液晶光子晶体可调自准直特性研究  

Study on Tunable Self-collimation in Liquid-crystal-filled Photonic Crystals

作　　者：伍振海[1] 谢康[1] 江萍[1] 何修军[1] 

机构地区：[1]电子科技大学光电信息工程学院,成都610054

出　　处：《半导体光电》2012年第1期49-52,共4页Semiconductor Optoelectronics

基　　金：国家自然科学基金资助项目(41001020401)

摘　　要：液晶材料光子晶体由于具有可调谐性而得到了广泛的研究,但目前的研究主要集中在可调的光子带隙特性上。详细研究了液晶光子晶体的可调自准直特性。使用平面波展开法分析了液晶旋转角对光子晶体自准直频率的影响,并使用时域有限差分法对光在液晶光子晶体中的传输进行了仿真。结果表明,通过控制液晶旋转角,可以对光子晶体自准直频率进行调节,从而满足不同频率自准直的需要。Photonic crystals with liquid-crystal materials are extensively studied for their tunability.However,until now the studies mainly focus on the tunable photonic band gap properties.In this article,the tunable self-collimation in liquid-crystal-filled photonic crystals is discussed in detail.The impact of the twist angle of liquid crystals on the self-collimating frequencies is presented by using the plane wave expansion method.Moreover,the light propagation in the photonic crystal is simulated with the finite-difference time-domain method.The simulations show that the self-collimating frequencies are tunable by changing the liquid-crystal twist angle so that the self-collimating photonic crystals can be applied in different frequency bands.

关 键 词：光子晶体 自准直 可调 液晶 

分 类 号：O436[机械工程—光学工程]