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. 2020 Jun 29;11(7):641. doi: 10.3390/mi11070641

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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One unit cell of the Au nanospiral structure is modelled with periodic boundary conditions to simulate an infinite 2D array. The right circularly polarized (RCPs) and left circularly polarized (LCPs) were illuminated through the lower port of the unit cell and the transmitted light intensity was acquired at the upper port of the unit cell. (a) Transmission spectra of the Au nanospiral structures as a function of height h_sp. (b) An overview of the unit cell containing the Au nanospiral structure.