We investigate a high-sensitivity plasmonic sensor that uses a hexagonal nanorod array metasurface with for identifying malignant hepatic metastases from healthy liver cells. This designed plasmonic metasurface has some advantages such as nanoscale dimensions, a high figure of merit and sensitivity to the refractive index, and insensitivity to the incident angle for 0° to 60°. With the 3D finite-difference time domain method, we study the output characteristics and the effect of geometrical parameters, materials, and incident angle on the plasmon-induced absorption resonances as well. A sensitivity of 1250 nm per refractive index unit (RIU) can be achieved when the change of the sensing medium refractive index Δn=0.2, and the maximum figure of merit achieved is about 610 RIU⁻¹. Also, graphene metasurfaces are used to obtain tunable characteristics. Our proposed structure not only has a nanoscale footprint of 200×200×50 nm³, but also its plasmon-induced absorption resonances are not sensitive to the incident angle. This device holds great potential for the design of nanosensor devices and perfect absorbers.

我们研究了一种高灵敏度的等离子体传感器，该传感器使用六边形纳米棒阵列亚表面，用于从健康的肝细胞中识别恶性肝转移。这种设计的等离子超表面具有一些优势，例如纳米级尺寸，高品质因数和对折射率的敏感性以及对0°至60°的入射角不敏感。借助3D时域有限差分法，我们还研究了输出特性以及几何参数，材料和入射角对等离激元诱导的吸收共振的影响。当感测介质折射率Δn = 0.2的变化时，可以获得每折射率单位（RIU）1250 nm的灵敏度，并且获得的最大品质因数约为610 RIU ^-1。同样，石墨烯超表面被用于获得可调特性。我们提出的结构不仅具有200×200×50 nm ³的纳米级足迹，而且其等离子体激元诱导的吸收共振对入射角也不敏感。该器件在纳米传感器器件和完美吸收体的设计方面具有巨大潜力。