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. Author manuscript; available in PMC: 2010 Dec 7.
Published in final edited form as: Opt Express. 2009 Dec 7;17(25):23114–23122. doi: 10.1364/OE.17.023114

Fig. 3.

Fig. 3

Scatterer response to different magnetic field strengths. Direct measurements (points) of maximum change in unwrapped phase from an average scatterer, which are directly proportional to the average maximum displacements of the MNPs, as the electromagnet control voltage is changed. The polynomial fit follows the law y=Cx1.7. The applied voltage is directly proportional to the gradient of the square of the magnetic field. MM-OCE data is acquired at displacements not exceeding 1.5 μm in order to avoid excessive phase wrapping of the phase signal.