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. 2017 Aug 9;7:7696. doi: 10.1038/s41598-017-08077-9

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Scattering cross section and absorption cross section of a 100 nm Au nanosphere with (a) Coating thickness t = 10, 20, 30, 40 nm. (b) With refractive index of coating dielectric n = 2, 3, 4, 5. Angular scattering (a. u.) of (c) a 100 nm Au nanosphere with coating thickness t = 10, 20, 30, 40 nm. The refractive index of coating dielectric index n is set as 3. (d) 100 nm Au nanosphere with n = 2, 3, 4, 5; t = 10 nm. The Y-axis value is square of the scattering intensity. Calculated scattering-to-absorption cross section (S) as (e) the function of t with n = 3.4 and a 120 nm Au core. (f) As the function of n with t = 15 nm and a 120 nm Au core.