Electric and magnetic tuning of the Goos-Hänchen shift of a light beam upon reection from a magneto-electric heterostructure

摘要

We investigate theoretically the Goos-Hänchen shift of a Gaussian light beam reflected from a magneto-photonic heterostucture consisting of an electrooptic film, a magneto-electric film, and a nonmagnetic dielectric substrate. We show that the magneto-electric coupling increases up to several times the amplitude of the Goos-Hänchen shift of a p-(s-) polarized incident beam reflected into a s-(p-) polarized beam. Tuning of the magnetization in the magnetic film leads to a nonreciprocal sign change of the lateral shift, and tuning of the shift amplitude can be achieved through a judicious choice of the magnitude and direction of an external dc electric field applied to the system.