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Multiple band reflector with metal and dielectric layers

  • US 7,564,628 B2
  • Filed: 06/06/2006
  • Issued: 07/21/2009
  • Est. Priority Date: 06/06/2006
  • Status: Active Grant
First Claim
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1. A multiple band visible light reflector, comprising:

  • a substrate;

    a stack disposed on said substrate or on one or more intervening layers that are disposed on said substrate, wherein said stack comprises;

    a first metal layer disposed in contact with said substrate;

    a first dielectric layer disposed in contact with said first metal layer;

    a second metal layer disposed in contact with said first dielectric layer;

    a second dielectric layer disposed in contact with said second metal layer;

    a third metal layer disposed in contact with said second dielectric layer;

    a third dielectric layer disposed in contact with said third metal layer;

    a fourth metal layer disposed in contact with said third dielectric layer; and

    ,a fourth dielectric layer disposed in contact with said fourth metal layer;

    wherein said first dielectric layer and said second dielectric layer have a difference in thickness of at least 6 percent optical thickness;

    wherein each of said first dielectric layer, said second dielectric layer, said third dielectric layer, and said fourth dielectric layer has a thickness of 40 to 100 nanometers;

    wherein said reflector reflects light over the visible spectrum in at least two reflection peaks, wherein the intensity of each reflection peak is at least 45% of incident light at the same wavelength as said each reflection peak and the intensity of valleys between said reflection peaks are no more than 50% of the average intensities of said reflection peaks; and

    ,wherein said stack has a thickness of less than 0.5 microns.

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