臺灣博碩士論文加值系統

在實驗中我們製作出萬花筒圖斑的液晶光柵。樣本為偶氮染料摻雜向列型液晶之水平排列液晶樣本，利用特製的多孔光罩達到簡化綠光雷射之多光干涉的實驗架設，利用在實驗架設中加入TN (twisted nematic)樣本來實現左右旋圓偏振干涉之偏振光，利用了偶氮染料分子照光後會轉向至垂直光偏振方向並吸附在基板的特性，染料分子經賓主效應拉動液晶分子產生不同的液晶排列，因而製作出萬花筒圖斑的液晶光柵。我們使用了紅光雷射量測液晶萬花筒圖斑偏振光柵的繞射圖、電壓對穿透度曲線(T-V curve)及不同偏振對繞射點的影響，使用2孔光罩時可以達到最高的一階繞射效率。

In our experiment, we fabricated a liquid crystal (LC) grating with kaleidoscope patterns. The sample was an azo-dye-doped nematic LC sample with homogeneous alignment layers. We used a specially designed porous photomask to simplify the setup for multi-beam interference with green laser light. By incorporating a twisted nematic (TN) sample into the setup, left- and right-handed circularly polarized light interference was achieved. Utilizing the characteristic of azo dye molecules, which reorient to the direction of vertically polarized light and adsorb on the substrate upon illumination, the dye molecules induced different LC alignments through the guest-host effect, thereby fabricating a LC grating with kaleidoscope-like patterns. We used a red laser to measure the diffraction pattern of the LC kaleidoscope grating, the voltage-transmittance curve (T-V curve), and the effect of different polarizations on the diffraction points. Using a two-hole photomask, the highest first-order diffraction efficiency could be achieved.

中文摘要.....i
英文摘要.....ii
誌謝.....iii
目錄.....iv
圖目錄.....vi
符號說明.....ix
第一章 緒論.....1
第二章 液晶簡介.....2
2.1 液晶的起源.....2
2.2 液晶的定義.....2
2.3 液晶的分類.....3
2.3.1 盤狀分子.....3
2.3.2 棒狀分子.....4
2.4 液晶的物理.....8
2.4.1 光學異向性.....8
2.4.2 介電異向性.....10
2.4.3 溫度的影響.....11
2.4.4 連續彈性體理論.....12
2.4.5 Freedericksz transition.....13
2.6 液晶的相位延遲.....13
第三章 相關理論.....16
3.1 偶氮染料光致同素異構化反應.....16
3.2 染料分子引致液晶轉動機制.....16
3.2.1 正力矩效應.....16
3.2.2 負力矩效應.....17
3.2.3 偶氮染料吸附引致轉動.....18
3.3 溝槽理論.....18
3.4 繞射.....19
3.5 Quasi-crystal圖斑.....19
3.6 光柵理論.....19
第四章 樣本製作與實驗架設.....21
4.1 材料介紹.....21
4.2 樣本製作.....22
4.3 實驗架設.....23
第五章 結果與討論.....29
5.1 樣本的初始排列.....29
5.2 樣本單孔吸附.....29
5.3 正交圓偏振形成的線偏振光.....31
5.4 q=2之樣本成果(1L1R).....32
5.5 q=4之樣本成果(2L2R).....35
5.6 q=6之樣本成果(3L3R).....39
5.7 q=8與q=10之樣本成果(4L4R & 5L5R).....41
第六章 結論.....43
參考文獻.....44

[1]H. W. Chen, J. W. Lee, B. Y. Lin, S. Chen, and S. T. Wu, "Liquid crystal display and organic light-emitting diode display: present status and future perspectives", Light: Science & Applications, 7, 17168 (2018).
[2]Z. Zhang, Z. You, and D. Chu, "Fundamentals of phase-only liquid crystal on silicon (LCOS) devices", Light: Science & Applications, 3, e213 (2014).
[3]G. Milione, T. A. Nguyen, J. Leach, D. A. Nolan, and R. R. Alfano, "Using the nonseparability of vector beams to encode information for optical communication", Optics letter, 40, (21), 4887-4890 (2015).
[4]T. Jani and T. Jari, "Paraxial-domain diffractive elements with 100% efficiency based on polarization gratings", Optics letter, 25, (11), 785-786 (2000).
[5]C. Provenzano, P. Pagliusi, and G. Cipparrone, "Highly efficient liquid crystal based diffraction grating induced by polarization holograms at the aligning surfaces", Applied Physics Letter, 89, 121105 (2006).
[6]C. Oh and M. J. Escuti, "Numerical analysis of polarization gratings using the finite-difference time-domain method", Physical Review A, 76, 043815 (2007).
[7]J. Kim, K. Komanduri, F. Lawler, D. J. Kekas, and M. J. Escuti, "Efficient and monolithic polarization conversion system based on a polarization grating", Applied Optics, 51, (20), 4852-4857 (2012).
[8]J. Kim, C. Oh, and M. J. Escuti, "Wide-angle, nonmechanical beam steering with high throughput utilizing polarization gratings", Applied Optics, 50, (17), 2636-2639 (2011).
[9]P. J Collings and M. Hird, "Introduction to Liquid Crystal ", Taylor & Francis, London (1997).
[10]P. G. de Gennes and J. Prost, "The Physics of Liquid Crystals", 2nd ed., Clarendon Press, Oxford (1993).
[11]M. Blinov and V. G. Chigrinov, "Electrooptic Effects in Liquid Crystal Materials", Springer-Verlag, New York (1994).
[12]郭建宏，2005， “摻雜染料光配向基板上之複合型配向液晶相位光柵之製作及其光電特性研究”，國立成功大學物理研究所碩士論文。
[13]黃三宜，2006， “聚合物表面引致快速吸附達成液晶光柵光開關” , 國立成功學物理研究所碩士論文。
[14]P. Yeh and C. Gu, "Optics of Liquid Crystal Displays", A Wiley Interscience Publication, New York (1999).
[15]李美儒，2004，“摻雜偶氮染料之向列相液晶薄膜在雙光子光柵下引致的光折變效應”，國立成功大學物理研究所碩士論文。
[16]Iam-Choon Khoo, "Liquid Crystals-Physical Properties and Nonlinear Optical Phenomena", John Wiley & Sons, New York (1995).
[17]周韋豪，2013，“利用摻雜矽奈米粒子之液晶製作相位延遲板”，國立虎尾科技大學光電與材料科技碩士班碩士論文。
[18]P. A. Blanche, Ph. C. Lemaire, C. Maertens, P. Dubois, and R. Jerome, "Polarization holography reveals the nature of the grating in polymers containing azo-dye", Optics communications, 185, (1), 1-12 (2000).
[19]I. Janossy, L. Csillag, and A. D. Lloyd, "Temperature dependence of the optical Freedericksz transition in dyed nematic liquid crystals", Physical Review A, 44, (12), 8410-8413 (1991).
[20]W. M. Gibbons, T. Kosa, P. P. Muhoray, P. J. Shannon, and S. T. Sun, "Continuous grey-scale image storage using optically aligned nematic liquid crystals", Nature, 377, 43-46 (1995).
[21]W. M. Gibbons, P. J. Shannon, S. T. Sun, and B. J. Swetlin, "Surface-mediated alignment of nematic liquid crystals with polarized laser light", Nature, 351, 49-50 (1991).
[22]D. W. Berreman, 1972, "Solid surface shape and the alignment of an adjacent nematic liquid crystal", Physical Review Letters, 28, 1683 (1672).
[23]F. Simoni, O. Francescangeli, Y. Reznikov, and S. Slussarenko, "Dye-doped liquid crystals as high-resolution recording media", Optics Letters, 22, (8), 549-551 (1997).
[24]張志宏，2005，“全像光柵在摻雜含偶氮染料於多相態液晶之研究”，國立中山大學物理研究所碩士論文。
[25]林利娟， 2011， “光學中萬花筒圖斑的形成”，國立交通大學理學院應用科技學 程碩士論文
[26]陳文政，2009，“摻雜奈米粒子及偶氮染料的液晶薄膜之光配向研究及應用”，國立中山大學光電工程學系碩士論文。
[27]鄭恪亭，2006，“偶氮染料摻雜液晶薄膜之雙光子效應研究及其應用”，國立成功大學物理學系博士論文。