Highly Sensitive Multilayer Grating-Induced D-shaped Optical Fiber for SPR-based Opto-fluidic Sensing

IF 5.6 4区物理与天体物理 Q2 CHEMISTRY, PHYSICAL

Plasmonics Pub Date : 2026-07-21 DOI:10.1007/s11468-026-03405-0

Bishnu Daripa, Dipanjan Karmakar, Shyamal Mondal, Shyamal Das, Anirban Dhar

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引用次数: 0

Abstract

This study proposed a novel D-shaped optical fiber-based surface plasmon resonance (SPR) sensor for refractive index (RI) sensing, featuring a bimetallic (Ag-Au) layer integrated with a titanium oxide coating (TiO₂) and two different two-dimensional (2D) materials, namely, Molybdenum disulfide (MoS₂), and Graphene (GN). Surface plasmon waves are developed at the metal-dielectric surface when the evanescent field of the fiber mode excites the metal electrons under phase-matching conditions. Variations in the RI of the optofluidic medium are detected by monitoring shifts of the resonance absorption peaks. The architecture of D-shaped fiber is used to optimize the performance of the sensor through finite element method (FEM) to evaluate the key parameters such as the number of gratings, grating period, gap between two gratings, and residual cladding. The impact of the deposited layer thickness on sensor sensitivity is systematically investigated. A maximum 15,030 nm/ RIU sensitivity was achieved through this suggested design. The findings indicate that the multilayer grating-assisted structure provides 110% higher sensitivity than a conventional Ag-grated D-shaped fiber SPR sensor. The proposed sensor’s results highlight the potential for highly sensitive chemical and biochemical sensing, as well as future sensing applications.

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基于spr的高灵敏度多层光栅诱导d型光纤光流传感

本研究提出了一种用于折射率（RI）传感的新型d形光纤表面等离子体共振（SPR）传感器，其特征是双金属（Ag-Au）层与氧化钛涂层（TiO2）和两种不同的二维（2D）材料，即二硫化钼（MoS2）和石墨烯（GN）集成。当光纤模式的倏逝场在相位匹配条件下激发金属电子时，在金属介质表面产生表面等离子体波。光流体介质的RI变化是通过监测共振吸收峰的位移来检测的。利用d型光纤的结构，通过有限元法对光栅数、光栅周期、光栅间距、剩余包层等关键参数进行了优化。系统地研究了沉积层厚度对传感器灵敏度的影响。通过建议的设计，最大灵敏度达到15030 nm/ RIU。研究结果表明，多层光栅辅助结构的灵敏度比传统的ag光栅d形光纤SPR传感器高110%。所提出的传感器的结果突出了高灵敏度化学和生化传感的潜力，以及未来的传感应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Plasmonics 工程技术-材料科学：综合

CiteScore

5.90

自引率

6.70%

发文量

164

审稿时长

2.1 months

期刊介绍： Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons. Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.