Abstract.
We investigate the effects produced on the diffraction pattern of a dyed nematic thin film under the action of an optical field and a low frequency AC electric field. For a homeotropically aligned mixture of the nematic E7 doped with a dichroic dye, a sequence of dynamical regimes of the far field diffraction pattern is observed. For specific values of the beam's power, frequency and amplitude of the AC field, a uniform steady rotational motion (SR) of the pattern sets in with a measured angular velocity νexp =2.58 Hz. To account for this and other observed features of the diffraction pattern an analytical model is proposed. This allows us to describe quantitatively the reorientation of the film, to calculate some specific structural features of the diffraction pattern, as well as its angular velocity. We find that the predicted angular velocity νtheor=5.7 Hz, is in quite good agreement with the measured value.
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Rodríguez, R., Reyes, J., Fujioka, J. et al. Thermally induced effects on the diffraction pattern of a dye doped nematic film. Eur. Phys. J. B 55, 411–418 (2007). https://doi.org/10.1140/epjb/e2007-00081-y
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DOI: https://doi.org/10.1140/epjb/e2007-00081-y