石墨烯纳米带修饰微悬臂梁的光热偏转特性研究

With the advantages of strong selectivity, high detection accuracy and high respond speed, photothermal cantilever deflection spectroscopy possesses a wide range of applications in environmental monitoring, bio-medical treatment and chemical analysis fields. To address the low absorbance of the traditional bimaterial cantilever, a method exploring the surface plasmons in graphene nanoribbon is proposed to improve the photothermal deflection sensitivity of the microcantilever. First, an optical model of the cantilever is built based on the finite element method. The absorbance of the cantilever can be improved to 100% by optimizing the structure parameters of the graphene nanoribbon and the cantilever. Second, the thermodynamic model of the cantilever is also built employing Ansys software, and the influence of the laser parameters on the photothermal deflection characteristics of cantilever is investigated. Simulation results show that the sensitivity of the graphene nanoribbon decorated cantilever is 5 times larger than that of the traditional bimaterial cantilever.