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. 2016 May 3;6:25348. doi: 10.1038/srep25348

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Copyright © 2016, Macmillan Publishers Limited

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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(a) Schematic illustration of the microfabrication process of the stretchable Fresnel lens (not to scale); (b) Fabricated device containing 2 × 2 lens units (f = 7 mm), with each unit size 6 × 6 mm²; (c) Optical microscope image of one lens; (d) Tilted SEM image of the diffractive CNT pattern, the inset shows a close up view of the vertically aligned CNT which are 10 μm in height (before PDMS percolation); (e) SEM image of the CNT with the PDMS percolated thoroughly into the CNT bundles; (f) The measured transmittance of the transparent PDMS area and the opaque CNT/PDMS area, with glass as reference. The PDMS has a transmittance of 93.9%, higher than glass (91.8%), while the CNT/PDMS has transmittance of 0.06%.