Abstract
The photothermal beam deflection technique is used to study a binary mixture of liquid crystals in a contact preparation. The photothermal signal is generated while scanning the contact preparation. The interphase boundaries between crystal-smectic A and smectic A-nematic are detected, and their displacement is monitored as a function of temperature. The theoretical analysis of the numerically simulated signal is presented. In particular the influence of the modulation frequency on the sensitivity in the detection of interphase boundaries is investigated.
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