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<p>The long-range surface plasmon resonance (LRSPR) has been studied by its narrow full width at half maximum (FWHM), but their less angular sensitivity with enhancement figure of merit (FoM) and imaging sensitivity (<i>S</i><sub>imag</sub>). For the enhanced performance parameters, we have proposed a structure utilizing a 2S2G prism, potassium fluoride (KF), silver (Ag), and a monolayer of molybdenum ditelluride (MoTe<sub>2</sub>) for the detection of acetone analyte. The proposed structure works on the principle of detecting a very small change in the refractive index (RI) of the acetone sample. The outcome demonstrates that the performance parameters have been improved. With a KF of 1200&#xa0;nm and an Ag thickness of 18&#xa0;nm, the FoM and imaging sensitivity of this LRSPR sensor are 737.68/RIU and 2772.1/RIU. Additionally, the penetration depths (PD) of 401.75&#xa0;nm and 712.85&#xa0;nm are obtained for the detection of the acetone RI of 1.34 and 1.368. This work’s novelty is the design and optimization of a MoTe<sub>2</sub>-assisted LRSPR sensor that uses a multilayer structure (KF, Ag, and MoTe<sub>2</sub>) and a high-index 2S2G prism to greatly improve the FoM over current SPR sensors. According to theoretical analysis, the suggested sensor will help detect chemical and biological substances in the visible region that fall within its detection range (1.34 to 1.368 RI).</p>

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Optimized Long-Range Surface Plasmon Resonance Sensor for High-Performance Acetone Detection

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • Rajeev Kumar,
  • Pushkar Praveen,
  • Agya Ram Verma,
  • Manoj Kumar,
  • Lalit Garia

摘要

The long-range surface plasmon resonance (LRSPR) has been studied by its narrow full width at half maximum (FWHM), but their less angular sensitivity with enhancement figure of merit (FoM) and imaging sensitivity (Simag). For the enhanced performance parameters, we have proposed a structure utilizing a 2S2G prism, potassium fluoride (KF), silver (Ag), and a monolayer of molybdenum ditelluride (MoTe2) for the detection of acetone analyte. The proposed structure works on the principle of detecting a very small change in the refractive index (RI) of the acetone sample. The outcome demonstrates that the performance parameters have been improved. With a KF of 1200 nm and an Ag thickness of 18 nm, the FoM and imaging sensitivity of this LRSPR sensor are 737.68/RIU and 2772.1/RIU. Additionally, the penetration depths (PD) of 401.75 nm and 712.85 nm are obtained for the detection of the acetone RI of 1.34 and 1.368. This work’s novelty is the design and optimization of a MoTe2-assisted LRSPR sensor that uses a multilayer structure (KF, Ag, and MoTe2) and a high-index 2S2G prism to greatly improve the FoM over current SPR sensors. According to theoretical analysis, the suggested sensor will help detect chemical and biological substances in the visible region that fall within its detection range (1.34 to 1.368 RI).