Holograms projected on a white screen while changing the wavelength of light from blue to red. (Image courtesy of the Capasso Lab)
Nanotechnology improves holographic capabilities by encoding light polarization. Holograms are a ubiquitous part of our lives. They are in our wallets — protecting credit cards, cash and driver’s licenses from fraud — in grocery store scanners and biomedical devices. Even though holographic technology has been around for decades, researchers still struggle to make compact holograms more efficient, complex and secure.
Researchers at the Harvard John A. Paulson School of Engineering and Applied Sciences have programmed polarization into compact holograms...
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