基于带隙可调的二维光子晶体全光开关  

An All-Optical Switch Based on the Tunable Bandgap of a Two-Dimensional Photonic Crystal

作　　者：谭春华[1] 黄旭光[1] 

机构地区：[1]华南师范大学信息光电子科技学院光子信息技术广东省高校重点实验室,广东广州510006

出　　处：《光学学报》2010年第9期2714-2718,共5页Acta Optica Sinica

基　　金：广东省自然科学基金(07117866)资助课题

摘　　要：提出了一种新颖的制作二维光子晶体全光开关的方法。光子晶体波导通过往二维六角形分布的光子晶体的空气孔中填充偶氮苯掺杂液晶得到。数值模拟结果表明,通过外界光场控制空气孔中所填充的向列液晶的方向可以对光子晶体的方向能隙进行调节,这种可调节性可用于制作全光开关。与电场调制方法相比,该光控液晶取向技术具有响应速度快、结构简单的优点。A novel method to fabricate two-dimensional photonic crystal all-optical switch is reported. Photonic crystal waveguides can be obtained by infiltration of azobenzene-doped liquid crystals into air holes in two-dimensional photonic crystals composed of hexagonal lattices of air cylinders. Numerical simulations show that the photonic crystal band gaps are modulated by nematic liquid crystals infiltrated in the air holes. Then the band gap can be controlled easily under the influence of the external optic field. So the results can serve as an all-optical switch. Compared with the tunable method through an external electric field, the technique has the advantages of fast response and low cost.

关 键 词：光子晶体 液晶 平面波展开法 完全禁带 全光开关 

分 类 号：O437[机械工程—光学工程]