电可调谐的聚合物液晶光子晶体  

Electrically switchable polymer dispersed liquid crystal photonic crystals

作　　者：孙晓红[1] 陶肖明[2] 

机构地区：[1]郑州大学河南省激光与光电信息技术重点实验室,河南郑州450052 [2]香港理工大学纺织制衣学系

出　　处：《量子电子学报》2010年第4期424-429,共6页Chinese Journal of Quantum Electronics

基　　金：香港纺织服装研究协会和创新科技委员会基金项目(GHP/043/07TP);郑州大学引进人才基金;河南省中青年骨干教师基金资助项目

摘　　要：设计了一个无顶的(top-cut)六角棱镜,高h为3.73 cm,侧面与底面夹角α为66°。利用此棱镜和光全息刻蚀的方法,在光抗材料上制作了对称六角结构、蜂窝结构和椭圆柱非对称等结构的光子晶体(PhC);并且在聚合物分散液晶(PDLC)材料上制作了大面积电可调谐的PhC结构。PhC的理论干涉模式和实验制作结构相比较,结果吻合得非常好。研究了PhC的远场衍射模式和电转换特性,对称的六角衍射模式更好地揭示了PhC的六角结构。晶体结构中液晶微滴的尺寸最小可到10 nm,直流转换电压最小达到13.3 V/μm。A top-cut hexagonal prism （TCHP） was designed with a height h = 3.73 cm and a cross angle α = 66° between side face and the base. By using the TCHP and holographic lithography, various photonic crystals （PhCs） were fabricated including symmetrical hexagonal structure, honeycomb structure and asymmetrical structures with elliptical rods in photo-resist film. Large area of electrically switchable PhCs were also obtained in polymer dispersed liquid crystal （PDLC） film. A good agreement is obtained for PhC structures between theoretical modeling and experimental results. Furthermore, far-field diffraction patterns and electrical switching characteristics were also investigated. The smallest droplets of liquid crystals is 10 nm. The switching voltage can be decreased to 13.3 V/μm.

关 键 词：全息 光子晶体 无顶六角棱镜 聚合物分散液晶 电转换 

分 类 号：O438[机械工程—光学工程]