中国物理B ›› 2014, Vol. 23 ›› Issue (3): 34210-034210.doi: 10.1088/1674-1056/23/3/034210
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
S. Divya, Indu Sebastian, V. P. N. Nampoori, P. Radhakrishnan, A. Mujeeb
S. Divya, Indu Sebastian, V. P. N. Nampoori, P. Radhakrishnan, A. Mujeeb
摘要: We present the linear and nonlinear optical studies on TiO2–SiO2 nanocomposites with varying compositions. Optical band gap of the material is found to vary with the amount of SiO2 in the composite. The phenomenon of two-photon absorption (TPA) in TiO2/SiO2 nanocomposites has been studied using open aperture Z-scan technique. The nanocomposites show better nonlinear optical properties than pure TiO2, which can be attributed to the surface states and weak dielectric confinement of TiO2 nanoparticles by SiO2 matrix. The nanocomposites are thermally treated and similar studies are performed. The anatase form of TiO2 in the nanocomposites shows superior properties relative to the amorphous and rutile counterpart. The involved mechanism is explained by rendering the dominant role played by the excitons in the TiO2 nanoparticles.
中图分类号: (Nonlinear optics)