Band gap tuning and nonlinear optical characterization of TiO2-SiO2 nanocomposites with respect to composition and phase

被引：9

作者：

Divya, S. ^{[1
]}

Sebastian, Indu ^{[1
]}

Nampoori, V. P. N. ^{[1
]}

Radhakrishnan, P. ^{[1
]}

Mujeeb, A. ^{[1
]}

机构：

[1] Cochin Univ Sci & Technol, Int Sch Photon, Cochin 682016, Kerala, India

来源：

OPTICAL MATERIALS | 2014年 / 37卷

关键词：

Reverse Saturable Absorption (RSA); Saturable absorption (SA); Excitons; OXIDE THIN-FILMS; ANATASE;

D O I：

10.1016/j.optmat.2014.07.004

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the linear and nonlinear optical studies on TiO2-SiO2 nanocomposites with varying percentage ratio. It is found that optical band gap of the material varies with respect to the amount of the SiO2 in the composite. Nonlinear optical characterization of these samples was studied by using open as well as closed aperture Z-scan technique using an Nd:YAG laser (532 nm, 7 ns, 10 Hz). The nanocomposites showed enhanced nonlinear optical properties than pure TiO2 and this can be attributed to the surface states and weak dielectric confinement of TiO2 nanoparticles by SiO2 matrix. The nanocomposites were thermally treated and similar studies were performed. The anatase form of TiO2 in the nanocomposites showed superior properties relative to the amorphous and rutile phase of the composite. The involved mechanism is explained by taking into account the dominant role played by the excitons in the TiO2 nanoparticles. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：433 / 438

页数：6

共 14 条

[1] Optically pumped lasing of ZnO at room temperature [J].

Bagnall, DM ;

Chen, YF ;

Zhu, Z ;

Yao, T ;

Koyama, S ;

Shen, MY ;

Goto, T .

APPLIED PHYSICS LETTERS, 1997, 70 (17) :2230-2232

[2] Tailoring optical properties of TiO2 in silica glass for limiting applications [J].

Divya, S. ;

Sebastian, Indu ;

Nampoori, V. P. N. ;

Radhakrishnan, P. ;

Mujeeb, A. .

CHINESE PHYSICS B, 2014, 23 (03)

[3] Optical nonlinearity of hybrid and nanocomposite materials prepared by the sol-gel method [J].

Gan, FX .

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 1998, 13 (1-3) :559-563

[4]

Hemissi M, 2007, DIG J NANOMATER BIOS, V2, P299

[5] Third-order optical nonlinearities in anatase and rutile TiO2 thin films [J].

Long, Hua ;

Chen, Aiping ;

Yang, Guang ;

Li, Yuhua ;

Lu, Peixiang .

THIN SOLID FILMS, 2009, 517 (19) :5601-5604

[6] Microstructural and nonlinear optical properties of silica-titania sol-gel film doped with PbS quantum dots [J].

Martucci, A ;

Fick, J ;

Schell, J ;

Battaglin, G ;

Guglielmi, M .

JOURNAL OF APPLIED PHYSICS, 1999, 86 (01) :79-87

[7] The preparation of copper(II) oxide thin films and the study of their microstructures and optical properties [J].

Oral, AY ;

Mensur, E ;

Aslan, MH ;

Basaran, EB .

MATERIALS CHEMISTRY AND PHYSICS, 2004, 83 (01) :140-144

[8] Optical limiting properties of a zinc porphyrin polymer and its dimer and monomer model compounds [J].

Qureshi, FM ;

Martin, SJ ;

Long, X ;

Bradley, DDC ;

Henari, FZ ;

Blau, WJ ;

Smith, EC ;

Wang, CH ;

Kar, AK ;

Anderson, HL .

CHEMICAL PHYSICS, 1998, 231 (01) :87-94

[9] THEORY OF THE LINEAR AND NONLINEAR OPTICAL-PROPERTIES OF SEMICONDUCTOR MICROCRYSTALLITES [J].

SCHMITTRINK, S ;

MILLER, DAB ;

CHEMLA, DS .

PHYSICAL REVIEW B, 1987, 35 (15) :8113-8125

[10] HIGH-SENSITIVITY, SINGLE-BEAM N2 MEASUREMENTS [J].

SHEIKBAHAE, M ;

SAID, AA ;

VANSTRYLAND, EW .

OPTICS LETTERS, 1989, 14 (17) :955-957

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