Abstract
We report an approach of controlling liquid crystals using a laser beam without external bias. In our design, in addition to liquid crystals, a patterned semiconductor was also included. We discovered that the average pretilt angle of liquid crystals can be controlled by adjusting excitation power, and the relationship was found to follow the possible predicted photovoltaic effect. Besides, the photogenerated field was found to have both perpendicular and horizontal components, which is very useful to control the orientation of liquid crystals to an arbitrary direction. Optical switch devices can be possible to design using our method.
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