Emission spectroscopy of ZnO inverse opal photonic crystals

Michael Scharrer, Heeso Noh, Mikhail V. Erementchouk, Hui Cao, Robert P.H. Chang

Research output: Contribution to journalConference article

Abstract

Light emitted within a photonic crystal structure can be used to probe both the photonic density of states and the anisotropic propagation of light through the structure. Here we present results of angle- and polarization-resolved measurements of photoluminescence from three-dimensional ZnO photonic crystals. The ZnO inverse opals were fabricated by infiltration of polystyrene synthetic opal templates using atomic layer deposition. The resulting nanocrystalline ZnO structures exhibit strong UV emission as well as a broad defect emission peak, allowing us to observe the dispersion of the primary as well as higher-order PBGs over the entire visible spectrum. The spontaneous emission spectrum is strongly modified and anisotropic due to the effect of the photonic band structure. The observed features are correlated to transmission and reflection measurements as well as calculated (reduced) band structures in the F-L-K plane of the fee Brillouin zone. Apart from the suppression and redistribution of light near the primary and higher band gaps, we observe a strong enhancement in the PL peaks due to light propagation in higher (e.g. 5th and 6th) photonic bands at frequencies and angles where no PBG exists.

Original languageEnglish
Article number64800S
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume6480
DOIs
Publication statusPublished - May 24 2007
EventPhotonic Crystal Materials and Devices VI - San Jose, CA, United States
Duration: Jan 22 2007Jan 25 2007

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Keywords

  • Emission
  • Photonic crystals
  • Polarization
  • ZnO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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