Nonlinear perfect vector beam generation element, preparation method and application thereof

A nonlinear perfect vector beam generation element, wherein the nonlinear perfect vector beam generation element comprises a first glass substrate, a first photoalignment layer, a ferroelectric nematic liquid crystal layer, a second photoalignment layer, and a second glass substrate;

• wherein the first glass substrate and the second glass substrate are arranged oppositely;
• the first photoalignment layer and the second photoalignment layer are respectively disposed on inner sides of the first glass substrate and the second glass substrate;
• and spacer particles are arranged between the first photoalignment layer and the second photoalignment layer;
• and
• wherein the first photoalignment layer and the second photoalignment layer are provided with a nonlinear perfect vector beam control pattern;
• the nonlinear perfect vector beam control pattern controls liquid crystal molecules in the ferroelectric nematic liquid crystal layer to exhibit a concentric ring alignment distribution of a plurality of periods;
• and a ferroelectric nematic liquid crystal material of the ferroelectric nematic liquid crystal layer is a ferroelectric nematic liquid crystal material comprising an intermediate polar phase.