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New material reflects other color by deforming the
Scientists at UC Berkeley in California have developed ultra-thin material that other colors reflect upon bending. The film of silicon could ever be used to detect virtually invisible cracks in, for example, bridges, buildings or airplanes.
The film makes use of a novel approach to change color. This method is based on the adaptation of the surface to reflect different visible wavelengths, instead of changing the chemical composition of a material. In the semiconductor material of 120nm thick ribs and bars are etched thinner than a single light wave. Each obstacle in the film is designed to reflect a particular wavelength of light. Because of the film to bend or stretch, the film reflects other colors.
The first piece of material was only one square centimeter in size, but one of the researchers said that there are already several possibilities to produce even larger surfaces of the material within the existing semiconductor industry. Once that is successful, the researchers hope to find applications. They think in the first instance to sensors that change color to, for example, metal fatigue, as well as the entertainment industry and security sector would be able to make use of it.
The way to “make” different colors also in nature. Certain butterflies and beetles change as color. The material developed by scientists reflects up to 83 percent of the incoming light and changes color at a deflection of 25 nm. The color shift in the prototype goes from green to yellow, orange and red wavelengths of about 39nm. Further research will need to display the number increase color.Viewing:-183
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