Light-field-induced spatially periodic freedericksz transition in a planar nematic cell |
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Authors: | M F Ledney |
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Institution: | (1) Shevchenko National University, Kiev, 03689, Ukraine |
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Abstract: | It is shown that a threshold spatially periodic reorientation of the director by a light field is possible in a planar nematic liquid crystal cell if the ratio of the Frank elastic constants, K 2/K 1, exceeds a critical value. The periodic director structure arising in the cell leads to a self-diffraction of the incident light wave. The dependences obtained for this phenomenon make it possible to determine the values of the elastic constants K 1 and K 2, the director reorientation threshold, and the period of the director structure from the experimental values of the self-diffraction angle. |
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