本文選題：藍(lán)相液晶 + 高分辨率��； 參考：《東南大學(xué)》2016年博士論文

【摘要】：液晶既具有晶體的各向異性又具有液體的流動性,被廣泛的應(yīng)用于顯示、相位調(diào)制、信息存儲、光開關(guān)和光通信等領(lǐng)域,并對自適應(yīng)光學(xué)、集成光學(xué)的發(fā)展起到極大的促進(jìn)作用。但是,傳統(tǒng)的向列相液晶電光器件,響應(yīng)時(shí)間較長,通常在毫秒量級,甚至長達(dá)秒量級,限制液晶型電光器件的進(jìn)一步發(fā)展。藍(lán)相是一種介于各向同性相和膽甾相之間的特殊液晶相態(tài),具有亞毫秒量級的快速響應(yīng)速度,在新一代液晶顯示器、電控焦距可調(diào)液晶透鏡、液晶光柵、空間光調(diào)制器等電光器件中具有廣泛的應(yīng)用前景。因此,本文圍繞新型快速響應(yīng)的液晶電光器件展開研究,旨在采用新型的快速響應(yīng)液晶材料,研究其電光特性,針對藍(lán)相液晶器件的驅(qū)動電壓高、效率低等問題,設(shè)計(jì)和制備新型結(jié)構(gòu)的電光器件,實(shí)現(xiàn)低工作電壓,快速響應(yīng),高效率的藍(lán)相液晶電光器件。本文主要研究工作和成果概括如下：1.聚合物穩(wěn)定的藍(lán)相液晶材料制備及電光特性的研究。聚合物穩(wěn)定的藍(lán)相液晶一般包含三種主要成分：作為轉(zhuǎn)動分子的向列相液晶母體,提供螺旋力形成藍(lán)相態(tài)的手性劑和形成穩(wěn)定網(wǎng)絡(luò)結(jié)構(gòu)的聚合物單體。通過在一定的溫度下進(jìn)行紫外光固化,可以得到聚合物穩(wěn)定的藍(lán)相液晶。采用上述方法,我們成功制備了均勻的聚合物穩(wěn)定的藍(lán)相液晶,拓寬藍(lán)相液晶溫寬范圍至包含室溫在內(nèi)的-20℃-62℃。進(jìn)而,我們改變手性劑的含量,調(diào)節(jié)藍(lán)相液晶布拉格反射峰中心波長的峰值,得到不同布拉格反射峰的聚合物穩(wěn)定的藍(lán)相液晶材料,反射峰半波寬在幾十納米量級。同時(shí),我們也研究了各材料組分對藍(lán)相液晶電光特性的影響。在此基礎(chǔ)上,我們對不同聚合物單體含量的聚合物穩(wěn)定的藍(lán)相液晶進(jìn)行了動態(tài)響應(yīng)特性測試及分析,從而解釋了聚合物穩(wěn)定的藍(lán)相液晶材料的亞毫秒響應(yīng)特性及遲滯效應(yīng)的產(chǎn)生機(jī)理。2.高分辨率藍(lán)相液晶相位調(diào)制器件的研究。超高分辨率和快速響應(yīng)速度是液晶電光器件不斷追求的目標(biāo)。隨著分辨率的不斷提高,邊緣電場效應(yīng)(Fringing Electric Field Effect)和響應(yīng)時(shí)間成為液晶相位調(diào)制器件發(fā)展的主要制約因素。針對這兩個(gè)制約因素,本文首先對超高分辨率向列相液晶相位調(diào)制器的邊緣電場效應(yīng)進(jìn)行了系統(tǒng)的研究。繼而,將聚合物穩(wěn)定的藍(lán)相液晶與超高分辨率反射型液晶相位調(diào)制器件相結(jié)合,以實(shí)現(xiàn)亞毫秒快速響應(yīng)的液晶相位調(diào)制器件。在此基礎(chǔ)上,研究邊緣電場效應(yīng)對超高分辨率聚合物穩(wěn)定的藍(lán)相液晶相位調(diào)制器件調(diào)制性能的影響,提出了在邊緣電場作用下,藍(lán)相液晶相位調(diào)制器件是偏振相關(guān)的,優(yōu)化材料及結(jié)構(gòu)參數(shù),首次提出采用科爾系數(shù)且高飽和折射率的藍(lán)相液晶材料,優(yōu)化盒厚,能夠有效降低器件工作電壓,為聚合物穩(wěn)定的藍(lán)相液晶相位調(diào)制器件的實(shí)現(xiàn)提供理論基礎(chǔ)。進(jìn)一步,為了克服聚合物穩(wěn)定的藍(lán)相液晶的高電壓缺點(diǎn)及材料依賴性,并且解決超高分辨率下邊緣電場效應(yīng)帶來的相位偏移,我們設(shè)計(jì)新型的藍(lán)相液晶相位調(diào)制光學(xué)系統(tǒng),成功地降低驅(qū)動電壓至26.09 V,為實(shí)現(xiàn)硅基TFT驅(qū)動的反射型藍(lán)相液晶器件提供了可能。同時(shí)該系統(tǒng)能夠自動補(bǔ)償邊緣電場效應(yīng)帶來的相位偏移,有效改善超高分辨率的藍(lán)相液晶相位調(diào)制器件的調(diào)制特性,使硅基聚合物穩(wěn)定的藍(lán)相液晶(Polymer Stabilized Blue Phase Liquid Crystal on Silicon, PSBP-LCoS)相位調(diào)制器件成為可能。該成果已經(jīng)發(fā)表在期刊Optics Express和Applied Optics上。3.設(shè)計(jì)并制備了高衍射效率亞毫秒響應(yīng)的藍(lán)相液晶可調(diào)光柵。為了克服傳統(tǒng)向列相液晶可調(diào)光柵偏振依賴、響應(yīng)時(shí)間長和衍射效率低的不足,我們將藍(lán)相液晶與聚合物條狀光柵技術(shù)結(jié)合起來,設(shè)計(jì)并且制備了新型結(jié)構(gòu)的聚合物穩(wěn)定的藍(lán)相液晶可調(diào)光柵。該新型結(jié)構(gòu)利用毛細(xì)作用力將藍(lán)相液晶灌入聚合物條狀結(jié)構(gòu)的間隙中,得到理想的矩形光柵相位面分布,遠(yuǎn)場偶級次衍射效率基本為零,±1級最大衍射效率達(dá)38%,并且加電可調(diào)。同時(shí),該光柵具有偏振無關(guān)和亞毫秒的快速響應(yīng)速度。該成果已經(jīng)發(fā)表在期刊Journal of Applied Physics上。4.設(shè)計(jì)并制備了雙周期藍(lán)相液晶可調(diào)光柵。針對現(xiàn)有液晶可調(diào)光柵只能對衍射角度或者衍射效率進(jìn)行調(diào)節(jié)的不足,我們設(shè)計(jì)了新型的光柵結(jié)構(gòu),通過選擇不同的驅(qū)動方式,可以實(shí)現(xiàn)對衍射角度大小的控制,并且在每一個(gè)衍射角度下,衍射效率都可以由外加電壓來調(diào)節(jié),小周期光柵±1級最大衍射效率達(dá)35.3%,大周期光柵±1級最大衍射效率為28.7%,同時(shí)該新型結(jié)構(gòu)的光柵具有偏振無關(guān)和近亞毫秒的快速響應(yīng)速度,通過控制驅(qū)動方式,可以在時(shí)序上得到5個(gè)轉(zhuǎn)換口(Fan-out/Coherent),在光通信領(lǐng)域具有巨大的的應(yīng)用潛力。該成果已經(jīng)發(fā)表在期刊Optics Letters上。
[Abstract]:Liquid crystals have both the anisotropy of crystal and liquid flow, which are widely used in the fields of display, phase modulation, information storage, optical switching and optical communication, and play a great role in the development of adaptive optics and integrated optics. However, the traditional nematic liquid crystal electro-optic devices have a long response time, usually in milliseconds. The order of magnitude, or even the magnitude of the second, limits the further development of the liquid crystal optical devices. The blue phase is a special liquid crystal phase between the isotropic phase and the cholesteric phase. It has a fast response speed of sub millisecond magnitude. In the new generation of liquid crystal displays, electrically controlled focal length tunable liquid crystal lens, liquid crystal grating, spatial light modulator and other electro-optical devices. In this paper, a new fast response liquid crystal electro-optical device is studied in this paper. The purpose of this paper is to use a new type of fast response liquid crystal material to study the electro-optical characteristics. In view of the high driving voltage and low efficiency of the blue phase liquid crystal devices, the design and preparation of a new type of electro-optic devices to realize low working voltage. Fast response and efficient blue phase liquid crystal electro-optic devices. The main research work and achievements are summarized as follows: 1. the preparation of stable blue phase liquid crystal materials and the study of the electro-optic characteristics. The polymer stabilized blue phase liquid crystal usually contains three main components: the nematic liquid crystal matrix as a rotating molecule, which provides the spiral force formation blue. The phase of the chiral agent and the polymer monomer forming stable network structure. By UV curing at a certain temperature, a stable polymer blue phase liquid crystal can be obtained. Using the above method, we successfully prepared a uniform polymer stable blue phase liquid crystal, and widened the temperature range of the blue phase liquid crystal to -20 C -62, including room temperature. At the same time, we change the content of the chiral agent and adjust the peak of the central wavelength of the Prague reflection peak in the blue phase liquid crystal, and get the stable polymer blue phase liquid crystal material with different reflection peaks of the Prague. The reflection peak half wave width is at the order of dozens of nanometers. Meanwhile, we also study the influence of the material components on the electrooptic characteristics of the blue phase liquid crystal. At the same time, we test and analyze the dynamic response characteristics of the stable blue phase liquid crystals with different polymer monomers content, which explains the sub millisecond response characteristics and the mechanism of the hysteresis effect of the polymer stabilized blue phase liquid crystal material.2. high resolution blue phase liquid crystal phase modulation device. The fast response speed is the goal of the liquid crystal optical devices. With the continuous improvement of the resolution, the edge electric field effect (Fringing Electric Field Effect) and the response time are the main constraints for the development of liquid crystal phase modulation devices. In this paper, the phase modulation of the ultra high resolution nematic liquid crystal is first introduced. The edge electric field effect of the device is systematically studied. Then, the liquid crystal phase modulation devices with the fast response to the sub millisecond are realized by combining the polymer stabilized blue phase liquid crystal with the ultra high resolution reflective liquid crystal phase modulator. On this basis, the blue phase liquid crystal phase of the ultra high resolution polymer is studied by the edge electric field effect. Under the influence of the modulation performance of the bit modulation device, it is proposed that blue phase liquid crystal phase modulation devices are polarization dependent, optimize material and structure parameters under the effect of edge electric field. The blue phase liquid crystal materials with Cole coefficient and high saturation refractive index are first proposed to optimize the box thickness, which can reduce the voltage of the device and stabilize the blue phase of the polymer. The realization of liquid crystal phase modulation devices provides a theoretical basis. Further, in order to overcome the high voltage defect and material dependence of the blue phase liquid crystal stabilized by the polymer, and to solve the phase shift caused by the edge electric field effect at ultra high resolution, we design a new phase modulation optical system with blue phase liquid crystal, which successfully reduces the drive voltage to the high resolution. 26.09 V, it is possible to realize the reflective blue phase liquid crystal device driven by silicon based TFT, and the system can automatically compensate the phase shift caused by the edge electric field effect, improve the modulation characteristics of the blue phase liquid crystal phase modulation device with ultra high resolution, and make the Polymer Stabilized Blue Phase Li stabilized by the silicon based polymer. The quid Crystal on Silicon, PSBP-LCoS) phase modulator is possible. The results have been published in the Journal Optics Express and Applied Optics on.3. design and prepared a blue phase tunable grating with high diffraction efficiency submillisecond response. In order to overcome the polarization dependence, response time and diffraction efficiency of conventional nematic liquid crystal tunable grating The blue phase liquid crystal tunable grating with a new structure is designed and prepared by combining the blue phase liquid crystal with the polymer bar grating. The novel structure is used to use the capillary force to fill the gap between the blue phase liquid crystal into the polymer strip structure and obtain the ideal phase surface distribution of the rectangular grating and the far field couple. The diffraction efficiency of the gradation is basically zero, the maximum diffraction efficiency of the 1 grade is 38%, and the addition of electricity is adjustable. At the same time, the grating has a polarization independent and fast response speed of sub millisecond. The results have been published on the Journal Journal of Applied Physics to design and prepare a double periodic blue phase liquid crystal tunable grating. In order to adjust the diffraction angle or the diffraction efficiency, we designed a new type of grating structure. By choosing different driving modes, we can control the diffraction angle, and at each angle of diffraction, the diffraction efficiency can be adjusted by the applied voltage, and the maximum diffraction efficiency of the small periodic grating is 35.3%, The maximum diffraction efficiency of the large periodic grating + 1 is 28.7%. At the same time, the grating of the new structure has the polarization independent and fast response speed of near submillisecond. By controlling the driving mode, it can get 5 conversions (Fan-out/Coherent) on the time series. It has great potential application in the field of optical communication. The results have been published in the Journal Optics On Letters.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TN104.3

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