垂直入射空变等离子体光子晶体带隙特性研究

Bandgap characters of spacevarying plasma photonic crystals in normal incidence

摘要: 采用改进的磁化等离子体电磁散射的时域有限差分（FDTD）算法，分别研究了一维空变磁化和非磁化等离子体光子晶体（PPC）的禁带特性.以微分高斯脉冲为激励源，计算了等离子体光子晶体的反射系数和透射系数.讨论了在垂直入射情况下等离子体频率随空间呈脉冲形式变化的周期函数对禁带的影响.结果表明：通过改变等离子体频率在空间的不同变化可以实现对禁带的控制.

Abstract: By using the modified finitedifference timedomain (FDTD) method for the electromagnetic scattering of the magnetized plasma, the band gap properties of the onedimensional spacevarying magnetized and unmagnetized plasma photonic crystals (PPC) are studied. With the differential Gaussian pulse for the incidence source, the reflection coefficients of the PPC are computed with the normal incidence condition, and its plasma frequency varies with the space as the variation of the periodic Gauss pulse function.The characteristics for the forbidden band gap of the PPC are analyzed under the condition of the different space pulsewidth. The results show that the band gap can be achieved on control by changing the plasma frequency in different space changes.