新型液晶光学相控阵的特性研究  

Study on Characteristics of a Novel Optical Phased Array based on Liquid Crystal

作　　者：戴竞[1] 张敏明[1] 何岩[2] 刘德明[1] 

机构地区：[1]华中科技大学光学与电子信息学院,武汉430074 [2]烽火通信科技股份有限公司,武汉430074

出　　处：《光子学报》2014年第2期55-60,共6页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.61107051);国家高技术研究发展计划(No.SS2012AA010407);国家科技支撑计划项目(2012BAH06B03);湖北省自然科学基金重点项目(No.2011CDA114)资助

摘　　要：将液晶作为平板光波导的上包层,构建了液晶光学相控阵器件.根据Frank-Oseen液晶连续体弹性形变理论与光栅衍射理论,研究分析了基于这种新型结构下液晶光学相控阵的传输特性,输出衍射特性和其它性能特性.研究结果表明,器件的传输电控相位延迟可以实现更大的光程差;阵列电极周期数目、电极宽度、电极间隔宽度等结构参量对器件的输出衍射光束的光强分布和半峰值全宽度影响很大,同时光束扫描的可行性得到论证;器件的响应时间提高了一个数量级,且其色散性能获得改善.为以后研制新型液晶光学相控阵提供了理论基础与技术设计依据.A novel optical phased array based on Liquid crystal was studied, and its structure scheme （eature is a planar wavegude with liquid crystal cladding. Propagation, output diffraction characteristics and other peformances of liquid crystal-optical phased array were all studied and analyzed according to Frank-Oseen continuum elastic theory and grating diffraction theory. The research results show that the electrical control phase delay of the device is quantitatively analyzed to obtain larger optical path difference; the period number of electrodes, elcetrode width, spacing of adjacent electrodes of the device are of great effect on the intensity distribution and the full width at half maximum of output diffraction beam, and the feasibility of beam scanning is also demonstrated; this novel strcture could improve the response time for an order of magnitude as well as wavelength dispertion of the device. These theoretical basis and technical design basis are favour of developing this novel liquid crystal-optical phased array in the future.

关 键 词：光学相控阵 液晶 光栅 衍射 扫描 响应时间 色散 

分 类 号：TN252[电子电信—物理电子学]