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"Invisible" images created with off-the-shelf inkjet printers

Hidden images (H) are only visible (V) when viewed under the correct polarization and terahertz frequency

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.

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Category: Science

Tags:
  • University of Utah
  • Metamaterials
  • OSA
  • Invisible
  • Inkjet
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This post first appeared on High Technal News, please read the originial post: here

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"Invisible" images created with off-the-shelf inkjet printers

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