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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 蔡永傑(Wing-Kit Choi) | |
dc.contributor.author | Yan-Min Li | en |
dc.contributor.author | 李彥民 | zh_TW |
dc.date.accessioned | 2021-06-16T04:03:58Z | - |
dc.date.available | 2015-02-03 | |
dc.date.copyright | 2015-02-03 | |
dc.date.issued | 2014 | |
dc.date.submitted | 2014-10-02 | |
dc.identifier.citation | [1] I. Dierking, 'Polymer network-stabilized liquid crystals,' Advanced Materials, vol. 12, pp. 167-+, Feb 3 2000.
[2] D. K. Yang, L. C. Chien, and J. W. Doane, 'Cholesteric Liquid-Crystal Polymer Dispersion for Haze-Free Light Shutters,' Applied Physics Letters, vol. 60, pp. 3102-3104, Jun 22 1992. [3] X. Y. Nie, R. B. Lu, H. Q. Xianyu, T. X. Wu, and S. T. Wu, 'Anchoring energy and cell gap effects on liquid crystal response time,' Journal of Applied Physics, vol. 101, May 15 2007. [4] S. E. Hicks, S. P. Hurley, R. S. Zola, and D. K. Yang, 'Polymer Stabilized VA Mode Liquid Crystal Display,' Journal of Display Technology, vol. 7, pp. 619-623, Nov 2011. [5] D. H. Lee, K. D. Vuong, J. A. A. Williams, J. Fagan, R. A. Condrate, and X. W. Wang, 'RF aerosol plasma fabrication of indium tin oxide and tin oxide thin films,' Journal of Materials Research, vol. 11, pp. 895-903, Apr 1996. [6] Y. H. Lin, J. M. Yang, Y. R. Lin, S. C. Jeng, and C. C. Liao, 'A polarizer-free flexible and reflective electrooptical switch using dye-doped liquid crystal gels,' Optics Express, vol. 16, pp. 1777-1785, Feb 4 2008. [7] V. V. Presnyakov and T. V. Galstian, 'Electrically tunable polymer stabilized liquid-crystal lens,' Journal of Applied Physics, vol. 97, May 15 2005. [8] Y. H. Fan, Y. H. Lin, H. W. Ren, S. Gauza, and S. T. Wu, 'Fast-response and scattering-free polymer network liquid crystals for infrared light modulators,' Applied Physics Letters, vol. 84, pp. 1233-1235, Feb 23 2004. [9] H. Nakamura, 'A model of image display in the optimized overdrive method for motion picture quality improvements in liquid crystal devices,' Japanese Journal of Applied Physics Part 1-Regular Papers Short Notes & Review Papers, vol. 40, pp. 6435-6440, Nov 2001. [10] H. W. Ren and S. T. Wu, 'Anisotropic liquid crystal gels for switchable polarizers and displays,' Applied Physics Letters, vol. 81, pp. 1432-1434, Aug 19 2002. [11] C. Y. Huang, R. X. Fung, and Y. G. Lin, 'Effects of curing conditions on electrooptical properties of polymer-stabilized liquid crystal pi cells,' Japanese Journal of Applied Physics Part 1-Regular Papers Brief Communications & Review Papers, vol. 46, pp. 5230-5232, Aug 2007. [12] P. D. Atherton, N. K. Reay, J. Ring, and T. R. Hicks, 'Tunable Fabry-Perot Filters,' Optical Engineering, vol. 20, pp. 806-814, 1981. [13] J. S. Patel and M. W. Maeda, 'Tunable Polarization Diversity Liquid-Crystal Wavelength Filter,' Ieee Photonics Technology Letters, vol. 3, pp. 739-740, Aug 1991. [14] K. Hirabayashi, H. Tsuda, and T. Kurokawa, 'Tunable Liquid-Crystal Fabry-Perot-Interferometer Filter for Wavelength-Division Multiplexing Communication-Systems,' Journal of Lightwave Technology, vol. 11, pp. 2033-2043, Dec 1993. [15] R. Szipocs, A. Kohazi-Kis, S. Lako, P. Apai, A. P. Kovacs, G. DeBell, et al., 'Negative dispersion mirrors for dispersion control in femtosecond lasers: chirped dielectric mirrors and multi-cavity Gires-Tournois interferometers,' Applied Physics B-Lasers and Optics, vol. 70, pp. S51-S57, Jun 2000. [16] J. Sun and S. T. Wu, 'Recent Advances in Polymer Network Liquid Crystal Spatial Light Modulators,' Journal of Polymer Science Part B-Polymer Physics, vol. 52, pp. 183-192, Feb 1 2014. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/55465 | - |
dc.description.abstract | 液晶科技的應用已經廣泛地運用在我們生活周遭,並不再局限於顯示器中,還有許多方面可以被應用,例如我們會討論的法布立-培若干涉儀(Fabry-Perot interferometer)可以做成可調變波長濾波器(WDM)內部的元件。對於一般液晶分子的特性,在轉換不同電壓之間液晶分子會改變不同排列方式,所需要花費的時間稱之為響應時間(Response Time),這對顯示器來說是很重要的參數,響應的時間必須小於人類肉眼視覺停留時間,眼睛才會感覺顯示器的畫面是呈現連續的狀態。最近有許多高分子穩定型液晶(Polymer Stabilized Liquid Crystal, PSLC) 的研究不斷的被發表,它是經由液晶與單體以特定比例下組合而成的混和物,當PSLC經過紫外光固化後單體會變成聚合物,使液晶分子在降電壓過程中加速回復到原本沒有加電壓的排列狀態,故放電壓響應時間toff會縮短,另外加電壓響應時間ton可經由過驅電壓(overdrive voltage)去改善。
高分子穩定型液晶常見的現象是加上超過臨界點的電壓時,因為聚合物的結構無法使液晶有規律地旋轉倒向,使液晶分子會隨機地倒向造成明顯的散射現象,加上如上述說明高分子穩定型液晶具有快速的響應時間,PSLC可以被做成光學儀器中的快速門閘(shutter)和電控調光玻璃(privacy glass)。我們的研究方向是利用它快速響應時間的優點在法布立-培若(Fabry-Perot)干涉儀中以達到快速可調變波長濾波器,並加上固化電壓可以改變垂直排列高分子穩定型液晶的散射特性,讓它在加上電壓後仍然保持高穿透率去調製波長,這種濾波器在通訊系統中有著快速調變波長的功能,是被看好的。 | zh_TW |
dc.description.abstract | Liquid crystal technologies have been used in our daily life. It has not only been utilized in displays but also in other applications such as Fabry-Perot interferometers in wavelength division multiplexing (WDM). Liquid crystal has a characteristic that it would change its molecular orientation when a voltage is applied. The time it takes to rotate is called response time. For display and many other applications, this is a very important parameter. For example, the display images would appear as a continuous motion for human visual system if response time is smaller than time interval that can be distinguished by human eyes. Due to its fast response time, it can also be used as rapid shutters for optical instruments or used as privacy glass.
Polymer Stabilized Liquid Crystal (PSLC) is one kind of liquid crystal (LC) gel that has been reported. It is composed of liquid crystal and monomer under certain ratio. After UV curing, monomers would become polymers which can help LC molecules restore back to original state more quickly when a lower voltage is applied. Hence, the LC decay time can be shortened. On the other hand, the rise time can be improved by applying an overdrive voltage. PSLC usually has a common phenomenon which is that, after an applied voltage, the LC molecules would tilt randomly which causes strong scattering. This is due to the structure of the formed polymer which does not allow LC molecules to tilt consistently. In this thesis, a curing voltage was found to be able to help reduce the strong scattering effect of the VA-PSLC (Vertical Alignment PSLC) significantly. It therefore can have a high on-state transmittance. We take the advantage of fast response time of PSLC and place it inside a Fabry-Perot cavity to achieve a wavelength tunable filter. These filters can have potential applications in wavelength tuning applications (e.g. WDM) in telecommunication systems where high speed is desirable. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T04:03:58Z (GMT). No. of bitstreams: 1 ntu-103-R01941081-1.pdf: 3583486 bytes, checksum: c7ec8b14c70f93314dff169eee5b973b (MD5) Previous issue date: 2014 | en |
dc.description.tableofcontents | 致謝 i
中文摘要 ii Abstract iii 圖索引 vi 表索引 ix 第一章:簡介 1 1.1 介紹液晶 2 1.1.1 液晶的分類 2 1.1.2 液晶的模態 4 1.1.3 液晶的物理特性 5 1.2 介紹高分子穩定液晶(Polymer Stabilized Liquid Crystal) 9 第二章 : 實驗架構 13 2.1 製作與準備過程 13 2.1.1 製作液晶盒 13 2.1.2 製作高分子穩定型液晶 17 2.1.3 製作流程 18 2.2 實驗架構 20 2.2.1 觀察相位差改變之穿透率與電壓的測量 20 2.2.2 穿透率與電壓的測量 22 2.2.3 響應時間的測量 24 第三章 : 高分子穩定型液晶的實驗結果 26 3.1 液晶與聚合物濃度重量百分比的比較 26 3.2 高分子穩定型液晶之厚度的研究 36 3.3 討論固化電壓影響高分子穩定型液晶 39 第四章:用高分子穩定型液晶做可調變波長濾波器 47 4.1 介紹法布立-培若干涉儀 47 4.2 介質反射面的設計與原理 54 4.3 可調變波長濾波器實驗結果 57 第五章:結論與未來目標 65 參考文獻 67 | |
dc.language.iso | zh-TW | |
dc.title | 利用固化電壓減少垂直排列高分子穩定型液晶之散射效應 | zh_TW |
dc.title | Reduction of the Scattering Effect of Vertically Aligned Polymer Stabilized Liquid Crystal by Curing Voltage | en |
dc.type | Thesis | |
dc.date.schoolyear | 103-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 林晃巖(Hoang-Yan Lin),蘇國棟(Guo-Dung Su) | |
dc.subject.keyword | 法布立-培若干涉儀,高分子穩定型液晶,液晶,可調變波長濾波器,固化電壓, | zh_TW |
dc.subject.keyword | polymer stabilized liquid crystal (PSLC),Liquid Crystal,curing voltage,Fabry-Perot filter,wavelength tuning, | en |
dc.relation.page | 68 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2014-10-03 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 光電工程學研究所 | zh_TW |
顯示於系所單位: | 光電工程學研究所 |
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