Open AccessElimination of spurious modes in full-vectorial finite element method based acoustic modal solution
Author(s) -
Aamir Gulistan,
M. M. Rahman,
Souvik Ghosh,
B. M. A. Rahman
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.010900
Subject(s) - spurious relationship , finite element method , modal , optics , acoustics , photonics , physics , computer science , materials science , machine learning , polymer chemistry , thermodynamics
Finite element method is a powerful technique for solving a wide range of engineering problems. However, the existence of the spurious solutions in full-vectorial finite element method has been a major problem for both acoustic and optic modal analyses. For emerging photonic devices exploiting light-sound interactions in high index contrast waveguides, this problem is a major limitation. A penalty function is introduced to remove these unwanted spurious modes in acoustic waveguides, which also identifies the acoustic modes more easily. Numerically simulated results also show considerably improved vector mode profiles. The proposed penalty method has been applied for the characterization of low index contrast single mode fiber and also for high index contrast silicon nanowire to demonstrate its effectiveness.