Fig. 2: Stretch-induced self-growth of straight micropillars.
a Laser confocal image of straight micropillars fabricated with increasing scanning circles from 1 to 80 on the biaxially stretched membrane (stretching ratio λ = 1.67). b Corresponding cross-sectional profiles of straight micropillars shown in (a). c Experimental results of micropillar height and diameter as a function of laser scribing depth. d Laser confocal image of microstructures in (a) after completely releasing the membrane. e Corresponding cross-sectional profiles of microstructures shown in (d). f After releasing the membrane, the experimental results of micropillar height and diameter as a function of laser scribing depth. Contour maps of micropillar height (g) and diameter (h) as functions of both laser scribing depth and stretching ratio. Comparison between experimental and simulated results of micropillar height (i) and diameter (j) under five experimental conditions: H2 = 60 μm, λ = 1.18; H2 = 80 μm, λ = 1.27; H2 = 100 μm, λ = 1.34; H2 = 120 μm, λ = 1.54; H2 = 140 μm, λ = 1.67. Quantitative relationships between micropillar height (k) and diameter (l) with the stretching ratio at different laser scribing depths according to the simulation results. Error bars represent the standard deviation of three independent measurements.
