Reflection of two-dimensional surface polaritons by metallic nano-plates on atomically thin crystals

Abstract Owning to their unusual optical properties, such as electrical tunability and strong spatial confinement, two-dimensional surface polaritons (2DSPs) hold great promise for deep sub-wavelength manipulation of light in a reduced low-dimensional space. Control 2DSPs is possible by using interaction with boundary between two media, similar how behaves three-dimensional (3D) The understanding the 2D case still its early stages, unlike 3D case, in-depth investigations are only available few cases including structured crystals. Here, we extend scope our metallic nano-plates on crystals, focusing reflection 2DSPs. Through rigorous model, reveal that, strongly confined having much larger momentum than free space photons, results almost total internal radiative coupling negligible. We also find that involves an anomalous phase shift dependent thickness nano-plate, due temporary storing electromagnetic energy evanescent waves induced near edge nano-plate. Our theory predicts saturates value, 0.885 π , nano-plate becomes thicker. work provides detailed manipulate one simplest nanostructures, essential further development nanostructure-integrated devices polariton optics.