利用自製光纖探針作用在配向膜上對液晶配向研究

Abstract

利用液晶製成的微小光學元件在微機電的應用上有很大的潛力，此技術需要能在局部的小區域對液晶配向，但是傳統的磨刷高分子薄膜進行配向之方法則難以達成。 在本論文中，我們使用自製蝕刻的雙尖式探針來模擬絨毛磨刷在配向膜表面上的情形。我們可以控制製程參數來得到不同斜率以及粗細的針頭。利用三軸平移台以及旋轉台精密的調整探針和配向膜表面的接觸力量，角度與距離，作用後可以得到不同的表面結構，進而量測到不同配向條件。其次改變探針作用的週期，並製作成液晶樣品後觀察不同週期的區域與表面定向強度的關係。

The surface of substrate plays an important role in liquid crystal devices. Rubbed polymer layers are widely used to control the alignment of LC molecules, but the small area and multi-domain alignments can not be achieved. If the alignment of small area can be achieved, the application of small LC components will be much further extended and the functionality of Micro-electromechanical system (MEMS) can be increased by including LC components We develop a new LC alignment method (the fiber tip method) to align LC on a small specific areas The single etched fiber tip is used to scribe the polyimide (PI) coated substrate to make grooves on PI. The fiber is fixed on a 3-axes linear stage. By controlling the speed of fiber movement , the distance and angle between the fiber and the PI surface, we can get grooves with various micro structures and periods. In this work, we measure the anchoring strength, transmissions, and the pretilt angle in different conditions and determine the alignment effect with respect to the scribing conditions.