Design and experiment of cyclic olefin copolymer based 2.5 THz hollow-core photonic crystal fiber
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摘要: 采用全矢量有限元法，仿真设计了一种工作在2.5 THz频段的中空芯太赫兹光子晶体光纤，用环烯烃聚合物材料（COC）制备了光纤样品，利用CO2激光泵浦气体太赫兹源搭建了测试平台并对光纤的太赫兹波传输性能进行了测试。实测光纤最低损耗0.17 dB/cm、平均损耗约0.5 dB/cm，在弯曲90情况下光纤传输损耗波动小于5%，具有良好的可弯曲性；光纤输出端口的模场分布测试结果表明，光纤是以主模进行传输，太赫兹能量很好地被束缚在光纤芯中。Abstract: Efficient transmission of terahertz (THz) wave is an important research direction in development of THz technology. Polymeric photonic crystal fiber (PCF) is ideal in THz waveguide transmission because of the advantages of low loss, low dispersion and fine flexibility to bend. Based on the full vector finite element method (FEM), a hollow-core PCF with operating frequency of 2.5 THz is designed. Some samples made of cyclic olefin copolymer (COC) are fabricated. The fiber transmission performance of THz wave is measured by using the CO2 pump laser THz source. The measured minimum loss is 0.17 dB/cm and the average loss is about 0.5 dB/cm. The fluctuation of transmission loss is less than 5% after the fiber is bent 90, showing good flexibility to bend. The measured mode field distribution results of the output port show that the optical fiber transmits signals through the main mode, so the THz energy is well bound in the core of optical fiber.
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Key words:
- terahertz /
- photonic crystal fiber /
- cyclic olefin copolymer /
- hollow-core
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