近年來國際間許多研究團隊針對藍相液晶(blue phase liquid crystals)的特性進行著許多的研究，如藍相液晶存在之溫度範圍、選擇性反射等。本研究則是探討在不同的液晶狀態或不同溫度下，照射不同強度的線偏振綠光雷射(波長為532 nm)使甲基紅(methyl red，簡稱MR)於基板上形成不同的表面吸附結構，進而探討吸附效應對偶氮染料摻雜藍相液晶之影響。而在入射特定光強度以上的光束時，則可得到擴展藍相液晶存在溫度的結果。根據實驗結果，入射光強度愈強，所形成MR吸附可得到較佳的擴展效果。除發現MR表面吸附會使藍相液晶寬溫之外，此外，液晶盒的厚度亦影響溫寬擴溫效果，MR吸附於較小厚度之液晶盒基板表面，所得到的寬溫效果愈好。在本研究結果中，利用較小液晶盒厚度與配合適當光強度的綠光雷射使MR吸附，將可擴展藍相液晶溫寬約7.5°C的成果。而由SEM圖象所呈現出基板的MR吸附情況，發現MR吸附的形構對藍相液晶的存在溫寬是值得注意的。再者，基板上的吸附結構形態亦對藍相液晶之反射波長有所影響，其反射波長會隨著不同強度雷射光變化，其反射光會被固定於不同特定波長。實驗中呈現入射光強度愈強，則藍相液晶反射波長會被移動(藍移)且固定。最後，我們亦提出其機制模型用以說明本研究所發現之現象，因此本論文之成果對藍相液晶之技術發展應有一定程度的助益。

In recent years, many scientists have paid much attention to the electro-optical (E-O) properties of the blue phase liquid crystals (BP-LCs), such as the temperature range, selective reflection, and others. In this study, we report that the adsorption effect of azo dye-doped in BP-LCs on the E-O and optical properties of BP-LCs. The structures of methyl red (MR) adsorption, produced by irradiating a green laser (wavelength: 532 nm) having different intensity onto the dye-doped BP-LCs vary with different cell temperature and/or at different phase. If the intensity of used green laser beam is high enough, the temperature range of BP-LCs can be extended significantly. According to the experimental results, the higher intensity of the pumping light is used, the wider the extended temperature range can be obtained. Additionally, the cell gap of the LC cell is another key to affect the temperature range of BP-LCs. The extended temperature range resulting from the adsorbed MR onto the surfaces of a LC cell having a thinner cell gap is wider than that with a thicker cell gap. It is demonstrated in this study that the extended temperature range of the BP-LCs by MR adsorption in above optimum conditions is about 7.5 °C. Based on the SEM images of the adsorbed MR on the substrates, it is found that the morphology of the MR adsorbed layer affects the temperature range of BP-LCs significantly. Moreover, the adsorbed MR morphology onto the substrates will affect the reflection wavelength of the BP-LCs, which is found to be shifted and fixed at a specific wavelength dependent on the intensity of the pumping green light. The experimental results show that the shift (blue-shift) of the reflection wavelength increases with the intensity of the pumping green light. Finally, the model is proposed to explain the experimental results. It is believed that the results obtained in this thesis should benefit the promotion of BP-LC technology.

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