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Article and coating having improved reflectance suppression

  • US 4,735,488 A
  • Filed: 03/03/1986
  • Issued: 04/05/1988
  • Est. Priority Date: 11/16/1983
  • Status: Expired due to Term
First Claim
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1. A structure for providing suppression of reflectance of radiation and for enhancing emissivity comprising:

  • a substrate formed of a material having a reststrahlen band;

    at least one grouping of materials deposited over said substrate including a first antireflection coating deposited over said substrate;

    a relatively thick first spacer layer deposited over said first antireflectance coating;

    a second antireflection coating deposited over said spacer layer; and

    a relatively thick first absorber layer deposited over said second antireflection coating and having intrinsic absorption in the reststrahlen band exhibited by the substrate, said first and second antireflection coatings, said spacer layer and said absorber layer being formed of materials having indices of refraction which in combination act in concert to substantially suppress the reststrahlen band of the substrate, said antireflection coatings permitting the use of materials in the spacer layer having a higher index of refraction than the index of refraction of the material of the absorber layer.

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