用时域有限差分(Finite-Different Time-Domain, FDTD)的分段线形电流密度卷积(Piecewise Linear Current Density Recursive Convolution, PLCDRC)算法研究了含单一介质缺陷层的一维非磁化等离子体光子晶体的滤波特性。从频域角度分析得到微分高斯脉冲的透射系数，在等温近似的条件下，讨论了等离子体的弛豫时间、温度和频率为可调谐参数时的滤波特性。计算结果表明，改变等离子体弛豫时间和频率可以实现对滤波通道的调整，而改变等离子体温度不能实现对谐振频率的调节。

The piecewise linear current density recursive convolution finite-different time-domain method is applied to study the filtering properties of one dimension tunable unmagnetized plasma photonic crystals with single defect layer. In frequency domain, the transmission coefficients of electromagnetic differential Gaussian pulses are computed, and under the isothermal hypothesis, the plasma relaxation time, plasma temperature and plasma frequency are taken as the tunable parameters to study the effects of filtering properties. The results are as follows: the filter channel can be tuned by changing relaxation time and frequency of plasma,while the resonant frequency can not be tuned by changing plasma temperature.