Researchers achieve ultra-high-density three-dimensional dynamic holographic projection

Gong Lei’s research group, associate professor of the Department of Optics and Optical Engineering of the University of Science and Technology of China, collaborated with Professor Qiu Chengwei of the National University of Singapore and Professor Jinyang Liang of the National Academy of Sciences of the University of Quebec in Canada to propose a new method for ultra-high-density 3D holographic projection. The research team introduced light scattering into three-dimensional holographic projection technology, and at the same time overcame the two bottlenecks of the depth regulation of traditional holographic projection technology, and realized ultra-high-density three-dimensional dynamic holographic projection. On April 6, the research results were published online in the internationally renowned academic journal Optics.

Since Dennis Gabor invented holography in 1956, it has been believed that optical holography is the ideal way to achieve naked-eye 3D displays. However, the dynamic reconstruction of 3D holographic display of realistic stereoscopic scenes has always faced major challenges, among which generating realistic 3D holograms is the bottleneck problem. The real three-dimensional hologram involves the continuous and precise regulation of the depth information of the reconstructed object, the stronger the hologram depth information control ability, the higher the density of the effective projection plane, and the more realistic the reconstructed object image observed by the human eye. Dynamic holographic projection usually relies on spatial light modulators to modulate light field wavefront reconstruction object image information, but even with state-of-the-art spatial light modulators, the depth control ability of holograms currently generated is very limited. In addition, crosstalk between images at different depth planes further reduces the quality of holographic projection. Therefore, low depth resolution of projection planes and large image crosstalk between planes are two key limiting factors for producing realistic 3D holograms.

3D-SDH conceptual art for realistic 3D holographic projection. Photo courtesy of China University of Science and Technology

In this work, the researchers invented a scattering-assisted three-dimensional dynamic holography technology (3D-SDH). This technique uses the multi-scattering of light to greatly improve the range of spatial frequencies that can be controlled by the optical system, and at the same time develops the scattered light field transmission properties to reduce the correlation of different depth plane light fields, improves the projection depth resolution based on Fresnel holograms by more than 3 orders of magnitude, and greatly suppresses the crosstalk of images between different projection planes. In addition, the amplitude, phase and polarization information of the light field are coupled during the scattering process, and the scattering-assisted three-dimensional dynamic holography further realizes the three-dimensional dynamic polarization holographic projection by using a single digital hologram.

Comparison of the projection effect of scatter-assisted 3D dynamic holography technology (3D-SDH) and the most advanced 3D computational holography (RV-CGH) method. Photo courtesy of China University of Science and Technology

According to the researchers, scattering-assisted three-dimensional dynamic holographic technology can realize high-density, low-crosstalk, large-angle three-dimensional dynamic holographic projection, which can more realistically and dynamically reproduce three-dimensional stereoscopic scenes, and is used in virtual reality, projection lithography and information storage and other technical fields. (Source: Wang Min, China Science News)

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