LAUSR

Conventionally, there is no lateral beam shift (LBS) at normal incidence for a wave beam pass through a slab. However, by simultaneously breaking spatial inversion, time-reversal, and mirror symmetries of the photonic crystal slab, we realized nonreciprocal LBS for the transmitted wave beam with high transmission. We showed that the nonreciprocal LBS could be positive or negative, which could be tuned by the arrangement of a magnetic basis in the unit cell. We verified the nonreciprocal LBS at normal incidence by experiments. Our study provides a useful way to manipulate the wave propagation and wave-matter interaction by artificial materials and leads to a breakthrough in LBS, which has promising potential in optical devices, such as transducers, switches, and unidirectional couplers.