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Sensing performance of Au–Ag bimetal coated planar waveguide having polyaniline polymer film for biosensing applications

  • Dharamjeet Yadav , Rajendra Kumar , Sushil Kumar , Gaurav Sharma , Gulab Chand Yadav and Vivek Singh EMAIL logo
Published/Copyright: February 18, 2022
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Abstract

Bimetal clad planar waveguide having polyaniline polymer as a guiding layer is proposed and studied for biosensing applications. The dispersion relation and reflectivity of the proposed sensor is obtained using transfer matrix method. The sensing performance and stability of proposed waveguide-based sensor is optimized using different volume fraction of Ag–Au bimetal. The volume fraction 1 represents pure Ag metal coating waveguide that shows maximum sensing performance in our all considered cases. In this case, maximum obtain sensitivity, detection accuracy and quality parameter is 74.140, 11.199 and 559.970°/RIU respectively, at the cover refractive index 1.410. Since, resonance angle and full width at half maxima of resonance peak decreases with increase of Ag metal percentage in Ag–Au bimetal therefore the presence of Au metal decreases the sensing performance of the sensor. Hence, a small volume fraction of Au metal is recommended for higher sensitivity with stability.


Corresponding author: Vivek Singh, Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India, E-mail:

Funding source: Institutions of Eminence (IoE) BHU Varanasi India

Award Identifier / Grant number: No. 6031

Funding source: Science and Engineering Research Board (SERB)

Award Identifier / Grant number: TAR/2019/000066

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This work is supported by the project grant scheme No. 6031, Institutions of Eminence (IoE) BHU Varanasi India and project no. TAR/2019/000066, Science and Engineering Research Board (SERB), DST New Delhi India.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2021-12-17
Accepted: 2022-01-28
Published Online: 2022-02-18
Published in Print: 2024-07-26

© 2022 Walter de Gruyter GmbH, Berlin/Boston

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