![]() Credit: Felix Hufnagel, University of Ottawa The video shows the intensity distribution smoothly evolving from the input beam profile to the desired image pattern. The magic windows the researchers created appear perfectly flat to the naked eye but, in fact, have slight variations that create an image in response to light. “By designing the window to be relatively smooth, the image that is created can be seen over a large range of distances from the window.” “The magic window we created appears perfectly flat to the naked eye but, in fact, has slight variations that create an image in response to light,” said research team leader Felix Hufnagel from the University of Ottawa. It took scientists until the early 20th century to figure out that these devices work because an image cast into the back of the mirror creates small surface variations that cause the image to form – and it took engineers until now to apply the same principle to liquid crystals for high-tech displays. Thousands of years ago, artisans in China and Japan made bronze mirrors that looked like regular flat mirrors while viewing one’s reflection but generated another image when illuminated by direct sunlight. The technology represents a novel twist on a very old light trick. Credit: Felix Hufnagel, University of Ottawa Researchers Create Flat Magic Window With Liquid Crystalsįor the first time, scientists empolyed liquid crystals to construct a flat magic window - a transparent device that produces a hidden image when light shines on it. Researchers have used liquid crystals to create magic windows that produce a hidden image when light shines on them.
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