innovation for industry
What if tomorrow holograms could be displayed on augmented reality glasses? CEA-Leti has achieved a major step towards this goal by printing pixelated holograms on a postage stamp format component (6 x 6 mm²).
Augmented Reality (AR) glasses allow us to observe a real scene, while viewing additional information relevant to the scene: explanatory text, instructions, diagrams, photos, etc. CEA-Leti's ambition is to use holograms, i.e. volumetric optical components, in micro- and nano-photonic manufacturing processes for AR applications and beyond.To avoid reducing the visual field, these holograms must be displayed in an approximately postage stamp size area, i.e. a few tens of mm2.
More specifically, this involves printing on this surface holographic pixels or "hoels" to reconstruct a coherent image in the back of the eye, when illuminated by laser microsources. This technological challenge has now been met.
In practice, we print these hoels, several microns in diameter, within a 16 micron thick transparent photopolymer volume using a 532 nm laser", explains Christophe Martinez, manager of CEA-Leti's Retina Projection Program. "The holographic effect is obtained by engraving them on around a hundred, 200 nm layers featuring angular disparities. The writing process is totally repeatable to control hoel size, period and pitch.
CEA-Leti Contact : Christophe Martinez
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.