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<p>A novel photonic crystal fiber structure with two elliptical air-holes at center, surrounded by two hexagonal rings of circular holes, has been investigated for its performance as a wide range SPR-PCF refractive index sensor. The analyte is applied to the outer plasmonic layer, made of gold. The proposed Plasmonic sensor supports the ease of fabrication due to its simplistic structure. The full vector finite element method has been utilized to examine the proposed Plasmonic structure, in terms of several performance metrics, such as confinement loss and sensitivities. The refractive indices between 1.36 and 1.41 have been taken into consideration for the analysis. The sensor has been designed to operate in the mid-infrared band, i.e., 2500–3800&#xa0;nm. The proposed surface Plasmon resonance based PCF sensor has achieved a very remarkable sensor resolution of <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11468_2025_3074_Article_IEq1.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="82" /> </InlineMediaObject> <EquationSource Format="TEX">\(1.67 \times {10}^{-6}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>1.67</mn> <mo>×</mo> <msup> <mrow> <mn>10</mn> </mrow> <mrow> <mo>-</mo> <mn>6</mn> </mrow> </msup> </mrow> </math></EquationSource> </InlineEquation>, as well as 148 per RIU of amplitude sensitivity, and an extremely impressive spectral/wavelength sensitivity of 60,000&#xa0;nm/RIU. The analysis of the proposed design can be suitably extended to sense the other analytes, such as wide range of biomolecules, human body fluids, and other chemicals.</p>

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Highly Sensitive SPR-PCF-Based Mid-Infrared Wide Range Refractive Index Sensor

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Prashant Kumar,
  • Rakesh Ranjan

摘要

A novel photonic crystal fiber structure with two elliptical air-holes at center, surrounded by two hexagonal rings of circular holes, has been investigated for its performance as a wide range SPR-PCF refractive index sensor. The analyte is applied to the outer plasmonic layer, made of gold. The proposed Plasmonic sensor supports the ease of fabrication due to its simplistic structure. The full vector finite element method has been utilized to examine the proposed Plasmonic structure, in terms of several performance metrics, such as confinement loss and sensitivities. The refractive indices between 1.36 and 1.41 have been taken into consideration for the analysis. The sensor has been designed to operate in the mid-infrared band, i.e., 2500–3800 nm. The proposed surface Plasmon resonance based PCF sensor has achieved a very remarkable sensor resolution of \(1.67 \times {10}^{-6}\) 1.67 × 10 - 6 , as well as 148 per RIU of amplitude sensitivity, and an extremely impressive spectral/wavelength sensitivity of 60,000 nm/RIU. The analysis of the proposed design can be suitably extended to sense the other analytes, such as wide range of biomolecules, human body fluids, and other chemicals.