Temperature-driven liquid crystal holographic encryption device, preparation method thereof and holographic decryption device

Abstract

The invention discloses a temperature-driven liquid crystal holographic encryption device, a preparation method thereof and a holographic decryption device. The liquid crystal holographic encryption device comprises a first substrate, a second substrate, a first rotation cholesteric liquid crystal layer and a second rotation cholesteric liquid crystal layer, a first orientation layer is arranged on one side of the first substrate, and a second orientation layer is arranged on one side of the second substrate; the screw pitch of the first turning cholesteric liquid crystal layer changes along with the temperature, the second turning cholesteric liquid crystal layer comprises a plurality of structural color areas, and in different structural color areas, the second turning cholesteric liquid crystal layer has different screw pitches; multi-wavelength laser is incident from one side of the first rotation cholesteric liquid crystal layer, and a holographic encrypted pattern is formed after the reflected light is diffracted. The liquid crystal holographic encryption device provided by the invention can be used for correctly decrypting only under the conditions of polarization analysis, specific temperature and specific wavelength, so that the encryption security is remarkably improved, and the limitations of low multiplexing dimension, poor flexibility and the like of the traditional optical encryption technology are effectively improved.

Images