Using inks created from artificial materials that exhibit properties not found in nature (aka metamaterials) and commercially-available inkjet printers, researchers at the University of Utah have developed a way to create images only visible using polarized sub-millimeter electromagnetic waves. The researchers believe their new technique could be used to secretly conceal information in images that look normal to the naked eye, which could be useful in anti-counterfeiting or product authentication.
- University of Utah
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