Abstract
Photothermal effects in nematic liquid crystals (NLCs) on a dye-doped polymer film are investigated using a crystal rotation method combined with a pump-probe technique. We consider both the temperature dependence of the refractive indices of the NLCs and reorientation of the NLC molecules due to a temperature rise at the polymer surface. The photothermal birefringence change is proportional to the pump beam intensity. The photothermal effects strongly depend on the nematic-isotropic transition temperature (TNI) of the NLCs. The proportional constants increased with decreasing TNI of the NLCs and the values for E44 (TNI=100 °C), E7 (59 °C), and 5CB (35 °C) are estimated to be −1.2×10−4, −2.8×10−4, and −2.6×10−3 (/mW), respectively. In addition, the pretilt angles of a 5CB cell are changed by the irradiation of the pump beam.
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