However, today's holograms are limited in terms of quality because current SLM technology allows only a few low-resolution images to be projected onto sperate planes with low depth resolution. Credit: Lei Gong, University of Science and Technology of ChinaĬreating a dynamic holographic projection typically involves using a spatial light modulator (SLM) to modulate the intensity and/or phase of a light beam. The new 3D scattering-assisted dynamic holography approach creates a digital hologram by projecting high-resolution images onto planes spaced closely together (a), achieving a more realistic representation than conventional holography techniques (b). "Our approach could also improve holography-based optical encryption by allowing more data to be encrypted in the hologram." "Our new method overcomes two long-existing bottlenecks in current digital holographic techniques-low axial resolution and high interplane crosstalk-that prevent fine depth control of the hologram and thus limit the quality of the 3D display," said Gong. They show that it can achieve a depth resolution more than three orders of magnitude greater than state-of-the-art methods for multiplane holographic projection. Gong's team and Chengwei Qiu's research team at the National University of Singapore describe their new approach, called three-dimensional scattering-assisted dynamic holography (3D-SDH), in the journal Optica. This achieves high depth resolution, which is important for providing the depth cues that make the hologram look three dimensional. Producing a realistic-looking holographic display of 3D objects requires projecting images with a high pixel resolution onto a large number of successive planes, or layers, that are spaced closely together. It could also provide better 3D visuals without requiring a headset." "For virtual reality, our method could be used with headset-based holographic displays to greatly improve the viewing angles, which would enhance the 3D viewing experience. "A 3D hologram can present real 3D scenes with continuous and fine features," said Lei Gong, who led a research team from the University of Science and Technology of China.
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