Domain walls (DWs) in ferroelectric materials are of highest interest as integrated functional elements, for instance in optoelectronic nanodevices. We investigated individual ferroelectric DWs in periodically-poled LiNbO3 single crystals by applying polarization-sensitive optical coherence tomography (PS-OCT). Comparing our experimental results with circular light polarization to simulations, we conclude that the three different signals recorded from each DW are associated to both the ordinary and extraordinary refractive index, and to a third contribution that arises from the mean value of the two. PS-OCT hence provides a valuable tool to probe the relevant electro-optical properties close to and at the DWs.
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