Abstract
High bandwidth interdigitated probes have enabled high-speed mapping of elastic properties of various samples in air. To extend this capability to imaging in fluids, we implemented a signal processing scheme to calculate the tip-sample interaction force as well as elastic properties from high-frequency photodiode signals. Using this method, we imaged a styrene-(ethylene/butylene)-styrene copolymer sample submerged in water and obtained spatial maps of elastic properties as well as maps of higher harmonics of the motion of the tip. We observed that multiple physical quantities contribute to the contrast observed in the phase and higher harmonic images.
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