Journal
INTERNATIONAL JOURNAL OF NUMERICAL ANALYSIS AND MODELING
Volume 18, Issue 4, Pages 524-568Publisher
ISCI-INST SCIENTIFIC COMPUTING & INFORMATION
Keywords
Maxwell's equations; Debye; Lorentz; cold plasma dispersive media; Yee scheme; FDTD method; energy decay; convergence analysis
Categories
Funding
- NSF-DMS grant [1720116]
- Direct For Mathematical & Physical Scien
- Division Of Mathematical Sciences [1720116] Funding Source: National Science Foundation
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This paper develops and analyzes finite difference methods for the 3D Maxwell's equations in three different types of linear dispersive media, and investigates their stability and convergence using energy method. Numerical examples confirm the effectiveness and accuracy of the methods.
In this paper, we develop and analyze finite difference methods for the 3D Maxwell's equations in the time domain in three different types of linear dispersive media described as Debye, Lorentz and cold plasma. These methods are constructed by extending the Yee-Finite Difference Time Domain (FDTD) method to linear dispersive materials. We analyze the stability criterion for the FDTD schemes by using the energy method. Based on energy identities for the continuous models, we derive discrete energy estimates for the FDTD schemes for the three dispersive models. We also prove the convergence of the FDTD schemes with perfect electric conducting boundary conditions, which describes the second order accuracy of the methods in both time and space. The discrete divergence-free conditions of the FDTD schemes are studied. Lastly, numerical examples are given to demonstrate and confirm our results.
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