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<p>This paper introduces a numerically analyzed, very sensitive double-sided polished twin-core plasmonic sensor based on photonic crystal fiber (PCF), designed for wide-range refractive index (RI) detection. To identify variations in the RI of the surrounding medium, the sensor design strategically deposits silver externally onto the fiber structure. A thin titanium dioxide layer is applied over the silver to inhibit plasmonic material oxidation and also to increase the coupling strength. A two-attribute interrogation approach integrates both wavelength and amplitude sensitivity in the analysis to enhance RI sensing. Plasmonic material such as silver enhances sensor effectiveness, enabling it to detect small RI changes with high precision. The sensor achieves peak sensitivity of 130,000&#xa0;nm/RIU for wavelength and 1939.83 RIU<sup>−1</sup> for amplitude, with resolution of 1.22 × 10<sup>−7</sup> and 3.45 × 10<sup>−6</sup>&#xa0;RIU, respectively. These high values, calculated within the wide sensing range of 1.20–1.40, ensure dependable detection, crucial for applications requiring precise measurements. An extensive review of the relevant literature revealed that the sensitivities achieved by these interrogation methods are the highest reported for PCF-surface plasmon resonance (SPR) sensors to date. The favorable outcomes and wide sensing capacity also ensure that the proposed sensor is well suited for detecting biomedical analytes as well as organic materials and biochemicals.</p>

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Design Analysis and Optimization of a Twin-Core Double D-shaped Plasmonic Sensor for Detection of Wide-Range Refractive Index

  • 期刊论文

  • 发表日期：

    2025年4月11日

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  • Sudip Chakraborty,
  • Tanmoy Basu,
  • Rudra Sankar Dhar,
  • Arindam Biswas,
  • Sajal Biring,
  • Amit Banerjee

摘要

This paper introduces a numerically analyzed, very sensitive double-sided polished twin-core plasmonic sensor based on photonic crystal fiber (PCF), designed for wide-range refractive index (RI) detection. To identify variations in the RI of the surrounding medium, the sensor design strategically deposits silver externally onto the fiber structure. A thin titanium dioxide layer is applied over the silver to inhibit plasmonic material oxidation and also to increase the coupling strength. A two-attribute interrogation approach integrates both wavelength and amplitude sensitivity in the analysis to enhance RI sensing. Plasmonic material such as silver enhances sensor effectiveness, enabling it to detect small RI changes with high precision. The sensor achieves peak sensitivity of 130,000 nm/RIU for wavelength and 1939.83 RIU−1 for amplitude, with resolution of 1.22 × 10−7 and 3.45 × 10−6 RIU, respectively. These high values, calculated within the wide sensing range of 1.20–1.40, ensure dependable detection, crucial for applications requiring precise measurements. An extensive review of the relevant literature revealed that the sensitivities achieved by these interrogation methods are the highest reported for PCF-surface plasmon resonance (SPR) sensors to date. The favorable outcomes and wide sensing capacity also ensure that the proposed sensor is well suited for detecting biomedical analytes as well as organic materials and biochemicals.