Design and Simulation of an Ultra-Sensitive Biosensor Based on Dual-Core Photonic Crystal Fiber with a Gold Plasmonic Layer

Document Type : Original Article

Authors

1 Assistant Professor, Department of Electrical Engineering, Sandaj Branch, Islamic Azad University, Sandaj, Iran

2 PhD student, Department of Electrical Engineering, Sanandaj Branch, Islamic Azad University, Sanandaj, Iran

3 Associate Professor, Shahid Beheshti University, Tehran, Iran

Abstract

The inherent limitations of prism-based surface plasmon resonance (SPR) biosensors, primarily due to their bulky design and dependence on mechanical components, have constrained their deployment in field and operational applications. In light of these challenges, there has been a significant advancement in the development of fiber optic-based SPR biosensors. This paper presents the design of a highly sensitive SPR biosensor utilizing a dual-core photonic crystal fiber (PCF). In this configuration, a gold layer serves as the plasmonic material, enabling the investigation of refractive index variations in the medium surrounding the PCF structure. Surface plasmons are excited through the coupling of the leakage mode of the PCF with the plasmonic mode. Additionally, a thin layer of titanium dioxide (TiO₂) is applied over the gold to prevent oxidation. According to simulations conducted using the Finite element method (FEM) method, the biosensor demonstrates the sensitivity of 7000 nm/RIU in terms of wavelength sensitivity and 380 RIU⁻¹ in terms of amplitude sensitivity, confirming the designed device's applicability in drug detection, biological sensing, and other analytical scenarios.

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Applied Electromagnetics
Volume 12, Issue 2 - Serial Number 29
Autumn and winter 2024
December 2024

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History

  • Receive Date: 19 July 2024
  • Revise Date: 14 September 2024
  • Accept Date: 07 October 2024
  • Publish Date: 06 November 2024

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