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The enhancement of sensitivity and depth of field penetration in the coupled SPR-Waveguide-based sensors

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Abstract

We have evaluated the characteristics of the guided modes of a coupled SPR-Waveguide (SPR-WG) configuration consisting of Prism-gold-Dielectric 1-Dielectric 2-analyte and then have compared it with the conventional SPR structures. The penetration depth, the magnetic field distribution profile, the amplitude and phase spectra in this sensor strongly depend on the thickness of the dielectric layers used and the refractive index of the sensing medium (ns). The value of the field penetration depth in the proposed sensor can be increased by changing ns. The results indicated that the penetration depth values for the refractive indices of 1.333 and 1.533 are 8 µm and 80 µm, respectively. In addition, it was found that the SPR-WG sensor provides the highest sensitivity (equivalent to 200 RIU−1) among all sensors at ns = 1.533. The results also showed that the proposed sensor has a high phase sensitivity compared to the conventional SPR sensor. Overall, by adjusting the geometry parameters and ns, these sensors can be used as a useful tool for extracting optical information from biological samples, including prokaryotic and eukaryotic cells.

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The data that support the findings of this study are available from the corresponding author upon reasonable request, and availability of materials is “not applicable”.

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, University of Zanjan, Zanjan, 45371-38791, Iran

    Nasrin Bouzari Saravani & Ramin Mohammadkhani

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  1. Nasrin Bouzari Saravani
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  2. Ramin Mohammadkhani
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Correspondence to Ramin Mohammadkhani.

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Bouzari Saravani, N., Mohammadkhani, R. The enhancement of sensitivity and depth of field penetration in the coupled SPR-Waveguide-based sensors. Appl. Phys. A 128, 1035 (2022). https://doi.org/10.1007/s00339-022-06193-6

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