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采用平面波展开法和时域有限差分法研究了二维色散和各向异性磁化等离子体光子晶体的色散特性.当波矢在周期平面时,由于外加磁场的作用使TE模的色散曲线出现两个不同区域的平带,改变磁场的大小不但可以控制平带的位置,而且可以控制光子带隙的位置和大小.增大背景材料的介电常数,可以形成全方向光子带隙,随着背景材料介电常数的增加,带隙的中心位置降低但带隙宽度增加.当波矢偏离周期平面时,色散曲线不再分为TE和TM模,随着非周期平面波矢的增加,带隙位置上移,带隙宽度先增加随后基本保持不变.
The dispersion characteristics of two-dimensional dispersive and anisotropic magnetized plasma photonic crystals are studied by the plane wave expansion method and the finite-difference time-domain method. When the wave vector is in the periodic plane, the dispersion curve of TE mode appears two Different regions of the flat belt, changing the size of the magnetic field can not only control the position of the flat belt, but also control the position and size of the photonic band gap.Enhance the dielectric constant of the background material can form an omnidirectional photonic bandgap, with the background material When the wave vector deviates from the periodic plane, the dispersion curve is no longer divided into TE and TM modes. With the increase of the non-periodic plane wave vector, the band gap position Shift, the band gap width increases first and then remains basically unchanged.