含弱吸收介质界面处透射束Goos-Hanchen位移研究

We study the Goos-Hanchen effect of transmitted beams at the interface between air and weakly absorbing medium. It is found that, a lateral shift occurs when the beam travels through the interface, which is disagree with the geometrical optic prediction according to Snell's law of refraction. Considering plane wave incident from air to absorbing positive medium and negative medium, respectively, we obtain the analytical expression of the shift of transmitted beams by using stationary phase methods. The influence of permittivity and magnetic permeability on the lateral shift is discussed.