Spin-dependent temporal splitting of light: A temporal photonic spin Hall effect

초록

We propose a theoretical model to investigate the temporal photonic spin Hall effect (TPSHE). The considered configuration consists of a three-layer structure comprising two dielectric media with distinct permittivities. An analytical expression for the TPSHE-induced temporal shift is derived as a function of the incident angle and angular frequency. The resulting group delay is analyzed for both conventional dielectric materials and epsilon-near-zero (ENZ) metamaterials. Our results demonstrate that ENZ metamaterials significantly enhance the spin-dependent temporal response owing to their near-zero wave-vector characteristics. In particular, the incorporation of ENZ media enables a pronounced suppression of the group delay, reaching values as small as 10-9s in the microwave regime. The novelty of this work lies in presenting a unified analytical framework for describing TPSHE across different spectral regimes and in clarifying the critical role of ENZ metamaterials in enabling compact, tunable, and ultrafast temporal spin control. These findings open promising prospects for the development of ENZ-based temporal photonic devices and spin-dependent signal processing in advanced photonic systems.

키워드