Holograms have been a staple of science-fiction for decades yet they are commonly misrepresented in popular culture. According to physics, a hologram is a photographic recording of how light scatters from an object that can be displayed in a manner that appears three-dimensional. So when R2-D2 projects Princess Leia ‘s message in the original Star Wars movie, it technically is not a hologram because it could be viewed from any orientation. What it is is a visual representation of an object in three physical dimensions known as a volumetric display.
Researchers at Brigham Young University have created a volumetric display system that uses photophoretic optical trapping to produce three-dimensional color graphics. Photophoresis is a phenomenon that allows small particles in air to be captured and precisely moved using a laser. As the particle is rapidly scanned through the display volume, it is selectively illuminated using red, green, and blue lasers to create various colors. The result is a three-dimensional image in free space that can be viewed from any angle without the limitations of current holographic or light-field technologies.
Source: https://goo.gl/TFLjDC (Nature News)
Journal Article: https://goo.gl/4EVDRW (Nature)
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