Postage-stamp-sized printed holograms

Researchers at CEA-Leti printed a pixelated hologram on a postage-stamp-sized component. The pixels, called “hoels”, are distributed across the entire surface. When illuminated by micro-laser sources, they reconstitute a coherent image on the retina. The innovation is targeting augmented reality glasses, where the hologram would be superimposed on the scene the wearer is looking at.
The hoels, which measure just a few microns in diameter, are etched into a transparent photopolymer made up of around a hundred 200-nm-thick layers with angular disparities. The researchers now plan to test other materials. The holographic image obtained is static. However, PhD research projects* currently underway are exploring how to activate and deactivate the hoels to make the image dynamic. A patent was filed to protect the innovation.

*In conjunction with the University of Haute Alsace in Mulhouse, France

Contact: christophe.martinez@cea.fr

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