Figure 2. Characterization of hydrogel patterning.

(A) Absorbance of collagen hydrogels with and without nanorods, compared to nanorods in aqueous solution. The laser wavelength is also highlighted (800 nm). (B) Representative brightfield images of the patterned lines at different writing speeds 0.25, 0.75, and 2.0 mm/s at 100 mW laser power. Characterization of patterned line widths in response to various writing speeds (0.25, 0.75, 1.25, 1.5, 1.75, 2.0 mm/s) and laser powers (100, 150, 185, 290 mW)