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系統識別號 U0026-1508201823521400
論文名稱(中文) 全息曝光製程於聚合物網絡液晶盒摻雜不同濃度的手性分子製作偏振無關相位調制器之研究
論文名稱(英文) Study of polarization-independent phase modulators fabricated by holographic photo exposure in polymer network liquid crystal cells with various concentration of chiral dopant
校院名稱 成功大學
系所名稱(中) 光電科學與工程學系
系所名稱(英) Department of Photonics
學年度 106
學期 2
出版年 107
研究生(中文) 林俊圜
研究生(英文) Chun-Yuan Lin
學號 L76051265
學位類別 碩士
語文別 中文
論文頁數 66頁
口試委員 口試委員-鄭協昌
口試委員-黃啟炎
指導教授-許家榮
中文關鍵字 偏振無關相位調制器  全息曝光  聚合物網絡液晶  手性分子 
英文關鍵字 polarization-independent phase modulator  chiral dopant  polymer network liquid crystal  holographic exposure 
學科別分類
中文摘要 本論文主要的研究內容是利用全息曝光製程於聚合物網絡液晶盒摻雜不同濃度的手性分子製作偏振無關相位調制器。在曝光製程時,液晶樣品處於高溫條件以使液晶盒內之混合物達到各向同性的狀態。
本實驗中採用的光聚合物為RM257,並摻雜不同濃度手性分子S811。相位調制器製作之曝光條件為樣品控溫於100 ℃條件下使用紅光氦氖雷射光強度2 mW/cm2進行曝光3分鐘,所製作之最佳液晶相位調制器具有於可見光波段內85 %以上的穿透率、660~710 μs的快速反應時間、外加120 Vrms下約1.1 π的偏振無關相位調制能力等特性。
本實驗亦發現當元件在較高電壓操作後,其無電壓驅動時的液晶分子排列與初始條件時的情形不一致,造成電壓調制相位的困難。為了克服此問題,實驗嘗試利用熱退火處理電壓操作後之相位調制器使其回復電壓操作前的初始狀態,並比對熱退火前後之元件特性是否一致,結果發現確實可以透過熱退火步驟使其還原初始狀態且維持住元件原本特性。
英文摘要 Using holographic photo exposure to process polymer network liquid crystal cells with various concentration of chiral dopant in the high temperature isotropic phase, it is available that liquid crystal micro-domains with random director orientations can be achieved in cells at room temperature. Three various concentrations of 10, 15, and 20 wt% chiral dopant were investigated for the fabrications of liquid crystal phase modulators in this study. The final optimal performance of fabricated phase modulator show capabilities including low light scattering, high transmittance over 80 % achieved in the visible wavelength spectrum, sub-millisecond optical response, polarization-independence, and 1.1π phase modulation range. However, an occurred issue must be solved that the electrically driven phase modulators cannot return to their initial cell statuses without applied voltage so that inconsistent phase modulations occurred. A proposed way of thermal annealing was used to overcome this issue and confirm the consistence of phase modulations in the fabricated devices.
論文目次 摘要 I
Abstract II
誌謝 XI
目錄 XIII
圖目錄 XV
表目錄 XVIII
第一章 緒論 1
1-1 前言 1
1-2 研究動機 3
第二章 實驗原理 5
2-1 向列型液晶(Nematics)特性介紹 5
2-2 Freedericksz Transition[13] 6
2-3 聚合物濃度高低形成兩種液晶元件[14] 7
2-4 聚合物相分離 8
第三章 實驗材料與架構 10
3-1 實驗材料 10
3-2 實驗儀器[14] 13
3-3 樣品製作 16
3-4 樣品量測 19
3-4-1 穿透頻譜 19
3-4-2 相位變化與偏振無關特性 20
3-4-3 反應時間 24
第四章 實驗結果與討論 26
4-1 5 μm樣品結果 26
4-1-1 元件外觀圖與於正交偏振片下觀察圖 26
4-1-2 電壓對穿透率(Voltage-Transmittance)曲線量測 28
4-1-3 穿透頻譜量測 30
4-1-4 偏振不相關相位量測 31
4-1-5 反應時間量測 44
4-2 12 μm樣品結果 46
4-2-1 樣品熱退火(annealing) 46
4-2-2 偏振不相關相位量測 48
4-2-3 反應時間量測 56
4-2-4 穿透頻譜量測 58
4-2-5 無偏振片量測相位 59
第五章 結論與未來展望 62
5-1 結論 62
5-2 未來展望 63
參考文獻 65

參考文獻 [1] Huang, Yuhua, Chien-Hui Wen, and Shin-Tson Wu. "Polarization-independent and submillisecond response phase modulators using a 90 twisted dual-frequency liquid crystal." Applied physics letters, 89, 2(2006)
[2] Lin, Yi-Hsin, and Yu-Shih Tsou. "A polarization independent liquid crystal phase modulation adopting surface pinning effect of polymer dispersed liquid crystals." Journal of Applied Physics,110, 11 (2011)
[3] Sun, Jie, et al. "Submillisecond-Response Polymer Network Liquid Crystal for Next-Generation Spatial Light Modulators." Digest of Technical Papers - SID International Symposium, 45, 1, (2014)
[4] Ren, Hongwen, Yi-Hsin Lin, and Shin-Tson Wu. "Polarization-independent and fast-response phase modulators using double-layered liquid crystal gels." Applied physics letters, 88, 6 (2006)
[5] Lin, Yi-Hsin, et al. "A polarization-independent liquid crystal phase modulation using polymer-network liquid crystals in a 90 twisted cell." Journal of Applied Physics, 112, 2 (2012)
[6] Chien, Chun-Yu, et al. "Holographic polymer networks formed in liquid crystal phase modulators via a He-Ne laser to achieve ultra-fast optical response." Optics express, 24, 7 (2016)
[7] Sun, Jie, and Shin‐Tson Wu. "Recent advances in polymer network liquid crystal spatial light modulators." Journal of Polymer Science Part B: Polymer Physics, 52, 3 (2014)
[8] Natarajan, Lalgudi V., et al. "Switchable holographic polymer-dispersed liquid crystal reflection gratings based on thiol− ene photopolymerization." Chemistry of materials, 15, 12 (2003)
[9] Caputo, Roberto, et al. "Development of a new kind of switchable holographic grating made of liquid-crystal films separated by slices of polymeric material." Optics letters, 29, 11 (2004)
[10] Ren, Hongwen, and Shin-Tson Wu. "Inhomogeneous nanoscale polymer-dispersed liquid crystals with gradient refractive index." Applied Physics Letters, 81, 19 (2002)
[11] Sun, Jie, Yuan Chen, and Shin-Tson Wu. "Submillisecond-response and scattering-free infrared liquid crystal phase modulators." Optics express, 20, 18 (2012)
[12] Yang, Young-Cheol, and Deng-Ke Yang. "Electro-optic Kerr effect in polymer-stabilized isotropic liquid crystals." Applied Physics Letters, 98,2 (2011)
[13] Deng-Ke Yang, Shin-Tson Wu “ Fundamentals of Liquid Crystal Devices,” Chap. 5, John Wiley & Sons (2006)
[14]簡均祐,”以氦氖雷射全像曝光製作可調液晶相位光柵之研究,”國立成功大學光電工程學系碩士論文(2014)
[15] Deng-Ke Yang, Shin-Tson Wu, “Fundamentals of Liquid Crystal Devices,” Chap. 11 , John Wiley & Sons (2006)
[16] Lam-Choon Khoo, “Liquid Crystals,” 2nd. Edition, Chap. 1, John Wiley & Sons (2007)
[17] Chien, Chun-Yu, Pin-Kuan Sung, and Chia-Rong Sheu. "Photo-Polymerization in Chiral Dopant Liquid Crystal Cells via Holographic Exposure to Fabricate Polarization-Independent Phase Modulator with Fast Optical Response." Polymers, 10, 3 (2018)
[18] 張仕仁,“用雙丙烯酸酯薄膜記錄氦氖雷射全像干涉光場光訊息之研究,”國立中山大學光電工程學系碩士論文(2011)
[19] Spectra group Limited Inc., “Photoinitiators, enabling technology in photochemistry photochemical products and services contract research and development”
[20] Lucchetta, D. Ee, et al. "Phase-only modulation by nanosized polymer-dispersed liquid crystals." Journal of applied physics, 91, 9 (2002)
[21]黃麟淞,”無偏振依賴與快速反應之藍相液晶微透鏡陣列,”國立中山大學物理學系碩士論文(2013)
[22] Lin, Yi-Hsin, et al. "Measuring electric-field-induced birefringence in polymer stabilized blue-phase liquid crystals based on phase shift measurements." Journal of Applied Physics, 109,10 (2011)
[23] Lee, Yun-Han, et al. "Hysteresis-free and submillisecond-response polymer network liquid crystal." Optics Express, 24, 13 (2016)
[24] Lorenz, Alexander, Larissa Braun, and Valeria Kolosova. "Continuous optical phase modulation in a copolymer network nematic liquid crystal." ACS Photonics, 3, 7 (2016)
[25] Yu, Ji Hoon, et al. "Electrically tunable microlens arrays based on polarization-independent optical phase of nano liquid crystal droplets dispersed in polymer matrix." Optics express, 23,13 (2015)
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