Lin Zhining, Chen Shujing, Lin Chengyou
College of Mathematics and Physics, Beijing University of Chemical Technology, Beijing 100029, China.
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China.
Sensors (Basel). 2020 Apr 25;20(9):2445. doi: 10.3390/s20092445.
In this paper, we propose a surface plasmon resonance (SPR) sensor based on two-dimensional (2D) materials (graphene, MoS, WS and WSe) hybrid structure, and theoretically investigate its sensitivity improvement in the visible region. The thickness of metal (Au, Ag or Cu) and the layer number of each 2D material are optimized using genetic algorithms to obtain the highest sensitivity for a specific wavelength of incident light. Then, the sensitivities of proposed SPR sensors with different metal films at various wavelengths are compared. An Ag-based SPR sensor exhibits a higher sensitivity than an Au- or Cu-based one at most wavelengths in the visible region. In addition, the sensitivity of the proposed SPR sensor varies obviously with the wavelength of incident light, and shows a maximum value of 159, 194 or 155°/RIU for Au, Ag or Cu, respectively. It is demonstrated that the sensitivity of the SPR sensor based on 2D materials' hybrid structure can be further improved by optimizing the wavelength of incident light.
在本文中，我们提出了一种基于二维（2D）材料（石墨烯、MoS、WS和WSe）混合结构的表面等离子体共振（SPR）传感器，并从理论上研究了其在可见光区域的灵敏度提升。使用遗传算法对金属（金、银或铜）的厚度以及每种二维材料的层数进行优化，以获得特定波长入射光下的最高灵敏度。然后，比较了不同金属膜的所提出的SPR传感器在各种波长下的灵敏度。在可见光区域的大多数波长下，基于银的SPR传感器比基于金或铜的传感器具有更高的灵敏度。此外，所提出的SPR传感器的灵敏度随入射光波长明显变化，对于金、银或铜分别显示出159、194或155°/RIU的最大值。结果表明，通过优化入射光波长，可以进一步提高基于二维材料混合结构的SPR传感器的灵敏度。
