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(a) Schematic diagram and photograph of the paper-based metamaterials. (b) The measured transmission spectra of paper-based metamaterials coated with a series of glucose solutions with different concentration . Reproduced with permission from H. Tao et al., Adv. Mater. 23, 3197 (2011). Copyright 2011 Wiley. (This figure is subject to copyright protection and is not covered by a Creative Commons Commons license.)
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