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Plasmonic D-Shaped Bimetallic Coating Refractive Index Sensor

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Abstract

In this work, we present a simple yet highly effective surface plasmon resonance (SPR) biosensor for refractive index (RI) detection in the range of near-infrared (IR). The PCF is coated with an Au layer that is strongly attached to the silica surface of the fiber using titanium dioxide in the shape of a thin adhesive layer. The proposed sensor boasts impressive performance characteristics, including maximum wavelength interrogation sensitivity (WS) of 17,500 nm/RIU in the detection range of 1.37–1.41 and an average sensitivity of 12,500 nm/RIU. Moreover, it demonstrates a max amplitude sensitivity (AS) of 8725.56 RIU−1 and provides a theoretical maximal resolution of 8 × 10−6 RIU using both amplitude and wavelength interrogation techniques. These results represent the highest sensitivity and resolution ever recorded for a PCF-SPR sensor, making it an ideal candidate for detecting biomolecules, chemical analytes, organic compounds, and other substances. The positive outcomes obtained across all analytes tested demonstrate the reliability and robustness of our sensor.

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Funding

This study was funded by the Deputyship for Research & Innovation, Ministry of Education in Saudi Arabia through grant code number IFP22UQU4170008DSR094.

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Authors and Affiliations

  1. Institute of Laser for Postgraduate Studies, University of Baghdad, Baghdad, Iraq

    Ammar M. Tuaimah & Hanan J. Taher

  2. Department of Laser and Optoelectronics Engineering, College of Engineering, Al-Nahrain University, Jadriya, Baghdad, Iraq

    Shaymaa R. Tahhan

  3. Department of Computer Engineering, Umm Al-Qura University, Mecca, 24381, Saudi Arabia

    Fahad Ahmed Al-Zahrani

  4. Department of Electrical and Computer Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK, S7N 5A9, Canada

    Kawsar Ahmed

  5. Group of Biophotomatiχ, Department of Information and Communication Technology (ICT), Mawlana Bhashani Science and Technology University (MBSTU), Tangail, 1902, Bangladesh

    Kawsar Ahmed

Authors
  1. Ammar M. Tuaimah
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  2. Hanan J. Taher
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  3. Shaymaa R. Tahhan
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  4. Fahad Ahmed Al-Zahrani
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  5. Kawsar Ahmed
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Contributions

Conceptualization, Shaymaa R. Tahhan and Kawsar Ahmed; methodology, Shaymaa R. Tahhan, Hanan J. Taher, and Ammar M. Tuaimah; software, Shaymaa R. Tahhan and Hanan J. Taher; validation, Kawsar Ahmed, Shaymaa R. Tahhan and Fahad Ahmed Al-Zahrani; formal analysis, Ammar M. Tuaimah and Shaymaa R. Tahhan; investigation, Ammar M. Tuaimah and Shaymaa R. Tahhan; resources, Shaymaa R. Tahhan and Kawsar Ahmed; data curation, Ammar M. Tuaimah and Shaymaa R. Tahhan; writing—original draft preparation, and writing—review and editing, Ammar M. Tuaimah, Hanan J. Taher, Shaymaa R. Tahhan, Fahad Ahmed Al-Zahrani, and Kawsar Ahmed; supervision, Shaymaa R. Tahhan, Hanan J. Taher, and Kawsar Ahmed; project administration, Shaymaa R. Tahhan, Kawsar Ahmed, and Fahad Ahmed Al-Zahrani; funding acquisition, Fahad Ahmed Al-Zahrani. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Shaymaa R. Tahhan or Kawsar Ahmed.

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Tuaimah, A.M., Taher, H.J., Tahhan, S.R. et al. Plasmonic D-Shaped Bimetallic Coating Refractive Index Sensor. Plasmonics 18, 2393–2404 (2023). https://doi.org/10.1007/s11468-023-01954-2

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  • DOI: https://doi.org/10.1007/s11468-023-01954-2

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