液晶波導之研究

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姓名

蔡季芳(Ji-fang Tsai) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

液晶波導之研究
(Study of Liquid Crystal Waveguide)

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摘要(中)

本論文所研究的液晶波導，主要是將液晶注入以二氧化矽為包覆層之中空波導核心，藉由液晶的介電特性，期望此液晶波導變成電調變的光學元件。
由於液晶波導的包覆層為二氧化矽，其光運用全反射原理傳播，操作波段為1550 nm。首先利用單層介面反射與穿透原理與光束傳播法（Beam Propagation Method）來模擬計算，以決定製程上所需要的二氧化矽膜層厚度為4 ?m，而不論波導核心為no、ne或n ̅，光可以在液晶波導中侷限住。
在量測方面，以偏光顯微鏡的觀測並推測在未施加電壓時的液晶導軸排列方向與波導的光傳播方向平行，當達到最大電壓時，其波導中心區域的液晶導軸方向，幾乎平行電場；但波導邊緣的液晶卻與波導的光傳播方向夾45度角。接著量測液晶波導傳播特性，其輸出光強度的趨勢會隨著電壓的增大，先衰減，再逐漸變大，當外加電壓18 Vpp時，液晶波導的最大衰減量為22 dB，可做為光開關。在100 Vpp以上的高外加電壓，其液晶波導輸出光能量與偏振相關，由於液晶導軸方向平行於外加電場，當入射光偏振態感受到液晶折射率為ne，其侷限效果較佳，所以輸出端的光強度較高，其傳遞損耗也較低。

摘要(英)

In this study, we fabricate the liquid crystal waveguides (LCWs) by infiltrating liquid crystal into hollow waveguides whose cladding layer is SiO2 layer. The electrical modulation of the LCWs can be achieved by dielectric properties of liquid crystals.
The light propagates in LCWs by the total internal reflection because the index of cladding layer made by SiO2 is higher than core layer. We design the cladding thickness of LCWs is 4 ?m and operate the wavelength at 1550 nm by the Fresnel equation and by beam propagation method. The simulation results show that the LCWs provides a good confinement no matter the refractive indices of core is no, ne or n ̅.
The light is well confined and polarization-dependent when the external voltage is over 100 Vpp. In low external voltage, the output intensity can be changed by different external voltage. The devices can serve as an electrically tunable liquid crystal switch with over 22 dB attenuation at 18 Vpp.

關鍵字(中)

★ 波導
★ 液晶

關鍵字(英)

★ Liquid Crystal Waveguide
★ Liquid Crystal
★ Waveguide

論文目次

摘要 I
Abstract II
致謝 III
目錄 IV
圖目錄 VI
表目錄 X
第一章序論 1
1.1 光波導 2
1.2 液體核心光波導 3
1.2.1 液體核心波導(I)－利用全反射原理傳播 3
1.2.2 液體核心波導(II)－利用干涉反射原理傳播 5
1.2.3 液晶波導 7
第二章基本原理與液晶波導膜層設計 15
2.1 光波導設計原理 15
2.1.1單層介面反射與穿透原理 15
2.1.2 光束傳播方法（Beam Propagation Method, BPM） 19
2.2 液晶簡介 22
2.2.1 液晶的定義 22
2.2.2 液晶的種類 23
2.2.3 液晶的光學特性 26
2.2.4 液晶的介電特性 29
2.3液晶波導設計與模擬 31
2.4 結論 35
第三章液晶波導製程與量測結果分析 36
3.1 液晶波導製作 36
3.2液晶波導之量測架構 41
3.2.1 以偏光顯微鏡觀測 41
3.2.2 液晶波導量測架構 42
3.3液晶波導量測結果與分析 44
3.3.1 以偏光顯微鏡觀測液晶波導之結果與分析 44
3.3.2 液晶波導量測結果與分析 49
3.4 結論 54
第四章總結與未來工作 55
4.1 本文總結 55
4.2 未來工作 57
4.2.1 液晶波導的改良 57
4.2.2 布拉格反射式液晶波導 58
參考文獻 64

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指導教授

陳啟昌(Chii-Chang Chen)

審核日期

2011-7-27

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