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Photonic band gap device and method using a periodicity defect region doped with a gain medium to increase photonic signal delay

  • US 6,396,617 B1
  • Filed: 05/17/2000
  • Issued: 05/28/2002
  • Est. Priority Date: 05/17/1999
  • Status: Expired due to Fees
First Claim
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1. A device for delaying a photonic signal by a predetermined delay, the photonic signal having a predetermined frequency and a predetermined bandwidth, comprising:

  • a first region having periodically alternating refractive material layers which exhibit a photonic band gap structure, said first region comprising a first refractive material layer having a first thickness and a first index of refraction, and a second refractive material layer having a second thickness and a second index of refraction;

    a second region having periodically alternating refractive material layers which exhibit a photonic band gap structure, said second region comprising a third refractive material layer having a third thickness and a third index of refraction, and a fourth refractive material layer having a fourth thickness and a fourth index of refraction; and

    a periodicity defect region, interposed between said first and second regions of periodically alternating refractive material layers, wherein said periodicity defect region is doped with a gain medium;

    wherein the first predetermined delay is imparted to the photonic signal during passage through the device when said periodicity defect region is excited by an energy source.

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