Microstructure and percolation threshold characteristics of reactive sputtered Au–TiO2 granular composite films

Han, Junbo; Ding, Sha; Chen, Dai-Jian; Zhang, Hao; Wang, Qu‐Quan

doi:10.1016/j.jnoncrysol.2006.01.004

Cited by 7 publications

(2 citation statements)

References 14 publications

(13 reference statements)

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“…The absorption properties in the infrared region indicate that the unannealed film is dis-conductive, and the annealed ones are conductive. A transmission window at 516nm, which is characteristic of continuous Au films, [21] does not exist for the unannealed film, but appears for the annealed ones. There is an enhancement of plasmon resonant absorption with the annealing treatment.…”

Section: CImentioning

confidence: 98%

Annealing Induced Aggregations and Sign Alterations of Nonlinear Absorption and Refraction of Dense Au Nanoparticles in TiO ₂ Films

Peng

et al. 2008

Chinese Phys. Lett.

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Au-TiO2 dis-conductive composite films with Au atom concentrate as high as 82% are prepared by using reactive co-sputtering technique. The annealing effect on the nanostructures and optical nonlinearities of the composite films are investigated. Au nanoparticles aggregated to semi-continuum network structures during the annealing processes. As the annealing temperature increases from 25° C to 400° C, the surface plasmon absorption band is shifted and its strength is increased, consequently, the nonlinear absorption coefficient β decreases from 5.6 × 104 cm/GW to −1.7 × 104 cm/GW, while the nonlinear refractive index γ increases from —0.95 cm2/GW to 1.3 cm2/GW.

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Section: CImentioning

confidence: 98%

Annealing Induced Aggregations and Sign Alterations of Nonlinear Absorption and Refraction of Dense Au Nanoparticles in TiO ₂ Films

Peng

et al. 2008

Chinese Phys. Lett.

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“…[5,14−18] The third-order optical nonlinearity of Au-TiO 2 composite films reached the maximum at percolation threshold, which increased with sputtering pressure. [19] It's reported that the capped Au nano-particle films with high concentration and the rod like metal nanoparticles exhibited a large nonlinearity. [20−23] The dielectric with large refractive index such as TiO 2 and nano-sized metal particles was employed as the host matrix and the alternating layers to improve the enhancement factor.…”

Section: Introductionmentioning

confidence: 99%

Enhanced optical nonlinear absorption of graded Au–TiO ₂ composite films

2008

Chinese Phys. B

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This paper reports that single-layer and graded Au-TiO2 granular composite films with Au atom content 15%-66% were prepared by using reactive co-sputtering technique. The third-order optical nonlinearity of single-layer and graded composite films was investigated by using s- and p-polarized Z-scans in femtosecond time scale. The nonlinear absorption coefficient βeff of single-layer Au-TiO2 films is measured to be −2.3 × 103 – 0.76 × 103 cm/GW with Au atom content 15%–66%. The βeff value of the 10-layer Au-TiO2 graded film is enhanced to be −2.1 × 104cm/GW calculated from p-polarized Z-scans, which is about ten times the maximum βeff of single-layer films. Broadened response in the wavelength region 730–860 nm of the enhanced optical nonlinearity of graded Au-TiO2 composite films was also investigated.

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Enhancement of nonlinear optical properties of Au–TiO₂ granular composite with high percolation threshold

Zhou

et al. 2008

Physica Status Solidi (a)

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Two series of Au–TiO2 composite films with Au percola‐ tion threshold qC of 0.34 and 0.82 were prepared by using sputtering technique at the pressure of 5.0 × 10–2 and 8.0 × 10–2 Torr, respectively. As qC increases from 0.34 to 0.82, the plasmon resonant absorption of the composite films near qC shifts from about 700 nm to 760 nm, and the maximal second harmonic generation (SHG) intensity increases by 20%, the maximal nonlinear absorption coefficient increases from –3.0 × 104 cm/GW to 1.7 × 105 cm/GW, and the maximal nonlinear refraction index increases from a very small value to –2.6 cm2/GW. The large second‐ and third‐order optical nonlinearity of the Au–TiO2 composite films with high qC is attributed to the high density of Au particle in the nonconductive film and the strong local field enhancement caused by the surface plasmon resonant absorption. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Microstructure and percolation threshold characteristics of reactive sputtered Au–TiO2 granular composite films

Cited by 7 publications

References 14 publications

Annealing Induced Aggregations and Sign Alterations of Nonlinear Absorption and Refraction of Dense Au Nanoparticles in TiO ₂ Films

Annealing Induced Aggregations and Sign Alterations of Nonlinear Absorption and Refraction of Dense Au Nanoparticles in TiO ₂ Films

Enhanced optical nonlinear absorption of graded Au–TiO ₂ composite films

Enhancement of nonlinear optical properties of Au–TiO₂ granular composite with high percolation threshold

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Microstructure and percolation threshold characteristics of reactive sputtered Au–TiO2 granular composite films

Cited by 7 publications

References 14 publications

Annealing Induced Aggregations and Sign Alterations of Nonlinear Absorption and Refraction of Dense Au Nanoparticles in TiO 2 Films

Annealing Induced Aggregations and Sign Alterations of Nonlinear Absorption and Refraction of Dense Au Nanoparticles in TiO 2 Films

Enhanced optical nonlinear absorption of graded Au–TiO 2 composite films

Enhancement of nonlinear optical properties of Au–TiO2 granular composite with high percolation threshold

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Product

Resources

About

Annealing Induced Aggregations and Sign Alterations of Nonlinear Absorption and Refraction of Dense Au Nanoparticles in TiO ₂ Films

Annealing Induced Aggregations and Sign Alterations of Nonlinear Absorption and Refraction of Dense Au Nanoparticles in TiO ₂ Films

Enhanced optical nonlinear absorption of graded Au–TiO ₂ composite films

Enhancement of nonlinear optical properties of Au–TiO₂ granular composite with high percolation threshold