Vanadium dioxide metasurfaces structures with infrared radiation protection properties

This paper presents a laser protection idea to form a two-dimensional subwavelength metasurfaces structure with phase-change vanadium dioxide (VO2) material. By using the phase change characteristics of VO2, the signal light can be focused to the infrared focal plane at room temperature, and VO2 undergoes a phase change under the action of a strong laser, which causes the spot on the focal plane to diverge, reducing the light intensity and energy density to protect the focal plane. The final imaging spot diameter of the metasurfaces designed in this paper is 4.4 mu m, which can intercept 76% of the incident energy from the outside after the phase change.