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太赫兹(THz)波是指频率介于0.1THz～10THz范围内的电磁波,即介于毫米波与红外线之间,太赫兹波有很多优越的特性,在国防、航天、医学等领域具有潜在的应用价值。本文设计了一种渐变的空气孔THz波光子晶体光纤,其包层由周期分布的渐变空气孔构成,芯区是去掉一个空气孔形成的缺陷。采用带有良匹配层(APML)吸收边界的全矢量时域有限差分法(finite-difference time-domain,FDTD)对其色散特性进行了数值分析,计算结果表明这种渐变空气孔光子晶体光纤具有较强的色散控制能力。
Terahertz (THz) waves are electromagnetic waves with frequencies in the range of 0.1 THz to 10 THz, that is, between millimeter waves and infra-red rays. THz waves have many excellent characteristics and have potential in the fields of defense, aerospace and medicine Value. In this paper, a tapered air hole THz photonic crystal fiber is designed. Its cladding is composed of periodic air holes of gradual change, and the core area is a defect formed by removing an air hole. The dispersion characteristics of the graded-hole photonic crystal fiber are numerically analyzed by finite-difference time-domain (FDTD) with a well-matched layer (APML) absorption boundary. The calculated results show that the graded-air- Strong dispersion control.