本文針對不同濃度手徵性分子加入向列型液晶後所形成的藍相液晶(Blue phase)，手徵性分子濃度與藍相液晶反射光波長的關係進行探討。藉由反射光譜與晶格繞射法相互驗證的實驗結果顯示，藍相液晶的反射波長受晶格方向與晶格常數影響，使得藍相的反射波長與手徵性分子濃度(螺旋強度)不呈線性關係。隨著手徵性分子在液晶中的濃度增加，藍相液晶的晶格常數因螺旋強度增強而縮小，因此反射波長往短波長位移；但當晶格面的方向改變，便會使BPI的反射波長往長波長方向位移，這樣的結果使得BPI的反射波長與手徵性分子的濃度(螺旋強度)不為線性關係。

In this study, we explore the relationship between reflection wavelength and chiral concentrations in blue phase I (BPI). Based on our experiments, the reflection wavelengths in BPI are dominated by the lattice plane of the platelets and the lattice parameter of a unit cell, but they do not depend linearly on the chiral concentration. The reflection peak moves to a short wavelength as the chiral concentration increases because of the contraction of the lattice constant. However, when the lattice plane is changed, it dominates the reflection, and it may move to a longer wavelength. These results are also confirmed by Kossel diagrams.

致謝………………………………………………………………………. i
摘要……………………………………………………………………… iii
Abstract………………………………………………………………….. iv
目錄……………………………………………………………………... v
圖目錄………………………………………………………………….... vii
表目錄…………………………………………………………………… x
第一章 緒論…………………………………………………………….. 1
1-1 膽固醇相(Chiral Nematic, Cholesteric Phase；N*)……. 1
1-2 藍相液晶(Blue Phase；BP)…………………………….. 4
1-2.1 藍相之光學特性…………………………………. 5
1-2.2 藍相液晶之電學特性……………………………. 6
1-2.3 藍相液晶相態判別………………………………. 8
1-2.4藍相液晶溫度範圍之拓寬………………………. 10
1-3 本文研究目的與動機 ………………………………… 10
第二章 理論…………………………………………………………… 12
2-1 藍相缺陷線自由能理論………………………………. 12
2-2 膽固醇液晶之選擇性反射……………………………. 13
2-3 米勒指數(Miller index)………………………………… 16
2-4 藍相液晶之反射機制………………………………….. 17
2-5 晶格繞射法(Kossel diagram)………………………….. 18
2-6 晶格方向推算………………………………………….. 20
2-6.1由反射光譜計算藍相的晶格面方向……………. 20
2-6.2 由Kossel diagram推算藍相晶格面方向………. 21
第三章 實驗方法……………………………………………………… 22
3-1 材料與樣品配置……………………………………….. 22
3-2 膽固醇相態下螺距對溫度的相依性之量測………….. 24
3-3 藍相相態鑑定………………………………………….. 25
3-3.1量測反射光譜判定藍相相態……………………. 25
3-3.2晶格繞射法(Kossel diagram)……………………. 27
第四章 實驗結果與討論……………………………………………… 29
4-1 液晶在不同相態下螺距和溫度的相依性…………….. 29
4-1.1膽固醇相下螺距和溫度的相依性………………. 29
4-1.2藍相下螺距和溫度的相依性……………………. 34
4-2 NYCL系統下手徵性分子濃度與BPI晶格方向之關係……………………………………………………….. 37
4-3 S811系統下手徵性分子濃度與BPI晶格方向之關係.. 49
第五章 結論……………………………………………………………. 52
參考文獻……………………………………………………………….. 53

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