| Abstract: | In order to demonstrate the modulation of terahertz wave propagation in atmospheric pressuremicroplasmas, in this work, the band structure and the transmission characteristics of a onedimensionalcollisional microplasma photonic crystal are investigated, using the transfer matrixmethod. For a lattice constant of 150 μm and a plasma width of 100 μm, three stopbands ofmicroplasma photonic crystal are observed, in a frequency range of 0.1–5 THz. Firstly, anincrease in gas pressure leads to a decrease in the central frequency of the stopband. When thegas pressure increases from 50.5 kPa to 202 kPa, the transmission coefficient of the THz wavefirst increases and then decreases at high frequency, where the wave frequency is much greaterthan both the plasma frequency and the collision frequency. Secondly, it is interesting to find thatthe central frequency and the bandwidth of the first THz stopband remain almost unchanged forelectron densities of less than 1015 cm–3, increasing significantly when the electron densityincreases up to 1016 cm–3. A central frequency shift of 110 GHz, and a bandgap broadening of200 GHz in the first stopband are observed. In addition, an atmospheric pressure microplasmawith the electron density of 1 × 1015–6 × 1015 cm–3 is recommended for the modulation of THzwave propagation by plasma photonic crystals. |
