A new way to create compact holograms is developed by scientists to work across the spectrum of light and may improve protection against fraud as well as entertainment displays. Credit cards, drivers licenses etc from are protected from fraud using these holograms. Not only these grocery store scanners and biomedical devices are also protected.

For decades, the researchers are using this holographic technology and trying to find the compact holograms more complex and secure. A programme is held by the researchers at Harward University in Us into compact holograms.

To produce different images depending on the polarisation of incident light these holograms are sensitive and use nanostructures. The spectrum of light improves anti-fraud holograms as well as those found in entertainment displays.

“The novelty in this research is that by using nanotechnology, we’ve made holograms that are highly efficient, meaning that very little light is lost to create the image,” said Federico Capasso, Professor at Harvard.

“By using incident polarised light, you can see far a crisper image and can store and retrieve more images,” said Capasso.

“Polarisation adds another dimension to holograms that can be used to protect against counterfeiting and in applications like displays,” he said.

Digital photographs capture a field of light around an object which should be encoded into a chip. Holograms are helpful for capturing photographs and record the intensity of light.

“Our holograms work like any other but the image produced depends on the polarisation state of the illuminating light, providing an extra degree of freedom in design for versatile applications,” said a postdoctoral fellow in the Capasso Lab Mohammadreza Khorasaninejad.