臺灣博碩士論文加值系統

中文摘要

本論文，研究分成三個部份，第一部份是研究光孤子在向列型液晶中形成的機制，向列型液晶在外加電場的輔助下，液晶分子容易受光場影響而轉動，導致有效折射率的改變，光束在液晶中產生自聚焦效應平衡繞射效應，形成空間光孤子。第二部份研究光孤子的交互作用，光孤子會建立一個折射係數的勢井，另一道光孤子會受到勢井的影響被吸引，調整兩道光孤子之間至適當的距離及角度，將會成螺旋狀的形式向前傳播。第三部份是以探測光束偵測光孤子通道，光孤子的路徑像波導，我們將探測光束以不同的角度打進光孤子通道，在適當角度範圍內探測光束會隨著光孤子的路徑前進並形成光孤子。

Abstract



There are three parts in this paper. The first, we study the mechanism of soliton in nematic liquid crystal (NLC), molecules of NLC will be rotated easily by optical field while we apply an external electric field. Then the effective refraction index is changed. The light beam in NLC will create spatial soliton by producing the effect of self-focusing to balance the diffraction. Second, we study the interaction between solitons. One soliton will create a potential well of refraction index. The other one will be attracted in the potential well. These two solitons propagate in the form of spiral, if the separated distance and the angle are suitable. And the third, we observe the phenomenon with probe beam in the path of soliton. The path of the soliton forms a channel like a wave guide. The probe beam insert into the path of the soliton with different angles. The probe beam collides with the soliton in the proper range of angles will follow its path.

目錄
第一章 導論
§1-1 前言
§1-2液晶簡介
§1-2-1 何謂液晶
§1-3-2 液晶的種類
§1-3 光孤子簡介
§1-3-1孤粒子
§1-3-2空間光孤子
第二章 理論
§2-1 液晶的一些物理性質
§2-1-1分子排列的秩序參數
§2-1-2液晶的彈性連續體理論
§2-2 液晶的光電特性
§2-3雷射光場引誘向列型液晶分子重新取向

第三章 實驗裝置與步驟
§3-1 樣品的製作
§3-1-1材料介紹
§3-1-2樣品的製作
§3-1-3檢驗液晶樣品的水平配向
§3-2 實驗裝置與步驟
§3-2-1 光孤子實驗裝置與步驟
§3-2-2兩道光孤子相互作用實驗裝置與步驟
§3-2-2打進探測光束的實驗裝置與步驟

第四章 實驗結果與討論
§4-1光孤子實驗
§4-1-1 實驗結果
§4-1-2 實驗討論
§4-2光孤子交互作用實驗
§4-2-1 實驗結果
§4-2-2 實驗討論
§4-3探測光束實驗
§4-3-1 實驗結果
§4-3-2 實驗討論

第五章 結論與展望
§5-1 結論
§5-2 展望
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