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<p>The proposed sensor presents a dual core circular shaped photonic crystal fibre sensor based on the surface plasmon resonance concept for the detection of the different bio-analytes and chemicals with the concentrations/refractive indices varying from 1.30 to 1.40. The coating of gold as plasmonic material of 25&#xa0;nm thickness is used on surface of silica to introduce the plasmonic effect in the PCF sensor. When the different samples are introduced to the sensor, it provides distinct absorption peak at different resonant wavelengths according to the bio-analytes used. With the help of these absorption peaks, we can calculate the sensitivity. The maximum sensitivity of the sensor designed in this paper comes to be 10,000&#xa0;nm/RIU. Hence, the proposed sensor gives the better performance and it is easy to build due to its simple design. The optimum resolution of the proposed sensor is equal to 1×<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="12596_2025_2455_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="32" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:{10}^{-5\:}\)</EquationSource> </InlineEquation>RIU which makes the sensor more efficient to perform the work. The whole mechanism of analysing the sensor is performed on Finite Element Method by using COMSOL Multiphysics Software.</p>

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Sensitivity improvement of photonic crystal fiber for refractive index sensing

  • 期刊论文

  • 发表日期：

    2025年1月17日

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  • Shivam Kumar Singh,
  • Anshika Srivastava,
  • Aditya Maurya,
  • Alka Verma

摘要

The proposed sensor presents a dual core circular shaped photonic crystal fibre sensor based on the surface plasmon resonance concept for the detection of the different bio-analytes and chemicals with the concentrations/refractive indices varying from 1.30 to 1.40. The coating of gold as plasmonic material of 25 nm thickness is used on surface of silica to introduce the plasmonic effect in the PCF sensor. When the different samples are introduced to the sensor, it provides distinct absorption peak at different resonant wavelengths according to the bio-analytes used. With the help of these absorption peaks, we can calculate the sensitivity. The maximum sensitivity of the sensor designed in this paper comes to be 10,000 nm/RIU. Hence, the proposed sensor gives the better performance and it is easy to build due to its simple design. The optimum resolution of the proposed sensor is equal to 1× \(\:{10}^{-5\:}\) RIU which makes the sensor more efficient to perform the work. The whole mechanism of analysing the sensor is performed on Finite Element Method by using COMSOL Multiphysics Software.