Polarization-independent light emission enhancement of ZnO/Ag nanograting via surface plasmon polariton excitation and cavity resonance

Minji Gwon, Y. U. Lee, J. W. Wu, Dahyun Nam, Hyeonsik Cheong, Dong Wook Kim

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

In this study, we observed that the photoluminescence (PL) intensity of ZnO/Ag nanogratings was significantly enhanced compared with that of a planar counterpart under illumination of both transverse magnetic (TM) and transverse electric (TE)-mode light. In the TM mode, angle-resolved reflectance spectra exhibited dispersive dips, indicating cavity resonance as well as grating-coupled surface plasmon polariton (SPP) excitation. In the TE mode, cavity resonance only was allowed, and broad dips appeared in the reflectance spectra. Strong optical field confinement in the ZnO layers, with the help of SPP and cavity modes, facilitated polarization-insensitive PL enhancement. Optical simulation results were in good agreement with the experimental results, supporting the suggested scenario.

Original languageEnglish
Pages (from-to)8602-8605
Number of pages4
JournalACS Applied Materials and Interfaces
Volume6
Issue number11
DOIs
StatePublished - 11 Jun 2014

Keywords

  • cavity resonance
  • nanograting
  • surface plasmon polariton
  • ZnO

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