| 研究生: |
張維宏 Chang, Wei-Hong |
|---|---|
| 論文名稱: |
染料摻雜液晶薄膜之雷射引致繞射光柵之研究 Laser-induced diffractive gratings in dye-doped liquid-crystal films |
| 指導教授: |
李佳榮
Lee, C.-R. |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 光電科學與工程研究所 Institute of Electro-Optical Science and Engineering |
| 論文出版年: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 75 |
| 中文關鍵詞: | 染料摻雜 、光柵 |
| 外文關鍵詞: | TN grating, dye-doped |
| 相關次數: | 點閱:113 下載:1 |
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本論文主要探討染料摻雜液晶薄膜受雷射光激發所產生的繞射光柵
現象。由於雷射光激發染料同素異構化反應的細緻細附與波紋結構會使
得液晶造成不同的配向效果,兩者分別形成了40° 與 -50° TN 結構。周
期性的TN 結構形成繞射光柵,利用此一方法形成的繞射光柵具有高繞射
效率(~25%)且具有適度性的繞射與偏振非相關性,此外還可以利用電壓
去調控繞射效率,經過長時間的驗証此繞射元件亦具有高度記憶性。
The laser-induced diffractive gratings are investigated in azo dye-doped liquid crystal(DDLC) films. The formation of the gratings are owing to the laser-induced fine and homogeneous dye adsorption and laser-induced ripple structure. Which causes, respectively, the 40° and -50° twisted nematic(TN) structures. The gratings have great diffractive properties, such as high diffraction efficiency (~25%), high polarization independence (~90%), and electrical switch-ability.
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