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  • Title: Spectral broadening in anatase titanium dioxide waveguides at telecommunication and near-visible wavelengths.
    Author: Evans CC, Shtyrkova K, Bradley JD, Reshef O, Ippen E, Mazur E.
    Journal: Opt Express; 2013 Jul 29; 21(15):18582-91. PubMed ID: 23938730.
    Abstract:
    We observe spectral broadening of femtosecond pulses in single-mode anatase-titanium dioxide (TiO(2)) waveguides at telecommunication and near-visible wavelengths (1565 and 794 nm). By fitting our data to nonlinear pulse propagation simulations, we quantify nonlinear optical parameters around 1565 nm. Our fitting yields a nonlinear refractive index of 0.16 × 10(-18) m(2)/W, no two-photon absorption, and stimulated Raman scattering from the 144 cm(-1) Raman line of anatase with a gain coefficient of 6.6 × 10(-12) m/W. Additionally, we report on asymmetric spectral broadening around 794 nm. The wide wavelength applicability and negligible two-photon absorption of TiO(2) make it a promising material for integrated photonics.
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