Fabrication of DOE and applications in 3D optical storage and encryption. (IMAGE)
Caption
(A) SEM image and a zoom-in view of a fabricated DOE. (B) Simulated intensity distribution at the Fourier plane of the DOE; inset: the encoded smiley. (C) Image recorded from the fabricated DOE in (A). The 0th order is spatially blocked to avoid camera damage. (D) Schematic of the optical setup to record the encoded image. (E-G) Demonstration of optical storage and encryption: (E) an expanded hydrogel patterned with designed information; (F) the gel in (E) after fully shrinking and dehydration to realize physical encryption; (G) the re-expanded gel is deposited with CdSe and developed to decrypt the stored patterns. (H) Optical image showing two encrypted 7-layer hologram patterns in (F). (I) Fluorescent images of the decrypted holograms, where “Science” is decoded; and (J, K) 3D views of the decrypted holograms.
Credit
Chinese University of Hong Kong
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