Control of the molecular pretilt angle in liquid crystal devices by using a low-density localized polymer network

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摘要：

We developed a method to fabricate liquid crystal (LC) devices with variable pretilt angle (2–90°) which involves voltage application during the UV-light-induced polymerization of a photo-reactive monomer added in concentrations below 1%. Polymerization follows the application of the high voltage, which facilitates the motion of the monomer to the cell substrates. Control of the pretilt angle is accomplished through the formation of a thin polymer layer near the cell substrates, which stabilizes the LC orientation. The pretilt angle can be controlled over a small area of the sample, which allows for the fabrication of LC lenses and prisms.

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关键词：

Experimental/ liquid crystal devices optical polymers polymer dispersed liquid crystals polymerisation/ molecular pretilt angle liquid crystal devices LC molecular distribution low-density localized polymer network photo-reactive monomer cell substrates/ A7865T Optical properties of organic compounds and polymers (thin films/low-dimensional structures) A4270D Liquid crystals (optical materials) A4270J Optical polymers and other organic optical materials B4150D Liquid crystal devices B4110 Optical materials