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运用频域有限元法研究了一种二维正三角晶格金属光子晶体在太赫兹波段的传输特性。该模型选取空气为背景材料,金属铜为介质柱。通过改变太赫兹波的入射方向、晶格常数和介质柱填充率,对TM模和TE模的传输特性进行了系统完整的分析,获得了太赫兹波在正三角晶格金属光子晶体中的传输规律。结果表明,传输特性随着介质柱填充率、晶格常数及太赫兹波入射方向的变化而变化,且TE模和TM模带隙差异很大,这为太赫兹波段的光子晶体滤波器、反射器和极化器的开发与制作提供了参考依据。
The transmission characteristics of a two-dimensional regular triangular lattice photonic crystal in the terahertz wave band are studied by using the finite-element method in frequency domain. The model chooses air as the background material and the metallic copper as the dielectric column. The transmission characteristics of TM mode and TE mode are analyzed systematically by changing the incident direction, lattice constant and filling rate of terahertz wave, and the propagation of terahertz wave in the normal triangular lattice metal photonic crystal is obtained law. The results show that the transmission characteristics change with the filling rate of the dielectric column, the lattice constant and the incident direction of the terahertz wave, and the band gaps of the TE mode and the TM mode are quite different. This is a photonic crystal filter with terahertz band, The development and manufacture of polarizers and polarizers provide a reference.