Growing concern about data theft and counterfeiting has inspired increasingly sophisticated security technologies, like hologram seals, that can help verify the authenticity of currency, passports and other important documents. However, as security technologies evolve, so do the techniques criminals use to get past them.
To stay one step ahead of these bad actors, researchers report that they have developed a new photopatterning technique that creates two light-reactive images on one material.
Previous research teams have struggled to manufacture similar"dual-mode" films, where two patterns can be separately stored and separately viewed, because producing the second image often damages the quality of the first one. To prevent this interference, Lang Qin, Yanlei Yu and colleagues from Fudan University created two different types of images -- a polarization pattern and a structural pattern -- within the same film.
Under ordinary light, the resulting film showed the FDU letters as the light reflected off the structural image. Then the film revealed the university's seal when polarized light shone through it. Because both images are created without chemically changing the material's molecular structure, the film has the added benefit of being rewritable, allowing the user to pattern new images when needed.
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