In this study, we developed a simple hybrid structure and an appropriate numerical analysis method for a prism-based surface plasmon refractive index biosensor by using an angular interrogation method. The proposed sensor comprised a prism filled with a hybrid of gold (Au), alpha tin selenide (α-SnSe), and graphene, and a sensing medium. Monolayers of α-SnSe with a similar structure to graphene and phosphorene have exceptional optoelectronic properties and they have attracted much attention as two-dimensional (2D) materials in a similar manner to other 2D material family members. The performance parameters were determined in terms of the sensitivity, detection accuracy (DA), and quality factor (QF). The results demonstrated the improved overall performance of the proposed sensor. Inserting an α-SnSe layer between gold and graphene increased the sensitivity of the sensor, and its sensitivity was higher than those of previously reported sensors. All of the performance parameters were enhanced for this hybrid sensor, which is not possible with sensors based only on graphene. Increasing the number of graphene-only layers improved the sensitivity but decreased the DA and QF. The effect of the electric field distribution on the inserted graphene layers was analyzed with the finite difference time domain (FDTD) technique using Lumerical FDTD solution commercial software. The proposed biosensor may facilitate novel sensing applications.

在这项研究中，我们开发了一种简单的混合结构和适当的数值分析方法，用于通过使用角询问法的基于棱镜的表面等离激元折射率生物传感器。拟议中的传感器包括一个装有金（Au），α硒化锡（α-SnSe）和石墨烯的混合物的棱镜，以及一种传感介质。具有与石墨烯和磷光体相似结构的α-SnSe单层具有出色的光电性能，它们作为二维（2D）材料以与其他2D材料族成员相似的方式引起了人们的广泛关注。根据灵敏度，检测精度（DA）和品质因数（QF）确定性能参数。结果证明了所提出传感器的整体性能得到改善。在金和石墨烯之间插入一个α-SnSe层可以提高传感器的灵敏度，并且其灵敏度高于以前报道的传感器。此混合传感器的所有性能参数均得到增强，而仅基于石墨烯的传感器则无法实现。增加仅石墨烯的层数可提高灵敏度，但会降低DA和QF。使用Lumerical FDTD解决方案商用软件，通过时差有限时域（FDTD）技术分析了电场分布对插入的石墨烯层的影响。提出的生物传感器可以促进新颖的传感应用。仅基于石墨烯的传感器无法做到这一点。增加仅石墨烯的层数可提高灵敏度，但会降低DA和QF。使用Lumerical FDTD解决方案商用软件，通过时差有限时域（FDTD）技术分析了电场分布对插入的石墨烯层的影响。提出的生物传感器可以促进新颖的传感应用。仅基于石墨烯的传感器无法做到这一点。增加仅石墨烯的层数可提高灵敏度，但会降低DA和QF。使用Lumerical FDTD解决方案商用软件，通过时差有限时域（FDTD）技术分析了电场分布对插入的石墨烯层的影响。提出的生物传感器可以促进新颖的传感应用。