Spontaneous emission extraction and purcell enhancement from thin-film 2-D photonic crystals

M Boroditsky, R Vrijen, Thomas Fraser Krauss, R Coccioli, R Bhar, E Yablonovitch

Research output: Contribution to journalArticlepeer-review

285 Citations (Scopus)

Abstract

Electromagnetic band structure can produce either an enhancement or a suppression of spontaneous emission from two-dimensional (2-D) photonic crystal thin films. We believe that such effects might be important for light emitting diodes. Our experiments were based on thin-film InGaAs/InP 2-D photonic crystals at ambient temperature, but the concepts would apply equally to InGaN thin films, for example. We show that the magnitude of Purcell enhancement factor, F-p similar to 2, for spatially extended band modes, is similar to that for a tiny mode in a three-dimensional (3-D) nanocavity. Nonetheless, light extraction enhancement that arises from Zone folding or Bragg scattering of the photonic bands is probably the more important effect, and an external quantum efficiency > 50% is possible. Angle resolved photoluminescence from inside the photonic crystal gives a direct spectral readout of the internal 2-D photonic band dispersion. The tradeoffs for employing various photonic crystal structures in high efficiency light-emitting diodes are analyzed.

Original languageEnglish
Pages (from-to)2096-2112
Number of pages17
JournalJournal of Lightwave Technology
Volume17
Issue number11
Publication statusPublished - Nov 1999

Keywords

  • photonic crystals
  • Purcell effect
  • spontaneous emission
  • LIGHT-EMITTING-DIODES
  • DOUBLE HETEROSTRUCTURES
  • QUANTUM EFFICIENCY
  • BAND-STRUCTURE
  • GAP

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