Reducing the reflectance of surfaces to radiation
AssigneeThe Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
InventorsPeter Brian Clapham, Michael Christopher Hutley
Life of this patent
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Abstract
A method of producing a surface having a reduced reflectance to electromagnetic radiation in a predetermined wavelength band which comprises arranging on the surface a regular array of protuberances having a height which is not less than one third of the length of the longest wavelength in the band and at a spacing which is less than the length of the shortest wavelength of the band divided by the refractive index of the material of which the protuberances consist.
Claims16
A photo-exposure method for reducing the reflectance of a surface to electromagnetic radiation in a predetermined wavelength band which comprises applying a layer of photosensitive material to said surface, exposing the photosensitive layer to a regular pattern of light to which it is sensitive, and processing the exposed photosensitive layer to convert the effect of said light pattern on said photosensitive layer into a regular array of protuberances on said surface having a height which is not less than one third of the length of the longest wavelength in the band and at a spacing between adjacent protuberances which is less than the length of the shortest wavelength of the band divided by the refractive index of the material of which the protuberances consist.
Dependencies are inferred from the claim text.