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Effective Dielectric Response of Nonlinear Composites of Coated Metal Inclusions |
| CHEN Guo-Qing;WU Ya-Min |
| School of Science, Southern Yangtze University, Wuxi 214122 |
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| Cite this article: |
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CHEN Guo-Qing, WU Ya-Min 2007 Chin. Phys. Lett. 24 1724-1727 |
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Abstract The effective dielectric response of the composites in which nondilute coated metal particles are randomly embedded in a linear host is investigated. Two types of coated particles are considered, one is that the core is nonlinear, the other is that the shell is nonlinear. We derive general expressions for the effective linear dielectric function and the effective third-order nonlinear susceptibility, and take one step forward to perform numerical calculations on the coated metal/dielectric composites. Numerical results show that the effective linear and nonlinear dielectric responses can be greatly enhanced near the surface plasmon resonant frequency. Moreover, the resonant peaks
are found within a range from 0.46ωp to 0.57ωp for spherical particles and from 0.59ωp to 0.70ωp for cylindrical inclusions. In the frequency region, the resonant peak can achieve the maximum, according to an optimal structural parameter and volume fraction. The resonant frequency exhibits a redshift with the increasing structural parameter k or volume fraction f or dimensionality factor D.
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| Keywords:
77.84.Lf
42.65.An
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Received: 28 February 2007
Published: 17 May 2007
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| PACS: |
77.84.Lf
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(Composite materials)
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42.65.An
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(Optical susceptibility, hyperpolarizability)
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