Optical pressure exerted on a dielectric film in the evanescent field of a Gaussian beam

We theoretically investigate the optical pressure for a dielectric film located in the evanescent field of a Gaussian beam. in our approach, we derive the electromagnetic fields at the boundaries of the film by solving the boundary-value problem for a system of four stratified media with the incidence of a Gaussian beam. We also formulate analytically the optical pressure exerted on a dielectric film by using the derived electromagnetic fields. Numerical results of the optical pressure by a Gaussian beam-generated evanescent wave are presented in comparison with the plane-wave results.