Figure 6
From: Shrinkable silver diffraction grating fabricated inside a hydrogel using 522-nm femtosecond laser
Bright-field microscope images of silver gratings inside the hydrogel and the corresponding optical diffraction patterns obtained before and after shrinking of the hydrogel. The laser power and the scanning speed used for fabrication were 16.5 mW and 200 μm/s, respectively. (a) Bright-field microscope image of silver grating fabricated inside the hydrogel before shrinking. Spacing between the adjacent lines was 10 μm. (b) Optical diffraction pattern obtained with the silver grating shown in (a). Distance between the diffraction spots was ~6.2 mm. (c) Bright-field microscope image of silver grating after shrinking of the hydrogel. Spacing between the adjacent lines decreased to 8 μm from the original value of 10 μm. (d) Optical diffraction pattern obtained with the silver grating shown in (c). Distance between the diffraction spots was ~7.5 mm. White arrows in (b) and (d) indicate the diffraction spots.
