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. 2015 Nov 27;5:17340. doi: 10.1038/srep17340

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This work is licensed under a Creative Commons Attribution 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/4.0/

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All images were taken in white light. The picture size is 190 μm × 190 μm. The maximum retardance is 5 nm. The left photo (a) depicts a case with crossed linear polarizer and analyzer. The middle image (b) illustrates a case with full-wave plate inserted into the optical path. The right picture (c) shows polarization polychromatic image with the brightness corresponding to retardance and hue representing the principal (birefringent) axis orientation.