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Apparatus and method for optical heterodyne conversion

  • US 5,663,639 A
  • Filed: 01/18/1994
  • Issued: 09/02/1997
  • Est. Priority Date: 01/18/1994
  • Status: Expired due to Fees
First Claim
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1. A photomixer comprising:

  • a substrate;

    a first layer of at least one III-V compound, the bottom of the first layer facing the substrate and the first layer including molecules of the at least one compound bonded to form a uniform crystal lattice and additional atoms of a column V element in addition to those required to form the uniform crystal lattice, the additional atoms being disposed within the uniform crystal lattice to form defects in the uniform crystal lattice; and

    a second electrically conductive layer formed over the first layer comprising a region of electrically conductive interdigitated electrodes with openings in the conductive layer exposing said first layer, whereby an electrical signal of a third frequency is coupled from the first layer to the electrically conductive layer as the first layer receives optical radiation of a first and second frequency, the third frequency being the difference between the first and second frequencies of the optical radiation.

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