@misc{indiciaebfc83855b4e3,
  title = {Nonlinear frequency conversion in waveguide directional couplers.},
  author = {Po Dong and Andrew G Kirk},
  year = {2004},
  doi = {10.1103/physrevlett.93.133901},
  url = {https://pubmed.ncbi.nlm.nih.gov/15524719/},
  note = {Source identifier: 15524719}
}