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. 2017 Jul 14;6(7):e17011. doi: 10.1038/lsa.2017.11

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Copyright © 2017 The Author(s)

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/

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Large-area uniform chiral microstructures with controllable sizes using the optimized parameters. (a) SEM images of chiral microstructures with three spiral lobes achieved for different values of laser power and exposure time. (Scale bar, 5 μm) (b) Quantitative study of the diameter of the chiral microstructure as a function of exposure time and power. Error bars are the s.d. of three fabrications using the same parameters. (c) Optical image of a square area with 2D grating-like chiral microstructures has structural color, with a period of 20 μm. (d) SEM image of the arrayed chiral microstructures; inset is a magnified view. (e) Diffraction pattern fired by a laser with wavelength of 532 nm on the square area. s.d.: standard deviation.