Evans Christopher C, Shtyrkova Katia, Bradley Jonathan D B, Reshef Orad, Ippen Erich, Mazur Eric
School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, Cambridge, Massachusetts 02138, USA.
Opt Express. 2013 Jul 29;21(15):18582-91. doi: 10.1364/OE.21.018582.
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.
我们观察到飞秒脉冲在电信和近可见光波长（1565纳米和794纳米）下于单模锐钛矿型二氧化钛（TiO₂）波导中出现光谱展宽。通过将我们的数据与非线性脉冲传播模拟进行拟合，我们量化了1565纳米附近的非线性光学参数。我们的拟合得出非线性折射率为0.16×10⁻¹⁸米²/瓦，不存在双光子吸收，以及来自锐钛矿型144厘米⁻¹拉曼线的受激拉曼散射，增益系数为6.6×10⁻¹²米/瓦。此外，我们报告了794纳米附近的不对称光谱展宽。TiO₂的宽波长适用性和可忽略不计的双光子吸收使其成为集成光子学中有前景的材料。
