(a) Scheme of the Spin Hall Effect (SHE) of light in hyperbolic metamaterials. The incidence angle, indicated by θ_i, switches the transverse beam shift along the y-axis denoted as . The HMM structure’s unit cell is made up of Al₂O₃(10 nm)–APTMS(1 nm)–Au(10 nm)–APTMS(1 nm). Eight periods totaling 176 nm in thickness make up the HMM. (b) According to the effective media approximation, the effective permittivities of a multilayer HMM structure made up of a unit cell of Al₂O₃(10 nm)–APTMS(1 nm)–Au(10 nm)–APTMS(1 nm) were calculated. The structure exhibits type II (ϵ_o < 0 and ϵ_e > 0) HMM behavior in the visible wavelength range. The vertical dashed lines indicate the wavelengths λ = 520 nm and 633 nm at which experiments were conducted. Measured and calculated spin Hall transverse shifts for (c) λ = 633 nm and (d) λ = 520 nm, respectively, are shown in solid lines. Beam waist wo is fitted to the simulation results in (a) and (b). Note that there is an estimated beam divergence of Δθi = 0.01 rad for λ = 633 nm and Δθi = 0.02 rad for λ = 520 nm indicated as lateral error bars, respectively. Further details are in the text