一维磁流体掺杂光子晶体缺陷模的磁控可调特性  

Characteristics of magnetic-controlled tuning in doping one-dimensional magnetic fluid photonic crystal defect mode

作　　者：郝丽丽[1] 谢应茂[1] 

机构地区：[1]赣南师范学院物理与电子信息学院光电子材料与技术研究所,江西赣州341000

出　　处：《量子电子学报》2015年第3期347-351,共5页Chinese Journal of Quantum Electronics

基　　金：江西省教育厅科技项目(GJJ13660);江西省研究生创新专项基金项目(YC2013-S262)

摘　　要：磁流体的有效介电常数ε_（liq）与磁性粒子体积分数P和外加磁场因子α_‖有关。计算了水基MnFe_2O_4磁流体的有效折射率随纳米磁性粒子体积分数P和外加磁场强度因子α_‖的变化关系,发现通过调节α_‖的大小可实现不同纳米磁性粒子体积分数的磁流体具有相同的有效折射率。应用传输矩阵法,数值模拟了水基MnFe_2O_4磁流体中P为0.745时结构为（AB）~8C（BA）~8的一维磁流体掺杂光子晶体的透射谱。结果表明：缺陷模磁流体n_c的增大出现红移现象,即缺陷模中心波长随n_c的增大而变长,最大改变量为36.6 nm。讨论了缺陷模品质因子Q,发现缺陷模半峰值带宽不变,Q与缺陷模波长随n_c的变化具有相同的线性变化特性,即Q随有效折射率的增大而增大。The effective dielectric constant Cliq of magnetic fluid is related to the volume fraction P of the magnetic nanoparticles and the factor all of magnetic field. The changing relation of water-based MnFe2O4 nanoparticle magnetic fluid effective refractive index with the Volume fraction of the magnetic nanoparticles P and the factor of magnetic field all was caculated. It was found that by adjusting all, the magnetic fluid has the same effective refractive index in difference of volume fraction of the magnetic nanoparticles. The transmission spectrum of doping one-dimensional water-based MnFe204 magnetic fluid photonic crystal, when P is 0.745 and the structure is （AB）SC（BA）s, is numerically simulated by transfer matrix method. The results indicate that the wavelength of defect mode shifts to the side of long waves as increasing of nanoparticle magnetic fluid effective refractive index no. That is, the wavelength of defect modes increase as increasing of nc. The amount of redshift is 36.6 nm. The quality factor Of defect mode was disscused. It＇s found that half of the peak bandwidth A~ is a constant. The quality factor of defect mode Q and the wavelength of defect mode A have the same characteristics of linear with the change of no. That is, Q increases with the increasing of nc.

关 键 词：光电子学 磁流体光子晶体 传输矩阵法 缺陷模 品质因子 

分 类 号：O734[理学—晶体学]