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Experimental results are recorded from nerve bundles dissected from crayfish walking leg using a phase-sensitive optical low coherence reflectometer.
We demonstrate non-contact sub-nanometer optical measurement of neural surface displacement associated with action potential propagation. Transient neural surface displacement is less than 1 nm in amplitude, 1 ms in duration and is coincident with action potential arrival to the optical measurement site. Because the technique uses back-reflected light, noninvasive detection of various neuropathies may be possible. Keynes, “Light scattering and birefringence changes during activity in the electric organ of electrophorus,” J.
Tanifuji, “Novel functional imaging technique from brain surface with optical coherence tomography enabling visualization of depth resolved functional structure in vivo,” J. Boppart, “Functional optical coherence tomography for detecting neural activity through scattering changes,” Opt.