Figure 5: CaCO₃ microlens arrays fixed on chitosan-coated substrates.

(a,b) The pictures of the same CaCO₃ microlens array-chitosan composite film coated on a cover glass were taken at different angles, which shows the antireflecting effect of the composite film. (a) Blue dashed line and red solid line indicate the locations of the cover glass and the CaCO₃ microlens array, respectively. (b) The picture was taken at the right angle when the cover glass reflects incident light. Only the area where the CaCO₃ microlens array was coated keeps transparency. (c) The picture of the composite film coated on a convex quartz glass lens in the form of compound eye. The red arrow indicates the uncoated part, which reflects light. Scale bars in a–c are 1 cm. (d) Overview of NIH3T3 fibroblast cell growth on the microlens array. Cells were stained with actin (green), and nucleus (red) with fluorescent dyes (overlay of fluorescent and phase contrast images). The scale bar is 100 μm. (e,f) Actin organization within the cell at higher magnification (e, overlay; f, green fluorescence). The scale bars are 20 μm.