@article {Evans:749,
	title = {Multimode phase-matched third-harmonic generation in sub-micrometer-wide anatase TiO2 waveguides},
	journal = {Optics Express},
	volume = {23},
	year = {2015},
	pages = {7832{\textendash}7841},
	abstract = {Third-harmonic generation (THG) has applications ranging from wavelength conversion to pulse characterization, and has important implications for quantum sources of entangled photons. However, on-chip THG devices are nearly unexplored because bulk techniques are difficult to adapt to integrated photonic circuits. Using sub- micrometer-wide polycrys- talline anatase TiO2 waveguides, we demonstrate third-harmonic generation on a CMOS-compatible platform. We correlate higher conversion effi- ciencies with phase-matching between the fundamental pump mode and higher-order signal modes. Using scattered light, we estimate conversion efficiencies as high as 2.5\% using femtosecond pulses, and thus demonstrate that multimode TiO2 waveguides are promising for wideband wavelength conversion and new applications ranging from sensors to triplet-photon sources.},
	doi = {10.1364/OE.23.007832},
	url = {/files/mazur/files/rep_749.pdf},
	author = {C. C. Evans and K. Shtyrkova and O. Reshef and M. Gerhard Moebius and J. D.B. Bradley and S. Griesse-Nascimento and E. Ippen and Mazur, E.}
}
