Zabol Grant No. UOZ-GR-6230.

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  1. Faculty of Engineering, University of Zabol, P. O. Box 98613-35856, Zabol, Iran

    Mohammad Reza Rakhshani

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Rakhshani, M.R. Refractive index sensor based on dual side-coupled rectangular resonators and nanorods array for medical applications. Opt Quant Electron 53, 232 (2021). https://doi.org/10.1007/s11082-021-02857-4

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