At the Japanese University of Utsunomiya, a prototype of a holographic display with a true three-dimensional image was developed, in which the working object is not light, but liquid. Let’s face it – humanity needs not an abstract floating picture in the air, but a real, applied gadget. For example, a massive screen with a 360º view, filled with a transparent substance.
The liquid that Japanese scientists have poured into the tank has a certain viscosity coefficient. If you shoot it from a laser with a femtosecond (one quadrillionth second) pulse, a group of bubbles forms at the desired point. Due to the high viscosity of the medium, they do not float up at once, but drift slowly, forming a structure for displaying the voxel – a three-dimensional pixel, the main element of the hologram.
The bubbles themselves imitate a tiny screen, on which you need to project light to obtain an image. They scatter it and the luminous voxel begins to visually stand out from the surrounding space. The rest of the technology – you just need to increase the number of light sources and develop an algorithm for step-by-step generation and lighting of bubbles for “drawing” an arbitrary picture. And given the fact that the lifetime of bubbles is small, the prospects for the implementation of interesting animation are opened.
In the working prototype, the size of the holographic “mermaid” is only a few millimeters, and the costs of maintaining complex lasers are frighteningly large. Expect that the technology will be realized in the form of a commercial retail product, like a home monitor, does not even have to happen in the near future. However, scientists are optimistic that their development may be of interest to generous customers. For example, exhibition centers, museums, universities or military.