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Jump directly to: conventional view | bottom line What you need to know - Conventional View• Most surfaces, from a puddle of water to a mirror, reflect some light.• One type of optical coating is an anti-reflection coating, which reduces unwanted reflections from surfaces, and is commonly used on spectacles and photographic lenses. • Conventional anti-reflection coatings, although widely used, work only at a single wavelength and only when the light source is positioned directly perpendicular to the material. • A technique called oblique angle deposition strongly reduces or eliminates reflection at all wavelengths and incoming angles of light. • The oblique angle evaporation technique is already widely used in the industry, and the design can be applied to any type of substrate -- not just an expensive semiconductor such as aluminum nitride. • This is material with a refractive index of 1.05, which is extremely close to the refractive index of air and the lowest ever reported. Window glass, in comparison, has a refractive index of about 1.45. • The refractive index is a fundamental property that governs the amount of light a material reflects, as well as other optical properties such as diffraction, refraction, and the speed of light inside the material. • The new optical coating could find use in just about any application where light travels into or out of a material, such as more efficient solar cells, brighter LEDs, "smart" lighting, high-reflectance mirrors, and black body radiation. Bottom line• A new optical light technology reflects virtually no light.Get articles like this delivered to you FREE in our popular email newsletter Related CounterThink Cartoons:
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