Ultrahigh spontaneous emission extraction efficiency induced by evanescent wave coupling

@article{Wang2009UltrahighSE,
  title={Ultrahigh spontaneous emission extraction efficiency induced by evanescent wave coupling},
  author={Xue-Lun Wang and S. Furue and Mutsuo Ogura and Valia Voliotis and Marco Ravaro and Alexandre Enderlin and Roger Grousson},
  journal={Applied Physics Letters},
  year={2009},
  volume={94},
  pages={091102}
}
A spontaneous emission extraction efficiency greater than 50% is observed in a GaAs/AlGaAs quantum well structure grown on the subwavelength-sized ridge top facet of a V-grooved substrate by means of photoluminescence study. This is an extraction efficiency about 20 times higher than that of a similar structure grown on a flat substrate. It is demonstrated both experimentally and theoretically that the high extraction efficiency is the result of the efficient conversion of evanescent waves into… 

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