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随着现代移动流量的剧烈增长,未来无线THz通信传输速率需求将会达到数十Gb/s,高速THz波调制器的研宄对于THz无线通信系统具有重要意义.本文提出了一种新型的磁化等离子体THz波调制器,在二维光子晶体中引入线缺陷和填充锑化铟材料的点缺陷.基于法拉第磁光效应,由于锑化铟材料的回旋角频率落在THz频段,在外加磁场的作用下点缺陷表面可在THz频段形成磁化等离子体.当外加磁场与TE波传输方向平行时,单频光在谐振腔中分裂成左旋和右旋圆偏振光,二者的谐振频率差异随着外加磁场强度的增加而增大.控制外加磁场的有无便可实现缺陷模迁移型THz波调制器.利用时域有限差分法和有限元法分析其时域稳态场强分布和模场分布,结果表明当外加磁场强度为0和0.8 T时,可实现THz的通、断调制,消光比高达25.4 dB,插入损耗仅为0.3 dB,调制速率高达4 GHz.该器件在未来THz无线宽带通信中着巨大的潜力和应用.
With the dramatic increase of modern mobile traffic, the demand for wireless THz communication transmission rate will reach tens of Gb / s in the future, and the research on high speed THz wave modulator is of great significance for THz wireless communication system.This paper presents a new type of magnetization The plasma THz wave modulator introduces a line defect in the two-dimensional photonic crystal and a point defect filling the indium antimonide material.Based on the Faraday magneto-optic effect, since the gyration angular frequency of the indium antimonide material falls in the THz frequency band, When the applied magnetic field is parallel to the TE wave transmission direction, the single-frequency light splits into left-handed and right-handed circularly polarized light in the resonant cavity, and the difference in resonant frequency between the two The strength of the applied magnetic field increases and the presence or absence of the applied magnetic field can achieve the defect mode shift THz-wave modulator.The finite-element time-domain method and the finite element method are used to analyze the time-domain steady-state field strength distribution and the mode field distribution The results show that when the applied magnetic field strength is 0 and 0.8 T, THz can be switched on and off, the extinction ratio is as high as 25.4 dB, the insertion loss is only 0.3 dB, and the modulation rate is up to 4 GHz. Broadband communications with huge potential and applications.