臺灣博碩士論文加值系統

本實驗利用膽固醇液晶的旋光性，製作可利用偏振選擇濾波功能的Fresnel透鏡。Fresnel透鏡與傳統折射式透鏡一樣，存在本質的色像差現象。本實驗使用反射波段位於紅外光區的膽固醇液晶做成Fresnel透鏡，當線偏振白光通過Fresnel透鏡時，不同波長線偏振光的偏振將旋轉不同的角度，與Fresnel透鏡後的檢偏片之穿透軸互相垂直的線偏振光無法通過檢偏片，在焦點處得到較窄波段的聚焦影像。旋轉偏振片的角度可濾除不同波長的光，得到不同顏色的聚焦影像。

This study demonstrates a polarization selective Fresnel lens based on polymer-stabilized cholesteric liquid crystals (PSCLCs). The polarization selectivity is attributed to the optical activity of the cholesteric liquid crystals, the Bragg reflection band of which is located in the infrared region. Similar to a conventional refractive lens, a severe intrinsic chromatic aberration occurs under broadband illumination, resulting from the wavelength dependence of the focal length. Since the optical activity of the cholesteric liquid crystal is wavelength dependent, the polarization of the constituent wavelengths was rotated by various angles. Under linearly polarized white-light illumination, the PSCLC Fresnel lens focused various colors at the corresponding focal point by adjusting the orientation of the transmission axis of the analyzer to eliminate the specific wavelengths. This device can be regarded as the combination of a Fresnel lens and a band filter.

摘要
Abstract
誌謝
目錄
第一章 簡介
1.1 前言
1.2 液晶簡介
1.3 液晶的分類
1.4 液晶物理特性
第二章 理論介紹
2.1 膽固醇液晶之光學特性
2.2 影響膽固醇液晶螺距的外在因素
2.3 膽固醇液晶之一維光子晶體結構
2.4 膽固醇液晶之旋光性
2.5 聚合物穩定膽固醇液晶結構(Polymer-Stabilized Cholesteric Texture，PSCT)
2.6 Fresnel透鏡理論
2.7 Malus定律
2.8 色像差
第三章 實驗準備及架設
3.1 材料介紹
3.2 樣品空盒製作
3.3 樣品填充
3.4 聚合物穩定膽固醇液晶(Polymer-Stabilized Cholesteric Liquid Crystal)
樣品製作流程
3.5 實驗裝置與量測方法
第四章 實驗結果與討論
4.1 測試未曝光樣品的旋光性
4.2 未曝光樣品的穿透度與特性
4.3 已曝光的PSCLC樣品穿透度與特性
第五章 總結
參考文獻

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