Fig. 4

a The originally wide-field pattern of the excitation light gets scrambled after traveling through scotch tape. b–d Changing the phases of different parts of the incoming light provides constructive interference of the scattered light paths. The intensity within the region of interest increases while the algorithm optimizes the spatial phase distribution of the incoming light. The images are taken with detection objective 1 having its focal plane set 1 mm behind the turbid medium. The colorbar in arbitrary units is valid for all the subfigures. e Intensity profiles over the line-shaped regions in subfigures (a) and (d). The arrows indicate the starting and ending points of the line plots. The average intensity within the ROI in (d) is ~ 12 times higher than the average intensity in (a)