Photothermal response of polymer microcantilever with metal coating in fluids

Cantilever beams are used as sensors in a great variety of applications. It is a promising research to study the vibration characteristics of microcantilever for biological and chemical detections. In this paper, a (a a) theoretical model was used to calculate the photothermal vibration frequency spectra of coating polymer microcantilever, which immersed in fluids and excited by an intensity-modulated laser beam. The comparison was made among the response of vibration in different fluids. Theoretical analysis demonstrated that a great distortion occurred to the vibration frequency spectra due to the high density and viscosity of liquids. In addition, it can be concluded from theoretical calculation that the coating has significant effect on the dynamic response of microcantilever.