Nonlinear optical effects-induced spectralbroadening in ZnO channel waveguides

Nonlinear optical effects-induced spectralbroadening in ZnO channel waveguides

Author(s): Edgar Yoshio Morales Teraoka, Tomohiro Kita, Tohoku Univ. (Japan);Daniel H. Broaddus, Cornell Univ. (United States); Atsushi Tsukazaki, The Univ.of Tokyo (Japan) and PRESTO, Japan Science and Technology Agency (Japan);Masashi Kawasaki, Tohoku Univ. (Japan) and WPI Advanced Institute for MaterialsResearch, Tohoku Univ. (Japan); Alexander L. Gaeta, Cornell Univ. (UnitedStates); Hirohito Yamada, Tohoku Univ. (Japan)
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We report the observation of enhanced nonlinear optical effects in ZnO channelwaveguides. Our research is focused on obtaining waveguides with enhancednonlinear properties. We demonstrate spectral broadening using femtosecondoptical pulses at a wavelength of 840 nm. We obtained a maximum of six-foldbroadening. Spectral features characteristic of SPM were appreciated. Wecalculated the nonlinear parameter gamma, obtaining values up to 13.9 W-1m-1.It represents more than 1300 times the gamma of a highly nonlinear fiber.Single-crystal ZnO showed to be a promising material for optical waveguidesintended for nonlinear applications.