Taking into account the amount of research and achievements in this direction, holographic three-dimensional displays should become a fairly ordinary thing in the very near future. One of these achievements is the work of researchers from the University of Sussex (University of Sussex), who have developed a technology for creating animated 3D holograms that are not only visible from any angle, they can also be heard and even touched. All this makes us one step closer to the practical implementation of holographic technologies, known so far for such science fiction films as Star Wars and Star Trek.
Researchers from the United Kingdom used a method very similar to the method previously implemented by researchers from Brigham Young University, Utah, USA. At one time, American researchers using laser light, invisible to the human eye, raised and controlled the position of small particles in space. These particles were selectively illuminated with light of various colors, which created the effect of a 3D image. British researchers, in their work, used two of the same goals, two matrices of ultrasonic emitters, and two-millimeter diameter light polystyrene beads were used as three-dimensional “pixels” of their holographic display.
Due to the very small mass of polystyrene beads, they, under the influence of waves from ultrasonic emitters, can move at a speed of just over 30 kilometers per hour. The working space of the holographic display is a cube with an edge of 10 centimeters, one bead is able to move through the entire working space in a tenth of a second, which is very fast so that the human eye can see such a rapid movement. Since the beads are real objects moving in real three-dimensional space, they create a real 3D image, not a two-dimensional one, which turns into a pseudo-three-dimensional by optical illusion. And such real 3D holograms will be clearly visible from any angle of view without affecting the effect created.
This technology is not limited to creating only a high-quality visual effect. Ultrasonic emitters can cause the beads to oscillate in the range of sound frequencies, which creates sound waves heard by the human ear. The synchronized vibrations of all beads turn them into a kind of speaker cone, capable of reproducing fairly clear speech and simple music.
But the sound effect of the new holographic display is not everything. The same ultrasonic emitters are capable of operating in the frequency range that ensures the occurrence of pressure drops, which can be felt by bringing your hands closer in the hologram area. This, in turn, will allow the creation of new holographic interfaces that provide feedback to the user, giving him the sensation of touch and simulate the texture of a virtual holographic surface.
Unfortunately, this ultrasonic holographic technology is very far from being embodied as a consumer-grade end device. To create such devices will require something more advanced, for example, the technology of creating some kind of force field, which so far has not even “loomed on the horizon.” Nevertheless, the development of this technology is another step towards the fact that someday it will replace the current glasses and helmets of virtual reality, which, frankly, are not very convenient to use.