Grating structure capable of generating space-time vortex light and preparation method thereof

Abstract

A grating structure capable of generating space-time vortex light and a preparation method thereof are provided. The grating structure is composed of multiple one-dimensional photonic crystal cells arranged periodically. The one-dimensional photonic crystal cell includes a high Si grating, a short Si grating and a SiO2 substrate, where the high Si grating and the short Si grating are arranged on the SiO2 substrate. Cross sections of the high Si grating and the short Si grating are both rectangular. A length of the one-dimensional photonic crystal cell is 400 nanometers (nm), a height of the high Si grating is 150 nm, a height of the short Si grating is 55 nm, and an interval between the high Si grating and the short Si grating is 50 nm.

Dependencies are inferred from the claim text.