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把“啁啾”函数引入含左手材料的一维光子晶体中,且左手材料的介电常数和磁导率采用Lossy Dryde model,利用传输矩阵法研究了其透射谱。结果表明:在“啁啾”函数对材料几何厚度调制较小时,该光子晶体有完整的禁带,随着调制的加强,禁带宽度增加,但底部逐步抬高。在相同的调制下,磁、电等离子体频率的比值越大,禁带宽度越宽。入射角增加,TE模的禁带宽度不变而TM模的禁带宽度变窄,TE模和TM模均产生了角度隙,此角度隙的宽度随入射角增加而变宽,且TM模的变化大于TE模的。周期数N变化时,角度隙基本不变。nR的变化对禁带和角度隙的位置没有影响,但nR越小,禁带底部越高且圆,角度隙中透射峰峰值越大。
The “chirp” function is introduced into a one-dimensional photonic crystal with left-handed material. The dielectric constant and permeability of the left-handed material are calculated by using the Lossy Dryde model and the transmission spectra of the left-handed material are studied. The results show that the photonic crystal has a complete forbidden band when the chirp function modulates the thickness of the material. With the increase of the modulation, the forbidden band width increases, but the bottom of the photonic crystal increases gradually. Under the same modulation, the greater the ratio of magnetic and electrical plasma frequencies, the wider the forbidden band width. As the incident angle increases, the forbidden band width of the TE mode keeps unchanged and the forbidden band width of the TM mode narrows. Both the TE mode and the TM mode generate an angular gap, and the width of the angle gap broadens with the increase of the incident angle. Change is greater than TE mode. When the number of cycles N changes, the angular gap is basically unchanged. The change of nR has no effect on the position of the forbidden band and the angular gap, but the smaller the nR, the higher the bottom of the band gap and the larger the peak of the transmission peak in the circular and angular gaps.