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The photonic spin Hall effect in structures with surface plasmon resonance has great potential for various polarization-sensitive applications and devices. A theoretical and experimental study of the photonic spin Hall effect in subwavelength diffraction gratings is carried out. Using polarimetric and optimized weak measurements methods, the photonic spin Hall effect, enhanced by surface plasmon resonance, is demonstrated, which manifests itself in the spatial separation of circularly polarized photons with opposite spin signs when a laser beam is reflected from the grating surface. The effect of the polarization state of the incident laser radiation and the grating material on the angular displacement of the reflected beam is investigated. It is demonstrated that the angular shift can be changed from a spin-independent (Goos–Hanchen shift) to a spin-dependent photonic spin Hall effect when the polarization state of the incident beam changes. It is shown that the polarization states of incident radiation, at which the photon spin Hall effect is observed in nickel and silver gratings, differ significantly.
Petrov et al. (Sat,) studied this question.