This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. We are developing a Fourier domain reflectance phase imaging microscope. A common-path phase-referenced detection scheme allows angstrom-scale measurements of cell displacements at kHz bandwidths. Birefringent optics enable high transverse and longitudinal resolution. Two-dimensional imaging can be performed by scanning the sample or the beam. Reflection phase measurements will be used to measure small phase shifts and membrane fluctuations which are known to accompany electrical activity in neurons and nerve fibers.
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