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Exploration of LSPR-based Refractive Index Sensor Coated with Silver-MgF2 Layer

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Abstract

A refractive index (RI) sensor has been demonstrated and numerically analyzed by the finite element method (FEM) to gain supreme sensitivity on the basis of localized surface plasmon resonance (LSPR). Plasmonic material, such as silver, has been used as a coating layer outside of the dielectric core. Various structural parameters have been analyzed for the proposed sensors, which have a significant influence on the sensing field. To make the sensing strength much stronger, a thin MgF2 layer has been added to the silver layer. The wavelength and amplitude interrogation method achieves extremely high wavelength sensitivity (WS) responses of 948.67 μm/RIU and amplitude sensitivity (AS) responses of − 1602.82 RIU−1 in the analyte RI range of 1.35 to 1.38. The operating wavelength range of 5.5–7.5 μm shows efficient results in this structure. The proposed sensor is used for identifying analytes in the biological and biochemical fields and is also applicable in bio-photonics. Owing to its low confinement losses and simply designed structure, the proposed RI sensor will be extensively appropriate for bio-sensing because of its outstanding sensitivity response.

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Acknowledgements

The authors extend their appreciation to the Deputyship for Research & Innovation, Ministry of Education in Saudi Arabia for funding this research work through project number: IFP22UQU4170008DSR03.

Funding

The Grant Code is IFP22UQU4170008DSR03.

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Authors and Affiliations

  1. Department of Information and Communication Technology, Mawlana Bhashani Science and Technology University, Santosh, Tangail-1902, Bangladesh

    Nilanjana Basak, Naznin Sultana & Sumaiya Akhtar Mitu

  2. Department of ECE, Saveetha Engineering College, Chennai, China

    Vinod Kumar R

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

    Fahad Ahmed Al-Zahrani

  4. Department of Computer Engineering, Marwadi University, Rajkot, Gujarat, India

    Shobhit K. Patel

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

    Kawsar Ahmed

  6. Group of Bio-photomatiχ, Information and Communication Technology, Mawlana Bhashani Science and Technology University, Santosh, Tangail-1902, Bangladesh

    Kawsar Ahmed

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  1. Nilanjana Basak
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  2. Naznin Sultana
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  7. Kawsar Ahmed
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Contributions

Conceptualization: K. Ahmed. Data curation, formal analysis, investigation, methodology: N. Basak, N. Sultana, S.A. Mitu. Funding acquisition, F.A. Al-Zahrani. Project administration: K. Ahmed. Resources, software: N. Basak, N. Sultana, S.A. Mitu, R.V. Kumar, S.K. Patel. Supervision: K. Ahmed. Validation: K. Ahmed. Visualization: N. Basak, N. Sultana, S.A. Mitu. Writing-original draft: N. Basak, N. Sultana, S.A. Mitu, K. Ahmed, F.A. Al-Zahrani. Writing-review editing: N. Basak, N. Sultana, S.A. Mitu, K. Ahmed, F.A. Al-Zahrani, R.V. Kumar, S.K. Patel.

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Correspondence to Kawsar Ahmed.

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Basak, N., Sultana, N., Mitu, S.A. et al. Exploration of LSPR-based Refractive Index Sensor Coated with Silver-MgF2 Layer. Plasmonics 18, 271–282 (2023). https://doi.org/10.1007/s11468-022-01767-9

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