In order to demonstrate the modulation of terahertz wave propagation in atmospheric pressure microplasmas, in this work, the band structure and the transmission characteristics of a one-dimensional collisional microplasma photonic crystal are investigated, using the transfer matrix method. For a lattice constant of 150 μ m and a plasma width of 100 μ m, three stopbands of microplasma photonic crystal are observed, in a frequency range of 0.1–5 THz. Firstly, an increase in gas pressure leads to a decrease in the central frequency of the stopband. When the gas pressure increases from 50.5 kPa to 202 kPa, the transmission coefficient of the THz wave first increases and then decreases at high frequency, where the wave frequency is much greater than both the plasma frequency and the collision frequency. Secondly, it is interesting to find that the central frequency and the bandwidth of the first THz stopband remain almost unchanged for electron densities of less than 10

中文翻译：

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碰撞微等离子体光子晶体对太赫兹波传播调制的数值研究

为了证明太赫兹波在大气压微等离子体中的调制，本文采用转移矩阵方法研究了一维碰撞微等离子体光子晶体的能带结构和传输特性。对于150μm的晶格常数和100μm的等离子体宽度，观察到三个等离子光子晶体的阻带，频率范围为0.1–5 THz。首先，气压的增加导致阻带中心频率的降低。当气压从50.5 kPa增加到202 kPa时，太赫兹波的传输系数在高频时首先增大，然后减小，此时该波频率远大于等离子频率和碰撞频率。其次，