Optical properties of left-handed metamaterial involving coated nano-spheres
We present theoretical results of a left-handed metamaterial engineered by a combination of coated and solid nano-spheres. The structure is a binary composite of CdS–TiO 2 core–shell and Au solid nano-spheres which simultaneously dispersed in the air matrix. The effective medium parameters derived by extended Maxwell-Garnett (EMG) effective medium theory. It is shown the possibility of fine-tuning the metamaterial in order to observe left-handed behavior. The results are supplemented with transmittance curves, calculated by layer-multiple-scattering (LMS) method. The predictions of the EMG theory are in good agreement with those of LMS method; thus the (CdS–TiO 2)/Au nano-composite is an appropriate choice as a three-dimensional left-handed metamaterial.
KeywordsMetamaterial Left-handed Negative refraction index Extended Maxwell-Garnett theory
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