Holograms are often depicted in science fiction as beautiful, life-size projections. But what seems like the technology of the future is actually the technology of the present, and now it is being used to Creating a Mona Lisa hologram.
In Applied Physics Reviews, by AIP Publishing, researchers from Tianjin University, Beijing Institute of Technology, Rowan University, University of Missouri, Qingdao University, Shijiazhuang Tiedao University and Beijing Jiaotong University have developed a metasurface-based holography system that uses deep learning. An algorithm to create and enhance the Mona Lisa hologram.
A hologram is an image created by recording and reconstructing the interference patterns of light or sound waves. They provide a truly immersive visual experience and can be applied to entertainment, medical imaging and communications, among other areas. Metasurfaces, or two-dimensional materials composed of a network of small antenna-like elements, can greatly aid the holography process.
“The metasurface-based hologram works by precisely controlling the direction and amplitude of the waves interacting with the metasurface,” said author Yue-Sheng Wang. “As a result, the waves emitted from each pixel reflect a certain amplitude and frequency, resulting in a desired holographic image based on their interference.”
The team wanted to develop a method for improving the holography of metasurfaces to improve efficiency and accuracy. They used algorithms based on deep neural networks to design antenna-like elements in their metasurface. By gradually reducing the overlap between the original image and the holographic image, they modified the metasurface and created a high-resolution hologram.
“We chose to recreate the Mona Lisa as a proof of concept,” Wang said. “He is so famous that almost everyone knows him. It is filled with a lot of soft and smooth transitions of the fabric, which increases the smoothness, fuzziness and mystery of the painting. So it’s a great way to demonstrate the effectiveness of our system.
The holographic technique reconstructed the Mona Lisa in detail and, in more detail, her left eye. Although the Mona Lisa hologram is two-dimensional, the process can also be extended to create a three-dimensional image.
“The precise control of sound waves provided by our holography system is critical for promoting non-invasive medical treatment, effective noise control, and the enhancement of musical environments such as concert halls,” Wang said. . “These improvements can improve quality of life and a variety of technological applications.”
The authors believe that their method could revolutionize the field of holography. They plan to explore ways to assemble it, make it compatible with 3D printing, and reduce training time.
Source: American Institute of Physics
