Abstract
This theoretical work presents a comparative study of the optical properties and spectral tunability of hybrid multilayer spherical and cylindrical nanoshells based on the quasi-static approximation of classical electrodynamics. The interband transitions have been considered using the Drude–Lorentz model for the complex dielectric function of metallic layers because the optical properties of metals arise from both the optical excitation of interband transitions and the free-electron response. A general formula for N-ayer concentric nanoshells is arranged, and numerical calculations are performed for the four-layer nanoshells as an example. We have analyzed in detail different configurations of nanoshells such as dielectric-metal-dielectric-metal with dielectric core, metal-dielectric-metal-dielectric with metal core and semiconductor-metal-dielectric-metal with semiconductor core because composition of nanoshells have dramatic influence on their optical properties. The absorbance spectrum behavior of the shell thicknesses, surrounding medium, shape and composition of each layer of the nanoshell is numerically investigated.
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Acknowledgements
Some of numerical calculations of this work has been performed at the Parallel Computing Laboratory, Department of Physics, University of Razi. We would like to thank head of laboratory, Dr. Mehdi Tabrizi for his excellent cooperation of this research.
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Daneshfar, N., Bazyari, K. Optical and spectral tunability of multilayer spherical and cylindrical nanoshells. Appl. Phys. A 116, 611–620 (2014). https://doi.org/10.1007/s00339-013-8188-z
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DOI: https://doi.org/10.1007/s00339-013-8188-z