基于磁光子晶体的太赫兹滤波器和光开关  

Terahertz Filter and Optical Switch Based on Magnetic-Photonic Crystals

作　　者：梁龙学[1] 张晓金 吴小所[1] 张云霞 赵丹 Liang Longxue;Zhang Xiaojin;Wu Xiaosuo;Zhang Yunxia;Zhao Dan(School of Electronic and Information Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, Chin)

机构地区：[1]兰州交通大学电子与信息工程学院,甘肃兰州730070

出　　处：《光学学报》2018年第5期130-135,共6页Acta Optica Sinica

基　　金：国家自然科学基金(61366006)

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26.7ps,最大透射率仅为8%,关断效果明显,具有良好的开关特性。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.

关 键 词：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 

分 类 号：TN256[电子电信—物理电子学]