在染料摻雜液晶薄膜中利用單色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，我們將雙光子(紅光及綠光)效應應用在偶氮染料摻雜液晶的薄膜裡，觀察不同強度與不同溫度下由雙光子效應所造成的吸附、聚集以及分離的效應，並利用掃瞄式電子顯微鏡觀察其吸附染料形成之波紋結構與光強度及溫度的關係。在這一系列的實驗中，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；更證實了紅光及溫度皆可抑制綠光對偶氮染料分子的吸附作用，此外，也證明了不同偏振的光，對雙光子效應造成不同程度的影響。我們亦提出了紅光與溫度皆可造成聚集的染料分子發生分離現象的機制。最後，我們針對在掃瞄式電子顯微鏡下觀察到染料吸附後形成之波紋結構的波紋間距及其結構加以說明，並以簡單的數值方法加以驗證之。因此，本論文中我們已說明了雙光子效應的種種機制，對往後在此系統中的其他實驗立下穩固的根基。

The applications of dye adsorption in a dye-doped liquid crystal (DDLC) film by using single pump beam have been extensively studied in recent decades. In this thesis, we study the biphotonic (red and green light) effect based on the DDLC films, and observe the adsorption, aggregation and separation phenomena. The formed patterns under different intensities of two laser beams and temperatures are investigated. Specifically, the relations between the laser-induced ripple structures of adsorbed dyes are observed using a scanning electron microscope (SEM). We conclude that the direction of the adsorbed azo dyes (Methyl Red) in DDLC films pumped by a low-power excited beam is perpendicular to the polarization of excited beam. In addition, we prove that the red light and temperature can restrain the green light from causing the adsorption of azo dyes. Moreover, different polarization of excited beams can cause some different biphotonic effects. We propose the mechanism that accounts for the separation phenomenon of aggregated dyes, and for the ripple structure of the adsorbed dyes observed under SEM. An easy numerical method is also give to prove the phenomena.
Based on the obtained results, some further experiments in this system are designed and given in the conclusion chapter.

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