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A Highly Sensitive Structure Based on Prism, Silver, and Titanium Dioxide for Biochemical Sensing Applications

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Abstract

In this paper, a refractive index (RI) sensor with prism configuration is proposed and numerically investigated for sensing applications. The sensor design is based on a BK7 prism, silver (Ag), and titanium dioxide (TiO2). Important enhancement in the sensitivity and reflection deep is obtained by optimizing some geometric and optical parameters. The transfer matrix method (TMM) is employed to investigate the reflectance of the sensor at wavelength interrogation. RI sensitivity (SRI), figure of merit (FoM), and quality factor (QF) are three important parameters that are considered to determine the design performance. The SRI, FoM, and QF offered by the nanostructure are 6300 nm/RIU, 52.24 RIU−1, and 11.04, respectively, when the refractive index is varied from 1.33 to 1.41. We have successfully detected various chemical entities in an aqueous solution, such as heavy metals, lactose, ethanol, and sodium chloride (NaCl), using a wavelength interrogation-based SPR biosensor.

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Authors and Affiliations

  1. Laboratoire d’Études des Milieux Ionisés et Réactifs (EMIR), Institut Préparatoire aux Études des Ingénieurs de Monastir, Université de Monastir, 5019, Monastir, Tunisia

    Imed Sassi, Mounir Ben El Hadj Rhouma & Mariem Zbidi

  2. Department of Electrical Engineering, President University INA, Cikarang Utara, Bekashi Regency, West Java, 17530, Indonesia

    Joni Welman Simatupang

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  1. Imed Sassi
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  2. Mounir Ben El Hadj Rhouma
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  3. Mariem Zbidi
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  4. Joni Welman Simatupang
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Contributions

Material preparation, data collection, and analysis were performed by Imed Sassi. The manuscript was written with contributions from all authors. All authors have given approval to the final version of the manuscript. Imed Sassi wrote the first draft of the manuscript, and all authors commented on the previous versions. The detailed contributions of each co-author are as follows: conceived and designed the devices: Imed Sassi and Mariem Zbidi. Performed the numerical simulation: Imed Sassi. Analyzed the data: Imed Sassi. Drafted the manuscript: Imed Sassi, Mariem Zbidi, and Joni Welman Simatupang. Revised the manuscript: Imed Sassi, Mounir Ben El Hadj Rhouma, Mariem Zbidi, and Joni Welman Simatupang.

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Correspondence to Imed Sassi.

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Not applicable. The work presented in this manuscript is mathematical modeling only for the proposed biosensor. No experiment was performed on the human body and living organism/animal so ethical approval from an ethical committee is not required.

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The authors declare no competing interests.

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Sassi, I., Rhouma, M.B.E.H., Zbidi, M. et al. A Highly Sensitive Structure Based on Prism, Silver, and Titanium Dioxide for Biochemical Sensing Applications. Plasmonics (2024). https://doi.org/10.1007/s11468-024-02271-y

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