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In recent years the control of molecular orientation by a polarized light has attracted considerable attention in the field of optical and electronic devices consisted of liquid crystalline compounds. Three basically different methods which were based on cis-trans conformational transition [1], photo cross-linking [2] and photo degradation of polymer [3], have been presented for orientation of liquid crystals. These methods are applicable to align liquid crystalline polymers (LCP) which are also one of the most expecting materials for optelectronic devices. We reported a new method for a fabrication of the LCP films whose molecular orientation can be controlled in a micrometer size.[4] The present method was based on two processes, i.e., exposure of linearly-polarized laser to polyimide (PI) under layer and LCP film deposition by using laser chemical vapor deposition. The alignment of LCP was thought to be induced by photo degradation of PI chains whose direction were parallel to the polarization of pre-exposure laser. Therefore, photo degradation of PI was one of the major factor to control the orientation of LCP. The sensitivity of PI toward UV illumination was decreased with increasing the imidation.[5] It was expected that higher orientation could be achieved for the deposition on the lower imidized PI layer. In this letter, we report the results of deposition of LPC on pre-exposed PI layer having two different imidation.

Micron-sized control of molecular orientation of liquid crystalline polymer films by using linearly-polarized UV laser.