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The state of polarization of light is strongly affected by anisotropy and exotic polarization phenomena can be observed in systems where this anisotropy emerges on symmetric and ordered structures on the wavelength scale, as occurs in metamaterials [1, 2] and periodically-poled multiferroic media [3]. In recent studies, conditions have been found in which the dipolar mosaic characterizing disordered...
We report the spontaneous formation of a volume cubic grating in ferroelectric KLTN. Diffraction indicates a 3D linear, electro-optic, and nonlinear structure with lattice constant 10000 times larger than the underlying perovskite lattice.
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