Martes, 25 Setiembre, 2018

Thinnest hologram ever may lead to '3D world'

Credit RMIT University via You Tube  MANILA BULLETIN Credit RMIT University via You Tube MANILA BULLETIN
Irune Rengel | 19 May, 2017, 18:36

Researchers at RMIT have created what they claim to be the world's thinnest hologram.

Interactive holograms appear constantly in science fiction, but in practice it has proved hard for scientists to reduce them so that they can work with modern electronics.

The nano-hologram has a thickness of only 25 nanometers (billionths of a meter), it is 1,000 times thinner than a human hair and can be observed without special 3D glasses.

Researchers at the Australian University of RMIT and the Beijing Institute of Technology, headed by Professor Minh Gou, published the publication in Nature Communications.

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"Conventional computer-generated holograms are too big for electronic devices but our ultra-thin hologram overcomes those size barriers", he said.

Holograms are three-dimensional images created by the interactions of laser lights, and appear to have more depth than images formed from lenses. "Our nano-hologram is also fabricated using a simple and fast direct laser writing system, which makes our design suitable for large-scale uses and mass manufacture". But to generate enough phase shifts, those holograms need to be at the thickness of optical wavelengths.

Their topological insulator material has a low refractive index in its surface layer but an ultrahigh refractive index throughout, so acts as an "intrinsic optical resonant cavity".

As the Minh Gou said, "incorporating nano-holograms into everyday electronics will make irrelevant the size of the screen, since a 3D hologram will emerge and display a wealth of information that does not fit on a phone or clock screen".

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"From medical diagnostics to education, data storage, defence and cyber security, 3D holography has the potential to transform a range of industries and this research brings that revolution one critical step closer", says Gu.

The next step for the scientists is making a film that can be laid onto any LCD screen to create a 3D holographic display.

"Beyond that we are looking to create flexible and elastic thin films that could be used on a whole range of surfaces, opening up the horizons of holographic applications".

So, how long before our smartphones get 3D display capabilities? Gu says that would depend on money matters. "If there's a proper partner, in five years' time we could see some real products".

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