GaN directional couplers for integrated quantum photonics

Zhang Yanfeng, Loyd James McKnight, Erman Engin, Ian Watson, Martin J. Cryan, Erdan Gu, Mark G. Thompson, Stephane Calvez, Jeremy L. O’Brien, Martin Dawson

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)


Large cross-section GaN waveguides are proposed as a suitable architecture to achieve integrated quantum photonic circuits. Directional couplers with this geometry have been designed with aid of the beam propagation method and fabricated using inductively coupled plasma etching. Scanning electron microscopy inspection shows high quality facets for end coupling and a well defined gap between rib pairs in the coupling region. Optical characterization at 800 nm shows single-mode operation and coupling-length-dependent splitting ratios. Two photon interference of degenerate photon pairs has been observed in the directional coupler by measurement of the Hong-Ou-Mandel dip.
Original languageEnglish
Article number161119
Number of pages3
JournalApplied Physics Letters
Issue number16
Publication statusPublished - 29 Oct 2011


  • optics
  • GaN directional coupler
  • waveguides
  • directional couplers
  • wide band gap semiconductors
  • sputter etching


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