On the dependence of circular Bragg phenomenon of noble metals helicoidally periodic sculptured thin films on visible and IR wavelengths |
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Authors: | Ferydon Babaei |
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Institution: | a Department of Physics, University of Tehran, North-Kargar Street, Tehran, Iran b Thin Film Centre, University of Paisley, High Street, Paisley PA1 2BE, UK |
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Abstract: | The concept of local homogenization in the visible and infra-red frequencies is used by estimating the permittivity dyadics of noble metals (Cu, Ag, and Au) in the form of thin film helicoidal bianisotroptic media (TFHBM). Despite the fact that the absorption transitions of dielectric to metal (percolation threshold) in metallic TFHBMs occur at long wavelengths at lower volumetric fraction of metallic particles, at these wavelengths the transition from dielectric to metal in composite relative permittivity scalar occurs at higher volumetric fraction of metallic particles. The latter is responsible for the increase of circular Bragg phenomenon. |
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Keywords: | Helicoidal periodic mediums Sculptured thin films Percolation threshold Circular Bragg phenomenon |
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