Enhanced photonic spin Hall effect via singularity induced by destructive interference

In this work, we report a simple and effective method for enhancing the photonic spin Hall effect (SHE) via singularity induced by destructive interference in an ultrathin uniaxial slab. Deriving from anisotropy, the incident angles corresponding to destructive interference for p- and s-polarized waves will be deviated, leading to an enhancement peak in transverse spin shift. Interestingly, by adjusting the thickness of slab, the destructive interference and the Brewster effect can act together. At this point, the photonic SHE exhibits great singularity, and the maximum transverse spin shift can approach about three times more than that of the Brewster effect acting alone. This Letter reveals the influence of the interference effect on photonic SHE in layered media and provides a simple way to achieve enhanced photonic SHE. (C) 2021 Optical Society of America

Automated summary

This work presents a simple and effective method for enhancing the photonic spin Hall effect via singularity induced by destructive interference in an ultrathin uniaxial slab. By adjusting the thickness of the slab, the destructive interference and the Brewster effect can act together to significantly increase the maximum transverse spin shift. This research provides insights into the influence of interference effects on photonic spin Hall effect in layered media, offering a straightforward approach to achieve enhanced photonic SHE.