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Issue Eur. Phys. J. Appl. Phys.
Volume 46, Number 2, May 2009
Article Number 20701
Number of page(s) 5
Section Photonics
DOI 10.1051/epjap/2009045
Published online 03 April 2009

Eur. Phys. J. Appl. Phys. 46, 20701 (2009)
DOI: 10.1051/epjap/2009045

Shape effect on strongly nonlinear response of elliptical composites

M. Natenapit and J. Thongsri

Department of Physics, Faculty of Science, Chulalongkorn University, 10330 Bangkok, Thailand

n_mayuree@hotmail.com

Received: 1st October 2008 / Accepted: 30 January 2009 / Published online: 3 April 2009

Abstract
The electric field responses of strongly nonlinear dielectric composites that consist of elliptical strongly nonlinear dielectric inclusions which are randomly oriented and embedded in different strongly nonlinear dielectric media in the dilute limit are investigated. By using the decoupling approximation, the effective nonlinear coefficients ($\chi_{e}$) are determined for varying the contrast between the nonlinear coefficients of inclusions and medium $(\chi_{i}/\chi_{m})$ with the aspect ratio, the ratio between semi major and semi minor axes, as parameters. The results show that increasing the aspect ratios within the range of 1 to 10 does not affect $\chi_{e}$ for low contrast $(\chi_{i}/\chi_{m}$ from 0.4 to 2.5). For high contrasts, the larger the aspect ratios, the greater the effects on $\chi_{e}$ are observed with enhancement and suppression of $\chi_{e}$ being observed at $\chi_{i}/\chi_{m}>1$ and $\chi_{i}/\chi_{m}<1$, respectively.

PACS
72.20.Ht - High-field and nonlinear effects.
72.60.+g - Mixed conductivity and conductivity transitions.

© EDP Sciences 2009


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