Kong Lu, Lv Jiangtao, Gu Qiongchan, Ying Yu, Jiang Xiaoxiao, Si Guangyuan
College of Control Engineering, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China.
College of Information Science and Engineering, Northeastern University, Shenyang 110004, China.
Nanomaterials (Basel). 2020 Oct 26;10(11):2125. doi: 10.3390/nano10112125.
A novel surface plasmon resonance (SPR) sensor with graphene and subwavelength gratings is proposed to improve the sensing performance. A series of numerical analyses were performed to investigate the effect of structural parameters on the sensing performance, such as minimum reflectance at resonance (MRR), full width at half maximum (FWHM), and resonance angle. The results indicated that near-zero MRR (2.9 × 10) and narrow FWHM (about 3.5 deg) could be obtained by optimizing the geometrical parameters. Moreover, the influence of the number of graphene layers on sensitivity was also studied. The maximum sensitivity of the designed sensor could reach 192 deg/refractive index unit (RIU), which is a great enhancement compared to the silver-only SPR sensor. In addition, ethylene glycol solutions with different refractive indices were detected. The results showed that the sensitivity of the sensor could reach 220.67 deg/RIU, and the proposed sensor had excellent linearity between the resonance angle and refractive index, enabling extensive potential practical sensing applications.
提出了一种具有石墨烯和亚波长光栅的新型表面等离子体共振（SPR）传感器，以提高传感性能。进行了一系列数值分析，以研究结构参数对传感性能的影响，如共振时的最小反射率（MRR）、半高宽（FWHM）和共振角。结果表明，通过优化几何参数可以获得接近零的MRR（2.9×10）和较窄的FWHM（约3.5度）。此外，还研究了石墨烯层数对灵敏度的影响。所设计传感器的最大灵敏度可达192度/折射率单位（RIU），与仅含银的SPR传感器相比有很大提高。此外，对不同折射率的乙二醇溶液进行了检测。结果表明，该传感器的灵敏度可达220.67度/RIU，且所提出的传感器在共振角和折射率之间具有出色的线性关系，具有广泛的潜在实际传感应用。
