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March 19, 2023 at 6:20 pm
paopaowenhua
Subscriber在文献 Polarization splitter and rotator with subwavelength grating for enhanced fabrication tolerance(https://doi.org/10.1364/OL.39.006931
)中图2(b)显示了SWG的等效折射率,请问如何用软件计算亚波长光栅中不同模式的等效折射率随宽度的变化曲线?我知道用FDE可以计算直波导的
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March 20, 2023 at 7:50 am
chaow
Subscriber同问
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March 20, 2023 at 11:03 pm
Guilin Sun
Ansys Employee遗憾,我们无法浏览该文献。
你有看到文献是怎么计算的吗?
一般可以从能带结构里计算,请找一下相关参考文献。因为有K值(你需要将能带结构的点数换为K,即波数),又知道能带上给定频率的真空K0,就可以根据定义计算等效折射率。
也可以把两个不同波导截面的模式折射率做几何平均简单计算,前提是两个截面均支持模式。如果其中一个不支持模式显然无法用此方法计算。
此时有人用基底折射率与波导芯材料折射率做几何平均。
还有人建议将两个波导做平均计算这个等效波导的模式折射率。
你还可以用布拉格反射波长反推等效折射率。布拉格波长=2*周期*neff,当然需要你确认在指定频率上产生布拉格反射。
你需要琢磨一下,看看文献,再决定用什么方法。
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