Long-range surface plasmon resonance (LRSPR) sensors have been extensively studied by virtue of their extremely narrow full width at half maxima (FWHM) characteristics, but their low sensitivity remains an important factor limiting the figure of merit (FOM), making the sensors have difficulties in detecting small refractive index changes accurately. To address this problem, this paper proposes and demonstrates a low dimensional nanostructure (Au nanospheres, WS2) assisted LRSPR sensor to achieve an effective enhancement of the sensor interfaced electric field and thus improve the sensitivity. The performance parameters of the two sensors are compared with the LRSPR sensor by finite element method analysis, and the results showed that the assistance of the low dimensional nanostructure has a positive effect on the sensor. The first refractive index sensing experiment of the WS2-assisted LRSPR sensor was realized with a 25.47% increase in sensitivity and a 7.13% increase in FOM simultaneously, and the Au nanospheres-assisted LRSPR sensor with a 29.23% increase in sensitivity and a 15.95% increase in FOM simultaneously. The introduction of low dimensional nanostructures provides a flexible and effective means of sensitization for LRSPR sensors, making the plasmon resonance sensors combine high sensitivity, narrow FWHM and high FOM, which have promising applications in biochemical sensing.

中文翻译：

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具有高品质因数的低维纳米结构辅助长距离表面等离子体共振传感器


长距离表面等离子体共振（LRSPR）传感器凭借其极窄的半峰全宽（FWHM）特性而被广泛研究，但其低灵敏度仍然是限制品质因数（FOM）的重要因素，使得传感器难以准确检测微小的折射率变化。针对这一问题，本文提出并论证了一种低维纳米结构（Au纳米球，WS2）辅助LRSPR传感器，实现了传感器界面电场的有效增强，从而提高了灵敏度。通过有限元法分析将两种传感器的性能参数与LRSPR传感器进行比较，结果表明低维纳米结构的辅助对传感器具有积极的作用。首次实现了WS2辅助LRSPR传感器的折射率传感实验，灵敏度提高了25.47%，FOM同时提高了7.13%；Au纳米球辅助LRSPR传感器灵敏度提高了29.23%，FOM提高了15.95%。 FOM同时增加。低维纳米结构的引入为LRSPR传感器提供了灵活有效的敏化手段，使得等离激元共振传感器集高灵敏度、窄FWHM和高FOM于一体，在生化传感方面具有广阔的应用前景。