Localization of light in 2D photonic Moiré superlattices

Abstract In this paper, monolayer photonic Moiré superlattices (PMSs) are constructed by superposing two periodic sublattices with square primitive cells and tunable twist angles. The sublattices are designed by interfering four umbrella-like beams. Light localization properties and physical flat-band effects of PMSs are studied by solving the Schrödinger equation in the periodic potentials. We have investigated the influence of interference angle and twist angle of sublattices on the localization of light and physical flat bands, and demonstrated that PMSs have physical flat bands and strong light localization properties when the twist angle is less than 5°, while the interference angle does not affect the flat-bands and localization properties. Our work provides a new research idea for manipulating spatial light fields and processing light information.