Abstract
The reflection notch of cholesteric liquid crystals can be controlled using near infrared light (NIR) irradiation, and is demonstrated in this work. Opto-thermal tuning of a liquid crystal mixture near a SmA → CLC transition is achieved through use of a NIR absorbing dye, PBIBDF-BT, which can yield large changes in the spectral reflection. Compared to ultraviolet (UV) and visible light, employing NIR light is beneficial because of its invisibility, outstanding penetration for temporal and spatial remote activation of materials, and more. A simple fabrication method involving the addition of infrared absorbing dye into one of the alignment layers of a liquid crystal cell is presented. The tuning range and speed are dependent on the NIR light power, wavelength, and infrared absorbing dye concentration. Furthermore, RGB3-element color can be achieved by adjusting the NIR light power.
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