High contrast grating polarizer with adjustable polarization characteristics

A high contrast grating polarizer with adjustable polarization characteristics, comprising:

• a transparent substrate;
• and
• a plasma metal antenna structure layer, a refractive index electrically-tunable switching layer, a first electrode layer, and a second electrode layer located on the transparent substrate, wherein the first electrode layer and the second electrode layer are configured for applying an external voltage to switch polarization characteristics of the high contrast grating polarizer, wherein the refractive index electrically-tunable switching layer comprises a liquid crystal layer, wherein the plasma metal antenna structure layer comprises a high contrast grating and a plasma metal antenna structure interleaved with the high contrast grating, the high contrast grating comprises a semiconductor grating or a dielectric grating, the high contrast grating is used for transmitting light in a first polarization direction, wherein the plasma metal antenna structure is configured such that, in response to application of the external voltage, a refractive index change in the liquid crystal layer induces a phase mismatch that causes the plasma metal antenna structure to change from reflecting light in a second polarization direction to transmitting light in the second polarization direction, and wherein the first polarization direction is perpendicular to the second polarization direction.