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研究生:顏仕強
研究生(外文):Shih-Chiang Yen
論文名稱:多穩態變焦液晶透鏡之研究
論文名稱(外文):Studies of Multistable Variable-Focus Liquid Crystal Lenses
指導教授:林蕙琪
指導教授(外文):Hui-Chi Lin
學位類別:碩士
校院名稱:國立虎尾科技大學
系所名稱:光電與材料科技研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2013
畢業學年度:101
語文別:中文
論文頁數:74
中文關鍵詞:液晶多穩態液晶透鏡
外文關鍵詞:liquid crystalsmulti-stableliquid crystals lens
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本研究透過雷射雕刻ITO電極的方法,在ITO玻璃基板上雕刻出中空圓孔型電極,製造出空間中非均勻電場,改變液晶分子導軸的指向,使液晶層內呈現出折射率梯度的分佈,造成光線路徑的偏折,製作出液晶透鏡,以達到聚焦的效果。所使用的材料為向列型液晶摻雜聚合物12-氫氧基硬酯酸(12-hydroxystearic acid,以下簡稱HSA),利用HSA其自組織性質,使HSA摻雜液晶樣本在室溫時呈現膠狀。藉由改變外加電壓與環境溫度之操作方式,可在無外加電壓下得到不同的焦距,製作出多穩態液晶透鏡,並進一步製作奈米金加熱薄膜於玻璃基板,因此利用照光及外加電壓,即可調控透鏡的焦距,改善了需加熱器才可變焦的缺點,做出變焦液晶透鏡具有省電的優點,因此具有高應用潛力。

In this study, a multistable tunable-focus lens based on liquid crystal doped self-assembly material (12-hydroxystearic acid; HSA) with hole-patterned electrode method is demonstrated. The mechanism of multi-stable characteristic is that hydrogen-bond forces between HSA molecules make the HSA-doped LC material to form a gel compound in room temperature. Firstly, we control the temperature of sample to 100 oC. Secondly, apply a voltage to the sample in the high temperature, and then to cool the sample to room temperature in an applied external electric field. Finally, turn off the applied voltage. After the experimental process, various focal length of lens can be stabilized, which can be used to save power. The experimental results show that the tunable range of focal length is 1.6 ~ 5 cm when a voltage (V =20 ~ 80 V) is applied in the process. The result is similar to that of a lens based on pure LCs. Besides, a LC lens coated with Au-PVA films on the outer surface of substrates, which are used as heating films, is fabricated. The results indicate that the focal length can be tuned after simutaneous the irradiation of laser light and the application of a voltage. The tunable range is the same to that with the heating method. The optically and electrically controlled LC lens with multistable characteristic has potential for practical application.

中文摘要 ............................................. i
英文摘要 ............................................. ii
致謝 ............................................. iii
目錄 ............................................. iv
圖目錄 .............................................. vii
符號說明 ............................................. xi
第一章 導論........................................... 1
1.1 前言.......................................... 1
第二章 液晶簡介........................................ 2
2.1 液晶介紹....................................... 2
2.2 液晶的分類..................................... 3
2.3 液晶物理....................................... 12
2.3.1 液晶的光學異向性與雙折射性........................ 12
2.3.2 液晶的介電異向性................................ 15
2.3.3 溫度對液晶的影響................................ 17
2.3.4 液晶的連續彈性體理論............................. 18
2.3.5 Freedericksz Transition...................... 20
第三章 論文相關理論..................................... 21
3.1 液晶透鏡的形成.................................. 21
3.2 非均勻電場下液晶分子重新取向....................... 24
3.3 梯度折射率透鏡理論............................... 28
3.4 自組織材料穩固液晶分子之排列....................... 32
3.5 金屬奈米粒子的表面電漿共振........................ 33
第四章 實驗裝置與步驟................................... 34
4.1 樣本的製作..................................... 34
4.1.1 材料介紹....................................... 34
4.1.2 樣本製作....................................... 37
4.2 實驗步驟與裝置.................................. 39
4.2.1 達多穩態之實驗步驟............................... 39
4.2.2 液晶透鏡焦距測量之實驗裝置........................ 41
第五章 實驗結果與討論................................... 42
5.1 液晶透鏡之實驗結果與討論.......................... 42
5.1.1 不同樣本厚度.................................... 42
5.1.2 不同rubbing深度................................ 44
5.1.3 不同HSA濃度.................................... 46
5.1.4 不同降溫速率.................................... 47
5.1.5 不同ITO圓孔直徑之LC透鏡.......................... 49
5.1.6 不同電壓下LC透鏡的調控........................... 51
5.1.7 多穩態透鏡與純LC透鏡之比較........................ 54
5.1.8 液晶透鏡的室溫調控............................... 55
5.1.9 液晶透鏡穩固時間................................. 57
5.2 光熱及電壓可調控之液晶透鏡........................ 58
5.2.1 奈米金加熱膜之特性............................... 58
5.2.2 不同照光時間.................................... 59
5.2.3 不同冷卻時間之測試............................... 60
5.2.4 具奈米金加熱膜之液晶透鏡焦距測量................... 61
第六章 結論與未來展望................................... 63
6.1 結論.......................................... 63
6.2 未來展望....................................... 64
參考文獻 ............................................. 65

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