Fig. 5. Images from the (a) top, (b) side, and (c) bottom, which were collected through the red channel (625–675 nm) at every 2 μm of depth under excitation at 900 nm. (A–F) z-Direction cross-section images at different depths from the top. The laser power was gradually increased from 5 mW to 50 mW (compensation excitation). The field of view (FOV) was 775 μm × 775 μm.
