Now silicon is going to be used there in night vision cameras which is going to reduced down the cost which earlier is very high. Ordinarily,camera lenses are made from materials such as germanium and chalcogenide, which are much more expensive.
Silicon normally doesn't work for such lenses, as the material tends to absorb too much light, allowing little to get through to the camera's image sensor. A team of French researchers, however, discovered that this isn't a problem if the lens is very thin. They proceeded to laser-etch a Fresnel-style silicon lens, in which light is focused using concentric rings of material.
The finished lens is approximately 1 mm thick, 4 mm in diameter, has a 130-degree field of view, and works over a wide range of infrared wavelengths. While the images it captures may not be exactly broadcast-quality, they're sufficient for picking up individuals in low-light settings.
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