Highly sensitive surface plasmon resonance (SPR) sensor consisting of Ag-Pt bimetallic films sandwiched with 2D materials black phosphorus (BP) and graphene over Pt layer in Kretschmann configuration is analyzed theoretically using the transfer matrix method. Numerical results show that upon suitable optimization of thickness of Ag-Pt layers and the number of layers of BP and graphene, sensitivity as high as 412°/RIU (degree/refractive index unit) can be achieved for p-polarized light of wavelength 633 nm. This performance can be tuned and controlled by changing the number of layers of BP and graphene. Furthermore, the addition of graphene and heterostructures of black phosphorus not only improved the sensitivity of the sensor but also kept the FWHM of the resonance curve much smaller than the conventional sensor utilizing Au as plasmonic metal and hence improved the resolution to a significant extent. We expect that this new proposed design will be useful for medical diagnosis, biomolecular detection, and chemical examination.

使用转移矩阵方法从理论上分析了高灵敏度表面等离子体共振 (SPR) 传感器，该传感器由夹在 Kretschmann 配置的 Pt 层上的二维材料黑磷 (BP) 和石墨烯组成的 Ag-Pt 双金属膜。数值结果表明，通过适当优化Ag-Pt层的厚度和BP和石墨烯的层数，对波长为633的p偏振光的灵敏度可以达到412°/RIU（度/折射率单位）纳米。这种性能可以通过改变 BP 和石墨烯的层数来调整和控制。此外，石墨烯和黑磷异质结构的加入不仅提高了传感器的灵敏度，而且使共振曲线的 FWHM 比使用 Au 作为等离子体金属的传统传感器小得多，从而显着提高了分辨率。我们预计这种新提出的设计将有助于医学诊断、生物分子检测和化学检查。