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--- fdtd:sources [2018/01/29 16:23]
pklapetek
+++ fdtd:sources [2018/01/29 16:40]
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 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.
 In total/scattered field (TSF) technique we draw a boundary around the area where we need the plane wave and we add the plane wave on one side and subtract it on other side (depending on wave traveling direction). There can be anything inside TSF volume as there are no special algorithms run there.
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 //
 ----
+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.
+//
+----

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