title: Nonlinear optical absorption and switching properties of gold nanoparticle doped SiO2-TiO2 sol-gel films.
abstract: The nonlinear optical absorption and switching properties of sol-gel derived of Au nanoparticle doped SiO2-TiO2 sol-gel films having different Au-surface plasmon absorption positions are reported in this paper. The Au nanoparticles are embedded in SiO2 and SiO2-TiO2 mixed glassy film matrices with different refractive index values. To study the nonlinear absorption properties, lasers with three different wavelengths are used. The optical switching behavior is studied by using the pump-probe technique with 532 nm as the excitation wavelength. Ground state conduction band, surface plasmon band, and the free carrier band are taken as three level model to explain theoretically the obtained RSA and SA behaviors.
authors.affiliation: School of Physics, University of Hyderabad, India.
authors.forename: N
authors.initials: N
authors.lastname: Venkatram
authors.forename: R Sai Santosh
authors.initials: RS
authors.lastname: Kumar
authors.forename: D Narayana
authors.initials: DN
authors.lastname: Rao
authors.forename: S K
authors.initials: SK
authors.lastname: Medda
authors.forename: Sucheta
authors.initials: S
authors.lastname: De
authors.forename: Goutam
authors.initials: G
authors.lastname: De
mesh_terms: D003460:Crystallization / Q000379:methods*; D006046:Gold / Q000737:chemistry*; D046911:Macromolecular Substances; D008422:Materials Testing; D008567:Membranes, Artificial; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods; D017711:Nonlinear Dynamics; D055095:Optics and Photonics; D010316:Particle Size; D010777:Photochemistry / Q000379:methods*; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D046911:Macromolecular Substances; D008567:Membranes, Artificial; C009495:titanium dioxide; D006046:Gold; D012822:Silicon Dioxide; D014025:Titanium