請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/96481
標題: 具負介電異方性之藍相液晶電光特性探討
Electro-optical characteristic of amorphous liquid-crystal BPIII with negative dielectric anisotropies
作者: 吳鑌紘
Pin-Hung Wu
關鍵字: 介電異方性
霧狀藍相液晶
螺旋強度
電光特性
dielectric anisotropy
amorphous blue phase
helical twisting power
electro-optical characteristics
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摘要: 本論文選擇介電異方性(Dielectric Anisotropy) 小於零之液晶材料,並添加適當螺旋強度(HTP) 之旋光性分子,產生溫寬約8.5 度且範圍涵蓋室溫之霧狀藍相(BPIII)。 從實驗結果中可觀察到,當施加一水平電場於BPIII,經電場誘發之複折射率隨電場強度增強而增加並且無遲滯現象。BPIII 在光學均向暗態與光學非均向亮態間的切換速度約6 毫秒。 本論文亦使用介電異方性大於零之液晶材料,並添加旋光性分子產生一螺距近似之藍相液晶。而比較兩樣品發現,當螺距近似時,藍相存在之溫度範圍並不相似。兩樣品之電光特性行為相似,但由於經電場誘發之慢軸方向互相垂直,造成旋光方向相反。
In this thesis, we used a liquid crystal with negative dielectric anisotropy and added chiral dopant with moderate helical twisting power (HTP) to produce BP. The temperature range of amorphous blue phase (BPIII) is about 8.5 ◦C and it covers room temperature. From the experimental results, we observe that, as a horizontal electric field is applied on BPIII, the induced birefringence enhanced as the electric field increasing and hysterisis effect,is free. The response time of BPIII is short in dark state and bright state switching. We also used a liquid crystal with positive dielectric anisotropy and added chiral dopant to produce BP in similar pitch. Comparison with two samples, even if the pitch is similar, the temperature ranges of BP are not similar. The electro-optical characteristics of two samples are similar, but the optical rotations of light areoppositely because the induced slow axes are vertically.
URI: http://hdl.handle.net/11455/96481
文章公開時間: 2020-08-24
顯示於類別:奈米科學研究所

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