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. 2018 Feb 20;8:3351. doi: 10.1038/s41598-018-21627-z

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© The Author(s) 2018

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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(a) The calculated CD spectra of the metal nanocrescent with the increase of θ. (b,c) Sketch of the optimum electric field distribution on the surface of the nanocrescent of circularly polarized light to excite dipole and tripolar modes, respectively. The black arrows show the polarization direction of pump light. The red dashed lines stand for positive charges and blue dashed lines stand for negative charges.