摘要
针对传统光学元件存在体积大、带宽窄、加工难度大等问题,设计了一种U形结构纳米阵列的反射型1/4波片。运用三维时域有限差分(FDTD)法,分析了不同几何单元尺寸对光学反射特性的影响。通过调节U形纳米天线的几何尺寸,能很好地控制反射电场的振幅和相位分量。通过优化设计,在1.55μm波长处实现了1/4波片的功能。所对应的反射率高达87.5%,波片厚度只有160nm,并且在180nm的超宽波长范围内,2个正交方向的相位差变化低于π/2的2%。
Aiming at the narrow bandwidth and difficult process,a reflective 1/4waveplate based on U-shaped nanoarray is proposed.Three-dimensional finite-difference time-domain（FDTD）method is used to analyze the influence of different geometries cell to the optical reflection characteristics.By adjusting the geometric dimensions of U-shaped nanoantenna,the amplitude and the phase of the reflected field can be well controlled.By optimizing U-shaped nanoantenna geometry,aquarter-wave plate functions are realized with high reflectance（87.5%）and wide bandwidth（180nm）at the wavelength of 1.55μm.Furthermore,the thickness of the quarter-wave plate is 160 nm and the phase difference is less than 2% when the wavelength range is 180 nm.
出处
《桂林电子科技大学学报》
2016年第3期248-252,共5页
Journal of Guilin University of Electronic Technology
基金
广西自然科学基金(2014GXNSFAA118283)
广西信息科学实验中心主任基金(YB1505)
关键词
时域有限差分法
U形纳米阵列
1/4波片
finite-difference time-domain method
U-shaped nanoarray
quarter-wave plate
