光学学报, 2018, 38 (5): 0513002, 网络出版: 2018-07-10
基于磁光子晶体的太赫兹滤波器和光开关 下载: 1163次
Terahertz Filter and Optical Switch Based on Magnetic-Photonic Crystals
集成光学 太赫兹(THz)滤波器 平面波展开(PWE)法 光开关 时域有限差分(FDTD)法 integrated optics terahertz filter plane wave expansion (PWE) method optical switch finite-difference time-domain (FDTD) method
摘要
设计了基于石榴石型铁氧体磁性材料的光子晶体滤波器和光开关。利用平面波展开(PWE)法,分析了特定半径下光子晶体的能带结构,利用时域有限差分(FDTD)法分析了磁场改变时磁性材料耦合频率的变化。结果表明,该器件在不加磁场时具有优良的选频滤波功能,各目标光信号的透射率均达90%以上,且信道串扰小;加磁场后,耦合腔的耦合频率改变,器件处于关断状态。该器件的关断最大稳定时间达26.7 ps,最大透射率仅为8%,关断效果明显,具有良好的开关特性。
Abstract
The photonic crystal filter and optical switch are designed based on the garnet-type ferrite magnetic material. The band structure of the photonic crystal with a specific radius is analyzed by the plane wave expansion method (PWM), and the change of coupling frequency of magnetic materials with the magnetic field is analyzed by the finite-difference time-domain (FDTD) method. The results show that, when the magnetic field is not added, this device has excellent frequency selection and filtering functions, the transmissivity of each target light signal is above 90% and the channel crosstalk is small. After the addition of the magnetic field, the coupling frequency of the coupling cavity changes and the device is in a closed state. The maximum stable closing time of this device is 26.4 ps and the maximum transmissivity is only 8%, which indicates that the cut-off effect is obvious and it possesses a good switching characteristic.
梁龙学, 张晓金, 吴小所, 张云霞, 赵丹. 基于磁光子晶体的太赫兹滤波器和光开关[J]. 光学学报, 2018, 38(5): 0513002. Longxue Liang, Xiaojin Zhang, Xiaosuo Wu, Yunxia Zhang, Dan Zhao. Terahertz Filter and Optical Switch Based on Magnetic-Photonic Crystals[J]. Acta Optica Sinica, 2018, 38(5): 0513002.