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Kvantovaya Elektronika, 2019, Volume 49, Number 10, Pages 951–957 (Mi qe17120)  

This article is cited in 13 scientific papers (total in 13 papers)

Nonlinear optical phenomena

Study of nonlinear optical properties of TiO2 – polystyrene nanocomposite films

M. Zeinalia, B. Jaleha, M. R. Rashidian Vazirib, A. Omidvara

a Department of Physics, Bu-Ali Sina University, Iran
b Photonics and Quantum Technologies Research School, Nuclear Science & Technology Research Institute, Iran
References:
Abstract: We consider an ex-situ prepared TiO2 – polystyrene (TiO2 – PS) nanocomposite, with different concentration of TiO2 nanoparticles (NPs), deposited by the spin-coating method on quartz substrates. Nonlinear optical properties of the TiO2 – PS nanocomposite films are studied using the Z-scan technique. Structural properties of the films are investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD) measurements. The optical band gap energy of the TiO2 – PS films are determined from the optical absorption spectra. The relation between the optical nonlinearities and the bandgap energy, as a microscopic electronic property of the semiconductor nanocomposite, is established. It is shown that an increase in the content of TiO2 NPs in the nanocomposite films results in bandgap narrowing and concomitant enhancement of optical nonlinearities. It is proposed that bandgap narrowing and enhancement of optical nonlinearities can be ascribed to the introduction of mid-gap states as a result of the formation of surface defects in TiO2 NPs. The results of this work indicate that incorporation of TiO2 NPs in the PS polymeric matrix can be a new way for bandgap narrowing of TiO2 NPs toward the visible light region, which is of great interest for their application in this part of the spectrum. Furthermore, enhancement of the optical nonlinearities of the spin-coated TiO2 – PS films by increasing the TiO2 NP content can open up new avenues for their use as nonlinear optical films in photonics applications.
Keywords: nanostructures, thin films, optical properties, photonics applications.
Received: 03.12.2018
Revised: 21.04.2019
English version:
Quantum Electronics, 2019, Volume 49, Issue 10, Pages 951–957
DOI: https://doi.org/10.1070/QEL16923
Bibliographic databases:
Document Type: Article
Language: Russian


Citation: M. Zeinali, B. Jaleh, M. R. Rashidian Vaziri, A. Omidvar, “Study of nonlinear optical properties of TiO2 – polystyrene nanocomposite films”, Kvantovaya Elektronika, 49:10 (2019), 951–957 [Quantum Electron., 49:10 (2019), 951–957]
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  • https://www.mathnet.ru/eng/qe/v49/i10/p951
  • This publication is cited in the following 13 articles:
    Citing articles in Google Scholar: Russian citations, English citations
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