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利用全矢量平面波展开法(FVPWM)对采用改进的两次堆积法制备的空芯光子带隙光纤进行了数值模拟.在特定传播常数β下,光纤在500—1000nm的波段内出现多条宽窄不同的有效光子带隙.依据有效折射率的不同,部分带隙中的空气-导模将以不同的形式存在.经过实验测试,发现测得的带隙位置相对于模拟结果向短波段发生了较明显的移动,主要原因被认为是光纤结构的纵向不均匀性和包层节点处间隙孔的存在.
A full-vector planar wave expansion method (FVPWM) was used to numerically simulate the hollow-core photonic bandgap fiber fabricated by the improved two-time stacking method. Under the specific propagation constant β, there are many different widths in the 500-1000 nm band Of the effective photonic band gap.According to the different effective refractive index, part of the bandgap air-guided mode will exist in different forms.After the experimental test found that the measured bandgap position relative to the simulation results to shortwave occurred more The obvious reason for this shift is mainly the longitudinal inhomogeneity of the fiber structure and the presence of clearance holes at the cladding nodes.