Windows and mirrors embedded with liquid crystals can hide images that only appear when the right kind of light is shined on them. The technique is inspired by a 4000-year-old trick for building “magic mirrors'
at the University of Ottawa in Canada and his colleagues used those insights to build a new type of magic mirror and window. Their versions contain a state of matter known as a liquid crystal. While liquids flow freely and crystal atoms are organised in stiff grids,A magic mirror reveals an imageMany television screens employ liquid crystals because their properties, like colour, can be controlled by changing the patterns of the molecules.
For millennia-old mirrors, very slight bumps and indentations on their surfaces made light bounce off in just the right way to form an image. By comparison, the liquid crystal magic windows are completely flat and smooth. The researchers were also able to decide exactly what properties the light must have to uncover the hidden image, such as its polarisation. Using the wrong kind of light results in nonsense images or the negative of the hidden image.
Images revealed by the new technique look clear when viewed from different angles and distances. The researchers say this means it could be used to improve projectors for 3D images, which often only show a sharp image when the viewer faces them just right.
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