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. Author manuscript; available in PMC: 2022 Jun 20.
Published in final edited form as: Opt Lett. 2019 Aug 1;44(15):3645–3648. doi: 10.1364/OL.44.003645

Fig. 7.

Fig. 7.

(Visualization 2) Test of the PSM approach using a thick PDMS sample mixed with microspheres. (a) Back-propagated object amplitude at four axial positions. (b) The recovered 3D positions of microspheres by locating the intensity minimums of the back-propagated wavefront at different z positions.