Unidirectional incident wave for an electromagnetic wave simulation using the finite element method

In many simulations, the interference between the reflection from the structure and incident wave makes obtaining the reflectance difficult. This problem can be solved using unidirectional incident waves. This study developed a novel method to generate a unidirectional source using a simulation. For...

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Bibliographic Details
Published in:Journal of the Korean Physical Society 2021, 78(7), , pp.587-593
Main Authors: Choi, Jihoon, Noh, Heeso
Format: Article
Language:English
Subjects:
Boundary conditions
Electromagnetic radiation
Finite element method
Incident waves
Mathematical and Computational Physics
Optimization
Original Paper
Particle and Nuclear Physics
Physics
Physics and Astronomy
Refractivity
Simulation
Theoretical
물리학
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Summary:In many simulations, the interference between the reflection from the structure and incident wave makes obtaining the reflectance difficult. This problem can be solved using unidirectional incident waves. This study developed a novel method to generate a unidirectional source using a simulation. For the periodic boundary condition, Gaussian source and nanobeam, we obtained an intensity ratio along the backward and the forward directions of the unidirectional incident wave of up to 0.45 % after optimization. The optimized source width for the given wavelength λ was ν λ / ( 2 n eff ) , where ν was a positive integer and n eff the effective refractive index. This study was able to demonstrate that achieving a unidirectional incident wave for the periodic boundary condition, Gaussian source and nanobeam is possible using a simulation. This method can reduce the simulation time and computation memory needed for conventional calculations.
ISSN:0374-4884
1976-8524
DOI:10.1007/s40042-021-00085-3