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*Materials Transactions*, Vol.50 No.05 (2009) pp.994-998

© 2009 The Japan Institute of Metals

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An FDTD Analysis of Nanostructured Electromagnetic Metamaterials Using Parallel Computer

Ryosuke Umeda, Chieko Totsuji, Kenji Tsuruta and Hiroo Totsuji

Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
Metamaterial with negative permittivity and permeability is studied by means of computer simulations. We analyze the electromagnetic response of nanostructured metamaterials to evanescent waves at optical frequency via the finite-difference time-domain simulatioins on parallel computer. Effects of the nanostructure on dielectric and magnetic properties are taken into account by introducing the Drude-Lorentz model in the materials dispersion. Size effect on the dispersion is examined by comparing the model with that of a noble metal particle. A re-focusing and an amplification of the evanescent waves propagating through a metamaterial, consisting of metal slabs/vacuum stacking, are demonstrated for the frequency range at 614–744 THz. By properly treating the materials dispersion, we show that the nanostructured metamaterial may behave as a left-handed material in the optical range.

(Received 2008/11/7; Accepted 2009/2/20; Published 2009/4/15)

**Keywords:** finite-difference time-domain method, metamaterial, nanostructure, evanescent wave

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