| 研究生: |
林良真 Lin, Liang-chen |
|---|---|
| 論文名稱: |
使用雙面光配向技術製作高效率與偏振無關的染料摻雜液晶Fresnel光學透鏡 Highly efficient and polarization-independent Fresnel lens based on dye-doped liquid crystal using double-side photo-alignment technique |
| 指導教授: |
傅永貴
Fuh, Ying-guey |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 物理學系 Department of Physics |
| 論文出版年: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 97 |
| 中文關鍵詞: | 夫瑞奈區板 、聚焦效率 、雙面光配向 |
| 外文關鍵詞: | Fresnel Zone Plate, Fresnel lens, Diffraction Efficiency, Double-side Photoalignment Technique |
| 相關次數: | 點閱:87 下載:3 |
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本篇論文主題是利用雙面光配向技術製作具有高聚焦效率、聚焦效率與入射偏振狀態無關,同時可藉由電壓調制聚焦效率的染料摻雜液晶的Fresnel lens光學元件(DDLC Fresnel lens);而且該元件在第一聚焦處的聚焦效果有如一片1/2波板,此現象並不隨外加電壓改變而消失或變更。
傳統夫瑞奈區板(Fresnel Zone Plate)為了達到聚焦的效果,必須犧牲部份聚焦效率而將偶數(或奇數)圈的同心圓環設計成不透光區域;但是在本篇論文所發表的DDLC Fresnel lens元件,因使用液晶取代傳統製程必需遮蔽掉的區域,所以聚焦效率會較夫瑞奈區板高,並利用雙面光配向技術將奇數同心圓環區的液晶長軸光配向成和偶數同心圓環區的液晶長軸互相垂直;當奇偶圓環區相位差(Relative Phase Shift)等於π時,此元件在第一聚焦處會產生最大聚焦效率,其值約為~37%,遠高於原夫瑞奈區板光罩聚焦效率~25.6%,且趨近於理論最大值~40.5%;另外,該元件的製程簡易,且擁有反應時間迅速的特性,這些優良特性使得此元件之應用潛力甚高。
We demonstrated a highly efficient, polarization-independent and electrically tunable Fresnel lens based on dye-doped liquid crystal (DDLC) using double-side photoalignment technique. In addition, such a lens functions as a half-wave plate, and this feature could be well preserved under an applied voltage.
The conventional Fresnel zone plate sacrifices the diffraction efficiency to get focus property at the focusing points by blocking the even (or odd) zones. In this presented DDLC Fresnel lens, the blocked even (odd) zones were replaced by LCs with the LCs director of those zones being orthogonal to the LCs director of odd (even) zones.
At the relative phase shift of π between the odd and even zones, the primary diffraction efficiency has the maximum value. The maximum diffraction efficiency reaches ~37%, which approaches the theoretical limit ~40.5%. For reference, the diffraction efficiency of the used Fresnel zone plate mask is ~25.6%. In addition, the device is simple to fabricate, and has fast switching responses between focusing and defocusing state. These features make the device to have a high potential for practical application.
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