Figure 4
From: Shrinkable silver diffraction grating fabricated inside a hydrogel using 522-nm femtosecond laser
Bright-field microscope images of silver gratings fabricated inside the hydrogel. The spacing between adjacent lines in these patterns was (a) 10 μm, (b) 5 μm, and (c) 2 μm. The laser power and the scanning speed used for fabrication were 16.5 mW and 200 μm/s, respectively.
