Enhancement Goos–Hänchen shift in flatland hyperbolic metamaterials

In recent years experimental measurement of photonic spin Hall effect of metasurfaces has shown significant progress. This study investigates lateral Goos-Hänchen (GH) and transverse Imbert-Fedorov (IF) shifts of differently polarized light beams totally reflected from flatland hyperbolic metasurfaces that support hyperbolic phonon polaritons. Position and width of the isofrequency tunability of the hyperbolic phonon polariton (HPP) modes demonstrate the comparison of rotation of the metamaterial with that of infinite thickness. As a result, the GH-shift and IF-shift both show larger shifts that can be adjusted from the near to mid-infrared spectral region within and out of the natural Reststrahlen band. Further, we demonstrate the mechanism to obtain maximum values of shifts by changing the geometrical shape, filling factor of the flatland metamaterial, and the incidence angle of the light. The theoretical results obtained offer an alternative platform in designing new metasurfaces for nano-optical devices applications.