Abstract
Light deflection phenomena in an antiferroelectric chiral smectic liquid crystal MHPOBC were investigated. At electric field induced phase transitions between antiferroelectric (AF) state to ferroelectric (F) one, characteristic deflected lights were observed; dependence of the angle of deflection on temperatures and on angles of incidence were quite different from those of diffraction lights due to a periodical change of refractive index caused by helical structure of chiral liquid crystals. On the basis of numerical analysis for domain walls of ferroelastic crystals, it is concluded that the light deflection is due to refraction and reflection phenomena at the phase boundaries between AF and F states coexisting at the field induced phase transition.
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