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. 2017 Apr 26;7:1199. doi: 10.1038/s41598-017-01266-6

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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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Numerical analyses of the spectral and electromagnetic behavior of the plasmonic structures using FDTD algorithm. (a) Calculated reflectance for the structures with (bottom) and without (top) back reflector, confirms the presence of multiple plasmonic resonances in both the cases. It is clear from the bottom figure that the strength of plasmonic light absorption increases with the presence of back reflector for both the resonances at (i) and (iii). (b) Electric field enhancement plots (top), time averaged power flow plots (middle) and Poynting vector plots (bottom) for the structure D = 260 nm with G = 160 nm at spectral positions marked in (a). (i) Dip 1 corresponds to the plasmonic resonance at 420 nm and it enhances the light absorption in to the substrate through the polymer nano pillar. (ii) Enhanced electric field due to the strongly radiating dipole resonance at 460 nm scatter coherently to form the strong reflective peak R_peak. (iii) The Dip 2 corresponds to a strong LSPR at 525 nm enhances the electric field around the nano hole which in turn facilitates increased light absorption in to the substrate. In all simulations normal incidence of plane wave was carried out with the electric field polarized in the x-axis and the k-vector in the z-axis pointing from above.