基于序参数与取向涨落的液晶电光开关  

Liquid Crystal Electro-Optic Switching Based on Order Parameter and Orientation Fluctuations

作　　者：孙路瑶 王鑫垚 陈佳浩 李超逸 马玲玲 李炳祥 陆延青[2] Sun Luyao;Wang Xinyao;Chen Jiahao;Li Chaoyi;Ma Lingling;Li Bingxiang;Lu Yanqing(College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing 210023,Jiangsu,China;College of Engineering and Applied Sciences,Nanjing University,Nanjing 210023,Jiangsu,China)

机构地区：[1]南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院,江苏南京210023 [2]南京大学现代工程与应用科学学院,江苏南京210023

出　　处：《光学学报》2022年第21期192-197,共6页Acta Optica Sinica

基　　金：国家重点研发计划青年科学家项目(2021YFA1202000);国家自然科学基金(RK106LH21001,52003115);江苏省自然科学基金(BK20212004,BK20200320)。

摘　　要：向列相液晶因其独特的光学和电学各向异性,广泛应用于光电显示等领域。光通信技术的持续发展,需要液晶材料具有更快的电光响应。通过对6种负性向列相液晶施加垂直于分子平均取向的电场,结合特殊入射方式,系统地研究了电场对液晶取向涨落和单轴序参数的调控。实验结果表明:电光响应的开关时间均小于350 ns;液晶的介电各向异性越大,场致双折射率变化越大,其最大值与所施加的电场大小和向列相液晶的介电各向异性均呈线性关系。Nematic liquid crystals(NLCs)have been widely used in the display industry and other electrooptical fields due to their unique optical and electrical anisotropies.The continuous development of optical communication requires faster electrooptic responses of liquid crystal materials.Here,we systematically explore the electrical modification of the orientation fluctuations and the uniaxial order parameter in six negative NLCs by applying electric fields perpendicular to the average molecular orientation and using a special incidence of light.Experimental results show that the switchingon time and switchingoff time of the electrooptic responses are smaller than 350 ns.The fieldinduced birefringence change rate of NLCs grows as the dielectric anisotropy increases.The maximum fieldinduced birefringence change rate is proportional to both the applied electric field and the nematic dielectric anisotropy.

关 键 词：光学器件 向列相液晶 介电各向异性 双折射率 序参数 取向涨落 电光开关 

分 类 号：O438[机械工程—光学工程]