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Light emitting devices with high light collimation

  • US 7,098,589 B2
  • Filed: 11/26/2003
  • Issued: 08/29/2006
  • Est. Priority Date: 04/15/2003
  • Status: Active Grant
First Claim
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1. A light-emitting device, comprising:

  • a multi-layer stack of materials including a light-generating region and a first layer supported by the light-generating region; and

    a support;

    wherein;

    the light-generating region is between the first layer and the support;

    a surface of the first layer is configured so that light generated by the light-generating region can emerge from the light-emitting device via the surface of the first layer;

    the surface of the first layer has a dielectric function that varies spatially according to a pattern;

    the pattern is formed of holes in the surface of the first layer;

    the pattern is configured so that light generated by the light-generating region that emerges from the light-emitting device via the surface of the first layer is more collimated than a Lambertian distribution of light; and

    the pattern has an ideal lattice constant and a detuning parameter with a value greater than zero.

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