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Image sensors with optical trench

  • US 7,315,014 B2
  • Filed: 08/30/2005
  • Issued: 01/01/2008
  • Est. Priority Date: 08/30/2005
  • Status: Active Grant
First Claim
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1. An image pixel comprising:

  • a photo-conversion device formed over a substrate;

    at least one optically transmissive layer formed over said substrate;

    a trench formed within at least a portion of said substrate and defining an optical guide structure over the photo-conversion device; and

    at least one material filling said trench, said material having a lower refractive index than a refractive index of said substrate such that said reflection is produced by a refractive index difference.

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