Thermally induced effects on the diffraction pattern of a dye doped nematic film

R. F. Rodríguez (), J. A. Reyes, J. Fujioka, E. Cortés, J. A. Olivares and F. L.S. Cuppo

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 55, issue 4, 411-418

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 ν exp =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 ν theor =5.7 Hz, is in quite good agreement with the measured value. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Keywords: 78.20.Nv Thermooptical and photothermal effects, 61.30.Gd Orientational order of liquid crystals; electric and magnetic field effects on order, 42.65.-k Nonlinear optics, (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1140/epjb/e2007-00081-y

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