(a) BF, (b) DF, and (c) PM images of the silica microsphere monolayer observed with the 60× objective lens (Scale bars: 10 μm). A, B, C: domains of different packing orientation. D: a defect line. (d) PM images of the single or triple microspheres. Crossed polarizer axes are designated by the arrows (Scale bar: 2 μm).
Simulated PM images based on the crystalline ordering direction of microspheres. (a) A microsphere is represented as four white arcs with its outer diameter 20% larger than the center-to-center distance of two contacting microspheres. Brightness of the overlapped region depends on the contacting orientation. (b–d) Simulated PM images of the close-packed microsphere monolayers corresponding to the regions A, B, and C of Fig. 1(c) . Insets show the crystalline ordering direction in each region.
BF, DF, and PM images of the silica microsphere multilayer observed with the 10× objective lens (Scale bars: 50 μm). The brightness (gray values) profiles for the cross-section (red solid line) of each image were plotted with an indication of the number of layers for each region. The number of layers in each region was confirmed through the reflection mode of the upright microscopy by changing focus (Fig. S5). 11
Two possible stacking structures for the close-packed triple layer of microspheres.
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