在染料摻雜液晶薄膜中利用雷射光激發使偶氮染料吸附在相關表面上的應用在最近已被廣泛地研究。在本論文中，我們將偶氮染料摻雜在液晶的薄膜裡，並且把此液晶薄膜加熱到各方勻向性，觀察在不同強度光之照射下，染料在此液晶盒兩片玻璃上之配向效果，找出合適的染料吸附條件，以製成雙面水平配向之液晶盒。在此一系列的實驗中，我們再度驗證了偶氮染料分子(Methyl Red)在弱光的作用沿著垂直於激發光場之偏振方向吸附，此外也證明偶氮染料在各方勻向性之液晶盒裡，受到適當強度的光之激發可同時在液晶盒的雙面玻璃基板上吸附。之後我們再利用此種雙面配向技術，以及分別用光罩及偏振全像干涉方式，製造出兩種水平配向之液晶光柵，並且在量測這兩種液晶光柵之繞射性質後，証明此兩種液晶光柵為與偏振無關(Polarization-independent)之電控分光器。

The applications of photo-induced dye adsorption in dye-doped liquid crystal(DDLC) film for liquid crystal(LC) alignment using single pump beam have been extensively studied recently . In this thesis, we heat a DDLC cell to isotropic and pump the LC cell with various intensity to make a homogenous alignment. We observe dye absorption on the two ITO glass substrates in LC cell pumped with different intensity , and optimize the conditions to make a good homogenous alignment. We verify that the azo dyes(Methyl Red) in DDLC films pumped by a low-power beam are adsorbed with their long axis perpendicular to the polarization of the pump beam. In addition, we prove that azo dyes in the isotropic LC cell can adsorb on two glass substrates pumped with a suitable intensity. Based on the optimized conditions we fabricate a LC grating using a photomask, and a continuous homogenous LC grating using a polarization hologram. The measured results show that the diffractive property of these two kinds LC gratings, are polarization independent, and can be used as an electrically tunable beam splitter.

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