Electromagnetic Field Simulator Amplitude Correction
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Solution Overview
Problem
Current electromagnetic field simulators using the FDTD method struggle to accurately simulate the amplitude of electromagnetic waves, particularly in near-field optics, due to reflection issues and incorrect intensity settings, especially when using a 'soft source' wave source.
Innovation Solution
An electromagnetic field simulator that calculates the amplitude of the electromagnetic wave based on space grid width, time step, and electromagnetic physical properties, using a wave source formation section to avoid reflections and accurately reproduce the desired wave amplitude by incorporating a correction formula that accounts for dielectric constant, magnetic permeability, and grid dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a soft source wave source is used to avoid reflections, then reflection issues are reduced, but the amplitude of electromagnetic waves cannot be accurately simulated
Solution Approach 1:
The patent applies parameter changes by introducing a correction coefficient that modifies the wave source amplitude based on grid size and material properties. The correction coefficient changes the amplitude parameter dynamically to compensate for the soft source's inability to maintain accurate amplitude, thereby resolving the contradiction between avoiding reflections and maintaining amplitude accuracy.
Solution Approach 2:
The patent implements feedback by calculating the correction coefficient based on the relationship between grid size, time step, and electromagnetic physical properties. This feedback mechanism continuously adjusts the wave source amplitude to maintain accuracy while preserving the reflection-free characteristic of the soft source.
2Measurement precision
If the space step and time step are set to small values for sufficient calculation accuracy, then simulation precision is improved, but calculation time increases and storage requirements increase
Solution Approach 1:
The patent changes the parameter relationship by establishing a specific correlation between space step, time step, and correction coefficient. This allows for optimized step sizes that balance accuracy requirements with computational efficiency, reducing the need for excessively small steps while maintaining sufficient simulation accuracy.
3Measurement precision
If the main storage device saves instantaneous values of electromagnetic field components for each grid, then simulation detail is improved, but storage capacity limitations restrict model size
Solution Approach 1:
The patent extracts only the essential information needed for amplitude calculation by using the correction coefficient approach. Instead of storing all instantaneous field values, it calculates amplitude corrections based on grid and material parameters, significantly reducing storage requirements while preserving simulation detail.
Data Source
AI summary
The electromagnetic field simulator includes a discrete model setting section which sets a space grid width and a time step in a simulation of the electromagnetic field, a coefficient setting section which sets coefficients of equations for the simulation at various positions in a simulation space based on electromagnetic physical properties, a wave source setting section which sets a position and amplitude of a wave source of the electromagnetic wave as a boundary condition with respect to a spatial distribution of the electromagnetic field, and an amplitude calculation section which calculates amplitude of an electromagnetic field component given to the position of the wave source in the simulation space based on the space grid width and the time step and the electromagnetic physical properties at the position of the wave source to reproduce the electromagnetic wave having the set position and amplitude of the wave source in simulation results.