渐近式太赫兹多孔光子晶体光纤模式特性研究

Study on mode characteristics of asymptotic terahertz porous photonic crystal fibers

为了研究太赫兹波在新型渐近式多孔光子晶体光纤的传输特性,采用有限元数值分析法进行了数值仿真,分析了有效模态面积、纤芯孔隙度对有效材料损失及限制损耗、功率分布分数等波导特性的影响.结果表明,在单模传输范围0.5THz^0.85THz内,通过在光纤上引入渐近矩形阵列气孔和椭圆空穴,实现了零色散、0.0532高双折射、有效材料损失为0.1157/cm,限制损耗低至1.47×10^-4dB/cm.此研究可用于制造极化THz波导、滤波器等,对新一代太赫兹波导实现长距离、高性能传输的研究具有重要意义.

In order to study transmission characteristics of terahertz wave in new asymptotic porous photonic crystal fibers, finite element numerical analysis method was used for numerical simulation. The effects of effective mode area and core porosity on effective material loss, confinement loss and power distribution fraction were analyzed. The results show that, within the range of 0. 5THz to 0. 85THz, by introducing an asymptotic rectangular array of holes and elliptical holes into the optical fiber, zero dispersion, high birefringence of 0. 0532, effective material loss of 0. 1157/cm and confinement loss of 1.47 ×10 ^-4 dB/cm are achieved. This study can be used to fabricate polarized THz waveguides, filters, etc. It is of great significance to study the long-distance and high-performance transmission of the new generation terahertz waveguides.