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. Author manuscript; available in PMC: 2018 Jan 5.
Published in final edited form as: Adv Funct Mater. 2016 Nov 2;27(1):1604281. doi: 10.1002/adfm.201604281

Figure 5. 3D structures with potential utility in tunable optics and stretchable electronics.

Figure 5

(a) A 3D concave mirror enabled by assembly using engineered substrates. The left two frames show overlaid experimental and FEA images of structure at 0 and 40% biaxial strain. The right frame shows change of simulated focal locations as a function of stretching levels, and comparison with ideal focal locations for the corresponding fitted concave surfaces. (b) A 3D helical coil elevated from the substrate. The left two frames show the experimental and FEA results of the structure at 0 and 30% strains. The middle frames show 3D and cross-sectional views of the substrate, as well as the magnitude of the x-direction normal strain for 30% applied biaxial strain. The right frame shows a top view of the helical coil upon 30% biaxial stretching, with and without the use of an engineered substrate. The colors in the FEA results indicate the magnitude of out-of-plane displacements. Engineered substrates in (b) are shown with 30% translucency. Scale bars, 1 cm.