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open source FDTD solver with GPU support

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fdtd:sources [2018/01/29 16:40]
pklapetek
fdtd:sources [2018/08/28 15:18] (current)
pklapetek [Sources]
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-To get focused source we can use plane waves summation method.+To get focused source we can use plane waves summation method ​as published in Ref. [1]. This is based on decomposition of the ideal focused beam onto a set of plane wave with appropriate angles and phases.
  
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-Layered source+Layered source ​is a special source conditions suitable for materials with infinitely extending layers (e.g. thin films) as published in Ref. [2]. In our implementation the layers have to be laterally oriented in xy direction, so they have normal in z direction. The material can be formed by N layers in z-direction (in present implementation only dielectric and non-absorbing). Incident wave however can cross the sample at angle as well.  
 + 
 +{{ :​samples:​ltsf.png?​600 |}}
  
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 // //
 ---- ----
 +
 +
 +Layered focused source is a mixture of focused source plane wave summation and use of infinite layers in z direction, i.e. the above two sources.
 +
 +----
 +//
 +{{ :​samples:​img_source_ltsff.png?​100|}}
 +Sample parameter file: {{samples:​source_ltsff.tar.gz|layers compatible focused field source}}.
 +\\
 +A 200x200x200 computational domain with focused source compatible with infinitely extending layers.
 +//
 +----
 +
 +Finally, some of the sources can be also altered after they are set, e.g. to change the source profile.
 +This is the case of LTSF and TSF (in z direction) where we can multiply the plane wave entering the computational domain by a Gaussian to get a slightly diverging Gaussian beam.
 +
 +----
 +//
 +{{ :​samples:​img_source_gaussian.png?​100|}}
 +Sample parameter file: {{samples:​source_gaussian.tar.gz|TSF Gaussian source}}.
 +\\
 +A 250x180x200 computational domain with total/​scattered field source, incidient at angle and multiplied by a Gaussian function.
 +//
 +----
 +
 +
 +==== Reference ====
 +
 +[1] I.R.Capoglu,​ A. Taflowe, V. Backman, Optics Express 23 (2008) 19208.
 +
 +[2] I.R. Capoglu, G.S. Smith: IEEE Transactions on Antennas and Propagation 02/2008, 56:1.
  
  
  
fdtd/sources.1517240454.txt.gz · Last modified: 2018/01/29 16:40 by pklapetek