Non-specular reflection of light controlled by light

A theoretical manifestation of the controllable features of the uncommon resonant regime of the patterned silicon-on-metal metasurface is proposed involving the excitation of one additional diffraction order besides the main partial wave to reach a non-specular light reflection. As an attractive for applications, a Littrow scheme of double-ray resonant reflection by a periodic metasurface is investigated to provide a strong light-matter interaction controlled by light. We assume that the metasurface is constructed as an array of nonlinear silicon nanodisks located on a metal substrate. The excitation of a Mie-resonance that has a specific symmetry of field distribution used in mobile antennas is supposed. The ratio of values of non-specular and specular reflectance can be controlled by tuning the incident wave intensity.