Microstructured transmission and reflectance modifying coating

G - Physics – 02 – B

Patent

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88/115, 126/11.2

G02B 1/10 (2006.01) F24J 2/48 (2006.01) G02B 1/11 (2006.01) G02B 3/08 (2006.01) H01L 31/0216 (2006.01) H01L 31/0236 (2006.01) C23C 14/14 (2006.01) C23C 14/58 (2006.01)

Patent

CA 1106668

913,318 ABSTRACT An article and method of making the same is disclosed, which article has a substantially antireflecting surface and comprises a substrate having a surface coating of a metal oxide such as an oxide of aluminum magnesium or zinc. The surface coating is a substantially complete conversion of a thin film of the selected metal wherein the thickness of the thin film prior to conversion is at least 5 nanometers. After conversion, the surface is characterized by a plurality of randomly positioned discrete leaflets of varying heights and sizes which extend from the surface a distance of not less than 20 nanometers, the bases of the leaflets contacting the bases of substantially all adjacent leaflets. The antireflecting properties thus provided by such a microstructured surface are such that the total specular reflectance of the coating of visible light incident and normal to the surface is less than 1%.

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