本論文主要是探討外加電壓對於摻雜染料液晶薄膜(DDLC)之光配向的影響。我們利用實驗室先前的研究成果---偶氮染料分子快速吸附在高分子基板表面的特性，做成一相位光柵；在光柵形成過程中，外加一電壓研究其對樣品的影響，並針對一階繞射相對應於外加電壓的量值大小與頻率之變化性做量測。

　　實驗中發現在外加較高頻率電壓範圍下，雖然外加電場後，提升了染料分子對激發光源的吸收也因此加快了吸附的速度，但仍須輔以較弱的激發光強度，以免造成過快的吸附速度，影響染料吸附的結構。而當外加較低頻率電壓範圍，因為sample 內空間電荷影響所導致液晶分子的流動現象，更加速了染料分子吸附，造成過快的吸附速度，形成聚集雜亂的結構。

　　綜觀以上結果：外加電壓的確更加快染料分子的吸附，但要達到快速吸附且完美的結構就必須輔以一些重要實驗條件。而在以往摻雜染料之液晶光配向的研究領域中，似乎還沒有人針對外加電壓對於DDLC cell 之影響做過相關研究，因此本論文研究對液晶光配向之電效應的探討是有所助益的！！

This work reports the voltage effect on the photo-alignment in dye-doped liquid crystal (DDLC) films. A grating based on a DDLC cell was fabricated using photo-alignment methode. The effect on the photo-alignment by applying a voltage during the formation of the grating was studied. In addition, variations of the first-order diffraction of the formed hybrid grating with the frequency and the amplitude of the applied voltage were measured.

　　By applying voltage, the absorptivity of dyes for a pump beam truly enhanced and promoted the adsorption rate of dyes. In high frequency voltage part, the too fast adsorption rate of dyes resulted from the enhancement of absorptivity of dyes for a pump beam. It resulted in the aggregation and disorder of the adsorbed dye. The sample had to be irradiated with the weak intensity by a pump beam if it was applied high frequency voltage. However, the electrohydrodynamic instability in the liquid crystal molecules with a negative dielectric anisotropy, which induces distortions of liquid crystals, and resulted in the segregation of spaced charges. The space charges interact with the applied field causing the LCs flow. The flow is accompanied by a shear stress, and then the shear-induced torque. And it caused the more fast adsorption rate of dyes than which was in high frequency domain. Consequently, it also resulted in aggregate and disordered adsorption of dyes.

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