本論文主要探討於藍相液晶中摻雜不同濃度偶氮手性染料之相關光調控光學特性。第一部分討論摻雜不同濃度(0‒5 wt%)偶氮手性染料於藍相液晶中的藍相性質差異，接著討論在有無額外做水平配向條件下之藍相特性差異。實驗結果顯示經過表面配向處理之樣品，其藍相溫寬較無配向樣品額外寬了30%，此結果證實表面配向力具有穩固藍相晶格之作用。第二部分實驗乃延續第一部分之實驗結果並結合光控系統，以短與長波長之光源照射樣品，藉此引致染料分子分別發生trans-cis與cis-trans光致異構化反應，藉以光控的方式可逆調控藍相-各方同向液相之間的相態變化。實驗結果發現以配向基板搭配高濃度偶氮手性材料摻雜之藍相液晶具有發展光切換藍相-各方同向液相開關之淺力；而無配向樣品搭配低濃度偶氮手性材料摻雜之藍相液晶則可用於光調控藍相反射波段，藉此可發展光切換或光調控藍相液晶雷射或感測元件等。

This thesis mainly investigates the optical tuning properties of doping different concentrations of azo chiral dyes in blue phase liquid crystals (BPLCs). The first part discusses the difference in the BP properties of different concentrations (0‒5 wt%) of azo chiral dyes in BPLCs, and then discusses the difference in BP characteristics with or without homogeneous alignment. The second part is to perform the optical tuning experiment with the light control system by the illumination of the sample with short and long wavelength light sources, thereby causing the tran-cis and cis-trans isomerizations of the dye, respectively. The controlled mode reversibly regulates the phase change between the blue phase and the isotropic phase.

Keywords：blue phase liquid crystals、azo chiral dyes、trans-cis isomerization

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