探討黑爾弗里希形變對膽固醇液晶之穿透及反射頻譜調制

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姓名

程素慧(Su-Hui Cheng) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

探討黑爾弗里希形變對膽固醇液晶之穿透及反射頻譜調制
(Investigations of transmissive and reflective spectra of cholesteric liquid crystals modulated by Helfrich deformation)

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至系統瀏覽論文 (2027-6-30以後開放)

摘要(中)

本論文研究主要探討黑爾弗里希形變(Helfrich deformation)的膽固醇液晶之頻譜特徵及其原因，分為兩部分主題，第一部分為分析在不同物理參數下，對Helfrich deformation的膽固醇液晶之影響，藉由量測外加電壓下的穿透頻譜及觀察偏光顯微鏡下的結構，確立各條件下Helfrich deformation出現之電壓值，並比較各條件之反射波段變化，討論其差異及原因。在此部分研究透過改變液晶盒厚度、配向膜種類及濃度配比參數，發現摻雜液晶二聚體的膽固醇液晶，可降低Helfrich deformation出現之電壓值，且各條件之穿透頻譜皆具有頻譜拓寬效果，並且水平配向可增強此效果。本論文第二部分主題為分析Helfrich deformation的膽固醇液晶之頻譜特徵，此頻譜特徵與以往膽固醇液晶不同，其反射波段於穿透頻譜及反射頻譜不同，本論文對此現象的推論為此結構中產生類似波導作用，透過貝里曼4 × 4矩陣模擬以佐證，並將膽固醇液晶結構分為三層結構進行討論，分別為中間層的Helfrich deformation結構與接近基板的兩層邊界層一般膽固醇液晶平面態結構，從模擬頻譜圖了解各層結構間發生的穿透及反射，而在邊界層與中間層間反射光因Helfrich deformation的結構特性，發生來回反射的現象，使Helfrich deformation的膽固醇液晶之反射波段，在反射頻譜與穿透頻譜不同。

摘要(英)

In this thesis, we mainly investigate the spectral characteristics and their root causes of cholesteric liquid crystals (CLCs) with Helfrich deformation. The research topic includes the following two parts. In the first part, we analyze the influences of different physical parameters on the CLCs with Helfrich deformation. According to the measured transmissive spectra of the CLCs applied with electric fields and the observed images under a polarized optical microscopy, the threshold voltage of the Helfrich deformation in each condition can be confirmed. In addition, we also elucidate the differences between them and the corresponding reasons according to the changes of the reflection bands. Furthermore, by varying the cell gap, alignment film, and concentration of the adopted materials, it is found that the CLCs doped with liquid crystal dimer have a lower threshold voltage of the Helfrich deformation, and the transmission spectrum of each condition possesses the feature of broadening the reflection band width. Besides, the homogenous alignment layer can enhance this effect. In the second part, we analyze the spectral characteristics of CLCs with Helfrich deformation, which differ from those of the previous CLCs. The obtained wavelength bands of the transmission spectra and the reflection spectra are different. The cause of this phenomenon can be verified by the Berreman 4 × 4 matrix simulation, and be concluded to be similar to waveguide effect due to such structures. The CLC structures are divided into three layers for simple discussion, namely the middle layer with the Helfrich deformation structure and the boundary layers closed to the substrates with general planar textures of CLCs. The transmission and reflection between the layers of the structures can be clarified from the simulated spectra. Due to the structural characteristics of the Helfrich deformation, the reflected light is reflected back and forth between the boundary layers and the middle layer, so the wavelength bands of the measured reflection and transmission spectra of CLCs with Helfrich deformation are different.

關鍵字(中)

★ 黑爾弗里希形變
★ 貝里曼矩陣
★ 帶寬變化

關鍵字(英)

★ Helfrich deformation
★ Berreman 4 × 4 matrix
★ bandwidth variation

論文目次

摘要 i
Abstract ii
誌謝 iii
目錄 iv
圖目錄 vi
表目錄 xi
符號說明 xii
第一章緒論 1
§1-1 前言 1
§1-2 研究動機 1
§1-3 論文架構 2
第二章液晶簡介 4
§2-1 液晶簡介 4
§2-1-1 液晶歷史[7][8] 4
§2-1-2 液晶定義 4
§2-2 液晶分類 5
§2-2-1 向列型液晶(Nematics)[9] 6
§2-2-2 層列型液晶(Smectics) 7
§2-2-3 膽固醇液晶(Cholesterics) [13][14][15][16] 9
§2-3 液晶光電特性 11
§2-3-1 光學異向性(Optical anisotropy) 11
§2-3-2 介電異向性(Dielectric anisotropy) 15
§2-3-3 液晶連續彈性體理論[19] (Continuum theory) 17
§2-3-4 溫度對向列型液晶的影響 18
§2-3-5 Fréedericksz transition 18
第三章理論介紹 20
§3-1 膽固醇液晶相關理論 20
§3-1-1 膽固醇液晶排列結構 20
§3-1-2 膽固醇液晶結構切換[22][24] 23
§3-1-3 影響膽固醇液晶螺距的外在因素 26
§3-2 Helfrich deformation[27] 28
§3-3 貝里曼矩陣(Berreman 4 × 4 matrix)模擬[30] 29
§3-4 液晶二聚體(Liquid crystal dimer) 34
§3-5 相關文獻回顧 35
第四章實驗方法與製程 39
§4-1 材料介紹 39
§4-1-1 雙頻液晶HEF951800-100 39
§4-1-2 手性分子S811 40
§4-1-3 彎曲型分子CB7CB 40
§4-2 實驗樣品製作 40
§4-2-1 液晶材料配置 40
§4-2-2 ITO基板裁切及清洗 41
§4-2-3 基板表面配向處理(水平配向) 41
§4-2-4 液晶空盒製作 42
§4-2-5 液晶盒厚度量測 42
§4-2-6 注入液晶 44
§4-3 樣品量測 45
§4-3-1 樣品觀測 45
§4-3-2 光譜量測 45
第五章實驗結果與討論 48
§5-1 電控摻雜液晶二聚體之膽固醇液晶 48
§5-1-1 摻雜液晶二聚體對膽固醇液晶穿透頻譜之影響 48
§5-1-2 液晶二聚體濃度對膽固醇液晶的影響 53
§5-1-3 液晶盒厚度對摻雜液晶二聚體之膽固醇液晶的影響 57
§5-1-4 配向膜對摻雜液晶二聚體之膽固醇液晶的影響 59
§5-1-5 手性分子濃度對摻雜液晶二聚體之膽固醇液晶的影響 61
§5-2 以Berreman 4 × 4 matrix分析由Helfrich deformation調制之膽固醇液晶穿透及反射頻譜 63
§5-2-1 量測摻雜液晶二聚體之向列型液晶之尋常光折射率 64
§5-2-2 模擬條件 65
§5-2-3 數據與模擬結果分析 71
第六章結論與未來展望 76
§6-1 結論 76
§6-1-1 電控摻雜液晶二聚體之膽固醇液晶 76
§6-1-2 以Berreman 4 × 4 matrix分析由Helfrich deformation調制之膽固醇液晶穿透及反射頻譜 78
§6-2 未來展望 79
參考資料 81

參考文獻

[1] K. M. Lee, V. P. Tondiglia, M. E. McConney, L. V. Natarajan, T. J. Bunning, and T. J. White, “Color-tunable mirrors based on electrically regulated bandwidth broadening in polymer-stabilized cholesteric liquid crystals,” ACS Photonics 1, 1033-1041 (2014).
[2] H. Coles and S. Morris, “Liquid-crystal lasers,” Nat. Photon. 4, 676-685 (2010).
[3] Y. Li, T. Zhan, Z. Yang, C. Xu, P. L. Likamwa, K. Li, and S. T. Wu, “Broadband cholesteric liquid crystal lens for chromatic aberration correction in catadioptric virtual reality optics,” Opt. Express 29, 6011-6019 (2021).
[4] C. S. Lee, T. A. Kumar, J. H. Kim, J. H. Lee, J. S. Gwag, G. D. Leec and S. H. Lee, “An electrically switchable visible to infra-red dual frequency cholesteric liquid crystal light shutter,” J. Mater. Chem. C 6, 4243-4249 (2018).
[5] R. Ozaki, S. Hashimura, S. Yudate, K. Kadowaki, H. Yoshida, and M. Ozaki, “Optical properties of selective diffraction from Bragg-Berry cholesteric liquid crystal deflectors,” OSA Contin. 2, 3554-3563 (2019).
[6] M. Yu, H. Yang, and D.-K. Yang, “Stabilized electrically induced Helfrich deformation and enhanced color tuning in cholesteric liquid crystals,” Soft Matter 13, 8728-8735 (2017).
[7] F. Reinitzer, “Beiträge zur Kenntniss des Cholesterins,” Monatsh. Chem. 9, 421-441 (1888).
[8] O. Lehmann, “Über fliessende Krystalle”. Zeitschrift für Physikalische Chemie. 4, 462–72 (1889).
[9] I. C. Khoo and S. T. Wu, “Optics and nonlinear optics of liquid crystals,” World Scientific (1993).
[10] 松本正一、角田市良(劉瑞祥譯)，“液晶之基礎與應用”，國立編譯館出版 (2003).
[11] R. J. A. Tough and M. J. Bradshaw, “The determination of the order parameters of nematic liquid crystals by mean field extrapolation,” J. Phys. France 44, 447-454 (1983).
[12] L. M. Blinov, “Structure and Properties of Liquid Crystals,” Springer, New York (2011).
[13] H.-S. Kitzerow and C. Bahr, “Chirality in Liquid Crystals,” Springer, New York (2001).
[14] H. Keller, “History of liquid crystals,” Mol. Cryst. Liq. Cryst. 21, 1 (1973).
[15] G. W. Gray, “Thermotropic liquid crystals,” the Society of Chemical Industry (1987).
[16] W. H. de Jeu, “Physical properties of liquid crystalline materials,” Gordon &Breach (1980).
[17] P. Yeh and C. Gu, “Optics of liquid crystal displays,” John Wiley & Sons, Inc. (2006).
[18] P. G. de Gennes, and J. Prost, “The physics of liquid crystals,” Oxford University Press, New York (1993).
[19] G. Vertogen, “Elastic Constants and the Continuum Theory of Liquid Crystals,” Physica 117A, 227-231 (1983).
[20] V. Fréedericksz and A. Repiewa, “Theoretisches und Experimentelles zur Frage nach der Natur der anisotropen Flüssigkeiten,” Z. Phys. 42, 532 (1927).
[21] T. V. Galstyan, V. E. Drnoyan, and S. M. Arakelian, “Self-induced oscillations and asymmetry of the light angular spectrum in a dye doped nematic,” Phys. Lett. A 217, 52 (1996).
[22] A. Ryabchun and A. Bobrovsky, “Cholesteric Liquid Crystal Materials for Tunable Diffractive Optics”, Adv. Opt. Mater. 6, 1800335 (2018).
[23] C.-T. Wang, W.-Y. Wang, and T.-H. Lin, “A stable and switchable uniform lying helix structure in cholesteric liquid crystals,” Appl. Phys. Lett. 99, 041108 (2011).
[24] 李伯逸，“利用電控動態手紋結構製作雙穩態散射型液晶光閥之研究”，國立中央大學光電科學與工程學系 (2016).
[25] S. S. Choi, F. Castles, S. M. Morris, and H. J. Colesd, “High contrast chiral nematic liquid crystal device using negative dielectric material,” Appl. Phys. Lett. 95, 193502 (2009).
[26] R. B. Meyer, “Effects of electric and magnetic fields on the structure of cholesteric liquid crystals,” Appl. Phys. Lett. 12, 281-282 (1968).
[27] Y. Inoue and H. Moritake, “Dynamic control of colorful reflection toward practical cholesteric liquid crystal displays,” Opt. Express 24, 23027-23036 (2016).
[28] W. Helfrich, “Deformation of cholesteric liquid crystals with low threshold voltage,” Appl. Phys. Lett. 17, 531-532 (1970).
[29] J. P. Hurault, “Static distortions of a cholesteric planar structure induced by magnetic or ac electric fields,” J. Chem. Phys. 59, 2068-2075 (1973).
[30] D.-K. Yang and S.-T. Wu, “Fundamentals of liquid crystal devices,” John Wiley & Sons, Inc. (2015).
[31] G. Babakhanova, Z. Parsouzi, S. Paladugu, H. Wang, Y. A. Nastishin, S. V. Shiyanovskii, S. Sprunt, and O. D. Lavrentovich, “Elastic and viscous properties of the nematic dimer CB7CB,” Phys. Rev. E 96, 062704 (2017).
[32] 楊有承，“雙頻橫向螺旋膽固醇液晶之光電特性及其應用”，國立交通大學光電系統研究所 (2013).
[33] D. A. Paterson, M. Gao, Y.-K. Kim, A. Jamali, K. L. Finley, B. Robles-Hernández, S. Diez-Berart, J. Salud, M. Rosario de la Fuente, B. A. Timimi, H. Zimmermann, C. Greco, A. Ferrarini, J. M. D. Storey, D. O. López, O. D. Lavrentovich, G. R. Luckhurst, and C. T. Imrie, “Understanding the twist-bend nematic phase: the characterisation of 1-(4-cyanobiphenyl-4’-yloxy)-6-(4-cyanobiphenyl-4’-yl)hexane (CB6OCB) and comparison with CB7CB,” Soft Matter 12, 6827-6840 (2016).
[34] Y. Shin, Y. Jiang, Q. Wang, Z. Zhou, G. Qin, and D.-K. Yang, “Flexoelectric-effect-based light waveguide liquid crystal display for transparent display,” Photonics Res. 10, 407-414 (2022).
[35] D. M. Harrington, F. Snik, C. U. Keller, S. R. Sueoka, and G. van Harten, “Polarization modeling and predictions for DKIST part 2: application of the Berreman calculus to spectral polarization fringes of beamsplitters and crystal retarders,” J. Astron. Telesc. Instrum. Syst. 3, 048001 (2017).
[36] V. Belyakov, “Diffraction Optics of Complex-Structured Periodic Media,” Springer (2019).
[37] H. Yoshida, Y. Shiozaki, Y. Inoue, M. Takahashi, Y. Ogawa, A. Fujii, and M. Ozaki, “Threshold improvement in uniformly lying helix cholesteric liquid crystal laser using auxiliary π-conjugated polymer active layer,” J. Appl. Phys. 113, 203105 (2013).

指導教授

鄭恪亭(Ko-Ting Cheng)

審核日期

2022-9-15

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