Abstract
A metal–insulator–metal (MIM) waveguide coupled with two unequal vertical rectangular cavities optimized for high sensitivity is proposed in this study. Due to the interaction of the continuum and the discrete state in the waveguide mode, a Fano like profile is obtained in the transmission spectra, the shift of which is utilized to identify the material under sensing. In order to guarantee the maximum device performance, an optimization technique is imposed on the structural parameters, resulting in a maximum sensitivity of 2625.87 nm/RIU and figure of merit (FOM) of 26.04. The sensor has been exploited to determine the human blood group by using the refractive index model proposed for different blood groups A, B, and O. Furthermore, this structure can also be used as a temperature sensor with the temperature sensitivity of \(-1.04 \, \hbox {nm}/^\circ \hbox {C}\). The excellent performance along with the blood sensing and temperature sensing capabilities of the device paves the way toward refractive index sensors that have not only been utilized in microchip processors but also a wide range of biomedical applications.
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Sagor, R.H., Hassan, M.F., Yaseer, A.A. et al. Highly sensitive refractive index sensor optimized for blood group sensing utilizing the Fano resonance. Appl Nanosci 11, 521–534 (2021). https://doi.org/10.1007/s13204-020-01622-5
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DOI: https://doi.org/10.1007/s13204-020-01622-5