The Mixed Finite-Element Method With Mass Lumping for Computing Optical Waveguide Modes

The Mixed Finite-Element Method With Mass Lumping for Computing Optical Waveguide Modes
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计算光波导模式的质量集总混合有限元法

DOI:
10.1109/jstqe.2015.2473689
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发表时间:
2016-03
影响因子:
4.9
通讯作者:
Liu, Qing Huo
Liu, Qing Huo
中科院分区:
工程技术2区
文献类型:
--
作者:
Cai, Guoxiong;Zhu, Chunhui;Huang, Yueqin;Liu, Qing Huo

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本文提出了一种新的混合有限元法,用于计算各向异性、有耗和开放波导模式。通过将高斯定律引入矢量波动方程,变分公式完全消除了伪模。该方法利用符合卷曲的线性切向和二次法向(LT/QN)边缘元素展开电场的切向分量,并利用改进的标量基函数展开电场的纵向分量。利用质量集中技术,得到了一个小规模的广义特征值问题。数值算例验证了质量集中混合有限元法不存在任何伪本征模,具有较高的计算效率。
A new mixed finite-element method is proposed for computing the anisotropic, lossy, and open waveguide modes. By incorporating Gauss' law into the vectorial wave equation, the variational formulation is completely free of spurious modes. It utilizes the curl-conforming linear tangential and quadratic normal (LT/QN) edge elements to expand the tangential component of the electric field, and the modified nodal-based scalar basis functions to expand the longitudinal component. A smaller scale generalized eigenvalue problem is obtained by employing the mass lumping technique. Numerical examples verify that the mixed finite-element method with mass lumping is free of any spurious eigenmode and has high efficiency.
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