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. 2022 Oct 11;12(45):28985-28996.
doi: 10.1039/d2ra04184g.

Hybrid Tamm plasmon resonance excitation towards a simple and efficient biomedical detector of NaI solution

T A Taha  1 , Hussein A Elsayed  2 , Ahmed Mehaney  2 , Ali Hajjiah  3 , Ashour M Ahmed  4   5
Affiliations

Hybrid Tamm plasmon resonance excitation towards a simple and efficient biomedical detector of NaI solution

T A Taha et al. RSC Adv. .

Abstract

This work presents a theoretical verification for the detection of Sodium iodide (NaI) solution with different concentrations in the vicinity of Tamm plasmon (TP) resonance. The proposed sensing tool is constituted of {prism/Ag/cavity/(GaN/CaF2)15/air}. The essential foundation of this study is based on the displacement of the TP resonance by varying the concentration of an aqueous solution of sodium iodide (NaI) that fills the cavity layer. The resonant TP dip is shifted downwards the shorter wavelengths with the increment of the Ag layer thickness. Nevertheless, the resonant TP dip is shifted upwards to longer wavelengths with the increment of NaI refractive index/concentration. Also, the sensitivity of the sensing tool decreases with the increment of the NaI refractive index. However, the minimum result is not less than the value of 9913 nm RIU-1 for a concentration of 25%. Finally, the performance of our sensor in the form of the quality factor, detection limit, and figure of merit showed significant improvements in designing a high-performance liquid and biosensor.

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Conflict of interest statement

The authors declare they have no conflicts of interests.

Figures

Fig. 1
Fig. 1. The suggested design of NaI sensor that constituted as, {prism/Ag/cavity/(GaN/CaF2) 15/air substrate}.
Fig. 2
Fig. 2. The reflectivity of the suggested structure that configured as, {prism/(GaN/CaF2)15/air} in the absence of the Ag layer and for the normal incidence case.
Fig. 3
Fig. 3. The reflectance spectrum of the suggested NaI sensor that configured as, {prism/Ag/cavity/(GaN/CaF2)15/air} for normal incidence case.
Fig. 4
Fig. 4. The reflectivity of the proposed design in the case of the oblique incidence for TE mode of polarization at an angle of incidence = 50°.
Fig. 5
Fig. 5. The response of TP resonance versus the change in the thickness of the Ag layer.
Fig. 6
Fig. 6. The shift in the position of TP resonance mode relative to the variation in the cavity layer thickness from 3.5 μm to 5.2 μm.
Fig. 7
Fig. 7. The shift in the TP resonance mode relative to the change in the concentration of NaI solution.
Fig. 8
Fig. 8. The position of TP resonance as a function of refractive index for NaI solution.
Fig. 9
Fig. 9. The sensitivity of the proposed sensing tool versus the change in the refractive index of NaCl solution.
Fig. 10
Fig. 10. The change in the values of FWHM of TP resonance with the variations in the refractive index of NaI solution.
Fig. 11
Fig. 11. The dependence of QF on the refractive index of NaI solution.
Fig. 12
Fig. 12. The detection limit of the proposed sensor with respect to the change in the refractive index of the NaI solution.
Fig. 13
Fig. 13. The response of the figure of merit versus the refractive index of NaI solution.
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