摘要
为解决透射型偏振分束器透射效率低、高入射角度依赖的缺点,利用二维光子晶体平板设计了一种高效偏振分束器.采用的光子晶体是由空气中周期性排列的蜂窝格子GaAs介质柱构成.该偏振器对一种偏振光(TE偏振)正常折射,而对另一种偏振(TM偏振)负折射,从而实现两种偏振模式在空间上分离.为提高其透射效率,在光子晶体平板表面引入了消反层,并对相关参量进行优化.二维有限时域差分模拟结果显示,在较宽的角度范围内(约20°),约化圆频率处在ω=0.20～0.23×2πc/a范围内,分束器对TE和TM偏振光的透射强度都能达到95%以上.
To overcome disadvantages of low transmission efficiency and high dependence on the incident angle for the transmitting type polarization beam splitter（PBS）,a highly efficient PBS based on a two-dimensional photonic crystal slab is proposed,which consists of a honeycomb lattice of GaAs cylinders in air.The PBS has a normal refraction for TE polarization and a negative refraction for the other polarization（TM polarization）so that it can separate these two polarization beams totally in space.Anti-reflection layers（ARLs）at the surfaces of the photonic crystal slab are introduced and relevant parameters are optimized to improve the transmission efficiency.Two-dimensional finite difference time domain（FDTD）simulation results show that,in a wide angle range（about 20°）,in a normalized circular frequency range of ω=0.20~0.23×2πc/a,the transmission intensity can reach over 98% for both TE and TM polarization.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2010年第10期1795-1799,共5页
Acta Photonica Sinica
基金
中国矿业大学校基金(OK061065)资助
关键词
光子晶体
蜂窝格子
偏振分束器
消反层
Photonic crystals
Honeycomb lattice
Polarization Beam Splitter（PBS）
Anti-Reflection Layer（ARL）
