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<p>In this seminal work, we propose a novel-guided wave long-range surface plasmon resonance (GW-LRSPR) sensor. The multilayer sensor structure combines 2S2G prism, cytop, BaTiO<sub>3</sub>, and silver (Ag). The inclusion of barium titanate (BaTiO<sub>3</sub>: perovskite material), a material with high permittivity and piezoelectric properties, significantly enhances the imaging sensitivity (<i>S</i><sub>imag</sub>) of the proposed GW-LRSPR sensor as it allows for the tuning of the plasmonic response through electrical or mechanical stimuli. Additionally, the use of a Cytop layer as an insulating and protective dielectric layer further enhances the sensor’s durability and optical performance. By incorporating the BaTiO<sub>3</sub> layer, the sensor achieves a maximum <i>S</i><sub>imag</sub> of 73,031&#xa0;RIU<sup>−1</sup>, significantly higher than the 44,542&#xa0;RIU<sup>−1</sup> obtained without the layer. Hence, the GW-LRSPR sensor demonstrated strong capability in analyte detection. The sensor also exhibits a figure of merit (FoM) of 7.3 × 10<sup>6</sup>&#xa0;RIU<sup>−1</sup>, with detection accuracies (DA) of 169.49/° and 185.18/° for the LRSPR and GW-LRSPR sensors, respectively. Overall, the proposed GW-LRSPR sensor improves imaging sensitivity by nearly 64% compared to the LRSPR sensor.</p>

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Optimized dielectric-plasmonic interfaces for long-range surface plasmon resonance sensors

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Rajeev Kumar,
  • Shivam Singh,
  • Rachana Arya,
  • Mayank,
  • Abdullah Saad Alsubaie,
  • Amrindra Pal,
  • Arshdeep Singh,
  • Lalit Garia

摘要

In this seminal work, we propose a novel-guided wave long-range surface plasmon resonance (GW-LRSPR) sensor. The multilayer sensor structure combines 2S2G prism, cytop, BaTiO3, and silver (Ag). The inclusion of barium titanate (BaTiO3: perovskite material), a material with high permittivity and piezoelectric properties, significantly enhances the imaging sensitivity (Simag) of the proposed GW-LRSPR sensor as it allows for the tuning of the plasmonic response through electrical or mechanical stimuli. Additionally, the use of a Cytop layer as an insulating and protective dielectric layer further enhances the sensor’s durability and optical performance. By incorporating the BaTiO3 layer, the sensor achieves a maximum Simag of 73,031 RIU−1, significantly higher than the 44,542 RIU−1 obtained without the layer. Hence, the GW-LRSPR sensor demonstrated strong capability in analyte detection. The sensor also exhibits a figure of merit (FoM) of 7.3 × 106 RIU−1, with detection accuracies (DA) of 169.49/° and 185.18/° for the LRSPR and GW-LRSPR sensors, respectively. Overall, the proposed GW-LRSPR sensor improves imaging sensitivity by nearly 64% compared to the LRSPR sensor.