Science China Technological Sciences

, Volume 54, Issue 1, pp 1–5

Lattice constant effects of photonic crystals on the extraction of guided mode of GaN based light emitting diodes

  • XingXing Fu
  • Bei Zhang
  • XiangNing Kang
  • Jun Xu
  • Chang Xiong
  • GuoYi Zhang
Article

DOI: 10.1007/s11431-010-4196-9

Cite this article as:
Fu, X., Zhang, B., Kang, X. et al. Sci. China Technol. Sci. (2011) 54: 1. doi:10.1007/s11431-010-4196-9

Abstract

We have fabricated a series of square-lattice hole photonic crystal (2PhC) arrays simultaneously at the un-current injection region on a special sample of GaN based light emitting diode (LED) by using focus ion beam milling (FIBM). The lattice constants of the 2PhC arrays vary from 230 to 1500 nm, while the 2PhC arrays have a constant area of about 9 μm × 18 μm and a fixed depth of 150±10 nm which approaches but does not penetrate the active layer. Microscopic electroluminescence images and spectral measurements consistently confirm that the top emitting intensities from different 2PhCs are all enhanced compared with the unpatterned region. It is demonstrated that the output coupling of propagating guided modes is realized by the diffracted transmission of the 2PhCs. The enhancement factors of the guided modes compared with the unpatterned region are plotted as function of the lattice constant. It is found that the highest enhancements for the extraction of guided modes were obtained for the lattice constant of 230 and 460 nm of 2PhCs. The results are discussed by the two-dimensional rigorous coupled wave analysis (RCWA).

Keywords

photonic crystal guided modes lattice pitches GaN-based light emitting diodes 

Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • XingXing Fu
    • 1
  • Bei Zhang
    • 1
  • XiangNing Kang
    • 1
  • Jun Xu
    • 1
  • Chang Xiong
    • 1
  • GuoYi Zhang
    • 1
  1. 1.School of Physics and State Key Laboratory for Artificial Microstructures and Mesoscopic PhysicsPeking UniversityBeijingChina

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