  Photonic structures offer unique opportunities for controlling light-matter
interaction, including the photonic spin Hall effect associated with the
transverse spin-dependent displacement of light that propagates in specially
designed optical media. However, due to small spin-orbit coupling, the photonic
spin Hall effect is usually weak at the nanoscale. Here we suggest
theoretically and demonstrate experimentally, in both optics and microwave
experiments, the photonic spin Hall effect enhanced by topologically protected
edge states in subwavelength arrays of resonant dielectric particles. Based on
direct near-field measurements, we observe the selective excitation of the
topological edge states controlled by the handedness of the incident light.
Additionally, we reveal the main requirements to the symmetry of photonic
structures to achieve a topology-enhanced spin Hall effect, and also analyse
the robustness of the photonic edge states against the long-ranged coupling.
