可调缺陷层等离子体光子晶体的滤波特性分析

Filter Property Analysis of Plasma Photonic Crystals with Tunable Defect

等离子体光子晶体中引入另一种缺陷等离子体层,构成一种新的等离子体光子晶体滤波器。在不需改变等离子体光子晶体几何外形尺寸的情况下,通过改变缺陷等离子体层的参数,实现缺陷等离子体等效折射率改变,使等离子体光子晶体缺陷层的谐振频率发生偏移,实现了滤波器的可调谐特性。数值模拟中采用时域有限差分算法,计算了电磁波通过等离子体光子晶体的透射谱。结果表明通过调控缺陷层等离子体参数,使缺陷层的谐振频率发生偏移,从而实现等离子体光子晶体可调滤波特性。

To form a new kind of Plasma Photonic Crystals （PPCs） filters, a plasma defect layer was filled in the PPCs. The effective refractive index can be changed by alternating the electrical parameters of the defect instead of changing the dimension of PPCs, which makes the resonant frequency in plasma defect layer offset. Then the filter frequency can be tuned. A Finite-difference Time-domain （FDTD） algorithm is applied to calculate the transmission spectrum of the plasma photonic crystals. The result show that the tunability of the PPCs filters can be achieved by changing the parameters of the plasma defect layer which changes the resonance frequency.