English  |  正體中文  |  简体中文  |  Items with full text/Total items : 68069/68069 (100%)
Visitors : 23031592      Online Users : 206
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version

    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/80612

    Title: 非對稱式液晶光電元件及其應用;Asymmetrical liquid crystal opto-electronic devices and their applications
    Authors: 涂清彥;Tu, Ching-Yen
    Contributors: 光電科學與工程學系
    Keywords: 液晶;光柵;非對稱;liquid crystal;grating;asymmetric
    Date: 2019-08-20
    Issue Date: 2019-09-03 14:48:21 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本論文分別利用膽固醇液晶搭配四分之一波板與線偏振片、扭轉向列型液晶摻雜二色性染料以及扭轉向列型液晶摻雜二色性染料之光柵探討非對稱光學特性。
    ;In this thesis, we report the asymmetrical optical properties of the three liquid crystal (LC) devices, including (i) cholesteric LC coupled with a quarter-wave plate and a linear polarizer, (ii) dichroic dye-doped 90° twisted nematic LC (DDd-90° TNLC), and (iii) dye-doped TNLC gratings.
    In the first part, the incident light passes through the linear polarizer and the quarter-wave plate to form a circularly polarized light which can be reflected by the planar textures of the cholesteric LC (CLC) plate, so the asymmetrical optical property can be achieved. Moreover, the reflection bandwidth and wavelength of the CLC plate is dependent on the angle of propagation direction of the incident light, so the 1D-DIMOS software was also adopted to simulate the limitation of visual angle of this LC device.
    In the second part, owing to the rubbing direction of the two glass substrates are perpendicular to each other and the dichroic dyes possess the polarization selective light absorption, the DDd-90° TNLC device has the asymmetrical light absorption property. By measuring the polarization rotation and the polarization selective light absorption, the asymmetrical optical properties of the DDd-90° TNLC are completely demonstrated and analyzed, and the experimental results do agree well with the theoretical analyses. Furthermore, in the final part, we extend such an interesting structure to the dye-doped TNLC grating fabricated through the photoalignment process. According to the experimental results and the theoretical simulation about the polarization rotation properties of the dye-doped TNLC gratings, we demonstrate that the same linearly polarized light (0˚ or 90˚) incident onto the illuminated and the unilluminated surfaces presents the asymmetric diffraction property. Moreover, the diffraction efficiency based on the dichroic dye absorption and phase difference between the two kinds of LC structures of the dye-doped TNLC grating can be tuned electrically.
    Appears in Collections:[光電科學研究所] 博碩士論文

    Files in This Item:

    File Description SizeFormat

    All items in NCUIR are protected by copyright, with all rights reserved.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback  - 隱私權政策聲明