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Omnidirectional UV-IR reflector

  • US 9,229,140 B2
  • Filed: 01/26/2011
  • Issued: 01/05/2016
  • Est. Priority Date: 08/12/2007
  • Status: Active Grant
First Claim
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1. An omnidirectional UV-IR reflector comprising:

  • a multilayer stack having an average thickness between 0.5 and 10 microns and between four and thirteen layers, said between four and thirteen layers having at least two first index of refraction material layers H1 and H2, and at least two second index of refraction material layers L1 and L2, said at least two first index of refraction material layers and said at least two second index of refraction material layers alternately stacked on top of each other such that said H1 layer is located between said L1 layer and said L2 layer, and said L2 layer is located between said H1 layer and said H2 layer;

    said between four and thirteen layers each having a predefined thickness of dH1, dH2, dL1, dL2 with said dH1 thickness not generally equal to said dH2 thickness and said dL1 thickness not generally equal to said du thickness; and

    wherein said multilayer stack when shined by light at incident angles between 0 to 45 degrees, has a first high reflectivity bandwidth with more than 50% reflectance of electromagnetic radiation having wavelengths less than about 400 nanometers, a second high reflectivity bandwidth with more than 80% reflectance of electromagnetic radiation having wavelengths greater than about 800 nanometers, and a low reflectivity bandwidth with less than 20% reflectance of electromagnetic radiation having wavelengths between about 400 nanometers to 800 nanometers.

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