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The Future of Holographic Video
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It’s all about manipulating light. Three of the primary methods include: reflection, refraction and diffraction. In this case, diffraction is the key, and essentially enables lines—almost any type—to bend and filter light.
In the journal Review of Scientific Instruments the team reports using surface acoustic waves as a dynamic pattern of lines to control light’s angle and color composition.
How does it work? The magic happens on the surface of a special crystal called lithium niobate (LiNbO3), which boasts excellent optical properties. Beneath the surface of the LiNbO3, microscopic channels, or “waveguides,” are created to confine light passing through. A metal electrode is then deposited onto each waveguide, which can produce surface acoustic waves.
The resulting frequency division of color enables a new type of color display. This means that “for a wavelength display, we don’t need to rely on color filter wheels or dedicated red and blue pixels,” explained Daniel E. Smalley, assistant professor of electrical engineering at BYU, who first reported an advance in this realm in Nature in 2013, while he was a graduate student working at MIT with his advisor V. Michael Bove.
Instead of a color wheel, any color combination is possible with their approach simply by altering the frequency of the signal sent to the “white waveguide pixel.” In other words, Smalley said, “we can color the output of our display by ‘coloring’ the frequencies of the drive signal.”
Source: http://truthisscary.com/2015/02/the-future-of-holographic-video/
