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fdtd:sources [2018/01/29 16:06] pklapetek |
fdtd:sources [2018/01/29 16:40] pklapetek |
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- | To perform a computation we need to setup at least single source of electromagnetic field. The simplest source is a point one, which is physically similar to a small dipole. More rigorous is an electric or magnetic current source which has exactly the same funcionality as the electric or magnetic dipole. | + | To perform a computation we need to setup at least single source of electromagnetic field. The simplest source is a point one, which is physically similar to a small dipole. More rigorous is an electric or magnetic current source which has exactly the same functionality as the electric or magnetic dipole. |
- | + | ||
- | If we need a plane wave to interact with our computation volume, we are no more able to use a set of point sources (unless we have extremely large computational volume which is unrealistic. Special techniques need to be used, for example one known as total/scattered field or scattered field. Both approaches are based on addition and eventually subtraction of precomputed plane wave to/from some points in the computational volume. | + | |
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{{ :samples:img_source_point.png?100|}} | {{ :samples:img_source_point.png?100|}} | ||
Sample parameter file: {{samples:source_point.tar.gz|point source}}. | Sample parameter file: {{samples:source_point.tar.gz|point source}}. | ||
+ | \\ | ||
A 200x200x200 computational domain with single point source and a metallic sphere made of a perfect electric conductor. | A 200x200x200 computational domain with single point source and a metallic sphere made of a perfect electric conductor. | ||
// | // | ||
---- | ---- | ||
+ | |||
+ | If we need a plane wave to interact with our computation volume, we are no more able to use a set of point sources (unless we have extremely large computational volume which is unrealistic. Special techniques need to be used, for example one known as total/scattered field or scattered field. Both approaches are based on addition and eventually subtraction of precomputed plane wave to/from some points in the computational volume. | ||
+ | |||
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{{ :samples:img_source_tsf.png?100|}} | {{ :samples:img_source_tsf.png?100|}} | ||
Sample parameter file: {{samples:source_tsf.tar.gz|total/scattered field source}}. | Sample parameter file: {{samples:source_tsf.tar.gz|total/scattered field source}}. | ||
+ | \\ | ||
A 200x200x200 computational domain with total/scattered field source and a metallic sphere made of a perfect electric conductor. | A 200x200x200 computational domain with total/scattered field source and a metallic sphere made of a perfect electric conductor. | ||
// | // | ||
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{{ :samples:img_source_sf.png?100|}} | {{ :samples:img_source_sf.png?100|}} | ||
Sample parameter file: {{samples:source_sf.tar.gz|scattered field source}}. | Sample parameter file: {{samples:source_sf.tar.gz|scattered field source}}. | ||
+ | \\ | ||
A 200x200x200 computational domain with scattered field source and a metallic sphere made of a perfect electric conductor. | A 200x200x200 computational domain with scattered field source and a metallic sphere made of a perfect electric conductor. | ||
// | // | ||
---- | ---- | ||
+ | |||
+ | To get focused source we can use plane waves summation method. | ||
+ | |||
+ | ---- | ||
+ | // | ||
+ | {{ :samples:img_source_tsff.png?100|}} | ||
+ | Sample parameter file: {{samples:source_tsff.tar.gz|total/scattered focused field source}}. | ||
+ | \\ | ||
+ | A 200x200x200 computational domain with focused source and a metallic sphere made of a perfect electric conductor. | ||
+ | // | ||
+ | ---- | ||
+ | |||
+ | Layered source | ||
+ | |||
+ | ---- | ||
+ | // | ||
+ | {{ :samples:img_source_ltsf.png?100|}} | ||
+ | Sample parameter file: {{samples:source_ltsf.tar.gz|layers compatible field source}}. | ||
+ | \\ | ||
+ | A 200x200x200 computational domain with source compatible with infinitely extending layers. | ||
+ | // | ||
+ | ---- | ||
+ | |||