Fig. 4: Gallery of selected polymeric chiral tetragonal mechanical metamaterial samples following the design shown in Fig. 1.
From: Large characteristic lengths in 3D chiral elastic metamaterials
a–d Optical micrographs of samples with N = 1, 2, 3, 6 fabricated using the Nanoscribe 3D printer. a N = 1, scale bar: 100 µm. b N = 2, scale bar: 200 µm. c N = 3, scale bar 300 µm. d N = 6, scale bar: 600 µm. e Scanning electron micrograph of one unit cell of the sample with N = 6 depicted in d, scale bar: 40 µm. f–i Optical micrographs of samples with N = 6, 9, 18, 27 fabricated using the multi-focus multi-photon 3D printer. f N = 6, scale bar: 300 µm. g N = 9, scale bar: 450 µm. h N = 18, scale bar: 900 µm. i N = 27, scale bar: 1350 µm. j Zoomed-in scanning electron micrograph of the sample with N = 27 depicted in i, scale bar: 300 µm.
