In optics, a "domain wall" typically refers to a boundary between two different regions of a material where the optical properties change, often associated with phase transitions or other phenomena. This concept is similar to the idea of domain walls in magnetism, where they separate regions of differing magnetic orientations. In the context of nonlinear optics, domain walls can play a significant role in systems with spatial or temporal modulation of refractive index, leading to phenomena such as solitons or localized modes.
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