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. Author manuscript; available in PMC: 2021 May 27.
Published in final edited form as: Adv Mater. 2020 Jan 16;32(9):e1903862. doi: 10.1002/adma.201903862

Figure 2.

Figure 2

Design parameters to consider for high-aspect-ratio nanostructured surfaces that act as biological metamaterials. These are: (A) geometry, including the height, tip-width and base-width of the nanostructure; (B) the spacing between nanostructures; (C) the uniformity of the spacing of the nanostructures (are the nanostructures spaced with a regular periodicity, or stochastically?); (D) the presence of any secondary structure, for example the use of porous materials; (E) the underlying bulk material (e.g. silicon, gold, polymer, etc).