基于光子晶体的太赫兹环行器设计及其内带电效应研究

Design of terahertz circulator by using photonic crystals and its internal charging effects

对于卫星亚毫米波甚至太赫兹收发通信系统而言,由铁磁性器件构成的环行器和隔离器是实现功率隔离、保护发射通道不受反射功率影响的关键元器件。文章基于周期性光子晶体阵列,提出一种具有良好平面集成性的新型太赫兹环行器构型;并针对星载环境的电子辐照问题,采用典型能量电子辐照分析光子晶体Si的内带电特性、环行器整体电位以及局部电场分布特性。仿真结果表明,该环行器中心频率为205 GHz时,可在3 GHz带宽内实现电磁波定向不可逆传输的电性能,带内插入损耗小于0.5 dB,且受电子辐照带电的影响较小,在卫星高集成高密度太赫兹系统中具有较大的应用潜力。

The circulators and the isolators with ferromagnetic substrates are essential components for the satellite sub-millimeter and terahertz communication systems,which can protect the emission channel from the damage of high power reflection.This paper proposes a novel design of the terahertz circulator,based on the photonic crystals.The photonic crystals are made of several rows of high-permittivity dielectric rods,and they can be used for the terahertz wave guiding with a small conducting loss.In the space radiation environment,the internal charging characteristics of the photonic crystals Si and the terahertz crystals are simulated by the electron irradiation with typical energy and fluxes.The simulation results demonstrate that the central frequency,the bandwidth,and the insertion loss of the photonic crystal circulator is 205 GHz,3 GHz and less than 0.5 dB,respectively,with good spatial adaptability and promising in the space-born terahertz system application.