Abstract
Recently, we have presented the column instability under rectilinear oscillatory shear, and we have found the following facts: (a) By varying the shear frequency at fixed amplitude we have observed the quantification of the wave length distortion modes by the sample thickness. (b) By increasing the amplitude we provoke the undulation instability. In this work, we present the undulation of the structure, when the Hexagonal columnar liquid crystal (HCLC) is submitted to alternating shear excitation. We observe for the first time the wavelength modes using Rayleigh scattering. We discuss the obtained results in comparison with the mecano‐optic measurements of the band structure. These experiments give an accurate way to measure the spatial periodicity and the temporal frequency.
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