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QWIP with enhanced optical coupling

  • US 20040159775A1
  • Filed: 02/18/2004
  • Published: 08/19/2004
  • Est. Priority Date: 12/24/1999
  • Status: Active Grant
First Claim
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1. A pixel-registered photo detector array comprising:

  • one or more detector layers of semiconductor material, each detector layer between contact layers of semiconductor material, thereby defining a stack of layers having a front side and a back side; and

    a waffle-type light-coupling grating formed on the backside of the stack, the grating having a pattern of holes that reflects a substantial portion of light coming into the array so as to disperse that light through the one or more detector layers, thereby facilitating absorption.

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