Spin-dependent phenomena at chiral temporal interfaces

Abstract Temporally varying electromagnetic media have been extensively investigated recently to unveil new means for controlling light. However, spin-dependent phenomena in such not explored thoroughly. Here, we reveal the existence of at a temporal interface between chiral and dielectric media. In particular, show theoretically numerically that due material discontinuity time, linearly polarized light is split into forward-propagating right-handed left-handed circularly waves having different angular frequencies same phase velocities . This salient effect allows complete separation two spin states with high efficiency. addition, phenomenon gain/loss observed. Furthermore, when medium switched back original medium, right- (with frequencies) merge form wave. Our findings extend interactions from space space-time.