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docs:become [2020/04/19 15:42] pklapetek |
docs:become [2020/04/22 14:26] pklapetek |
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| An important message is that | An important message is that | ||
| - | using the periodic approach for only a small number of repetitions does not work as it does not take into account the field on sides of the computational domain (see the technical explanation listed below for our reference). | + | using the periodic approach for only a small number of repetitions does not work as it does not take into account the field on sides of the computational domain. For large number of periodic approach repetitions we get results that are same as results from manually extending the computational domain and adding all the apertures to it. See the technical explanation listed below for our reference. |
| {{:docs:methods_explanation_humanized.png?600|}} | {{:docs:methods_explanation_humanized.png?600|}} | ||
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| * effect of absorbing boundary type smaller or distance to the boundary much smaller (mostly invisible, below percent?). The transmission around zero order is larger slightly when Liao condition is used instead of CPML. | * effect of absorbing boundary type smaller or distance to the boundary much smaller (mostly invisible, below percent?). The transmission around zero order is larger slightly when Liao condition is used instead of CPML. | ||
| * effect of NFFF box size is up to 6 percent for the maximum difference of intensities at the first diffraction order (NFFF box sizes from 100x20 to 340x130, when y size is evaluated from the aperture plane and even for maximum NFFF the boundary in x is about 200 voxels far). Smaller NFFF box seems to be better; when it is enlarged artefacts can be seen. There is always a difference between analytical model that does not go to zero for maximum angles, and numerical model that goes to almost zero. | * effect of NFFF box size is up to 6 percent for the maximum difference of intensities at the first diffraction order (NFFF box sizes from 100x20 to 340x130, when y size is evaluated from the aperture plane and even for maximum NFFF the boundary in x is about 200 voxels far). Smaller NFFF box seems to be better; when it is enlarged artefacts can be seen. There is always a difference between analytical model that does not go to zero for maximum angles, and numerical model that goes to almost zero. | ||
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| + | The transition from transition geometry to reflection geometry was done first with perfect electric conductor as a grating material. Here, the validation of the periodic calculation via manual | ||
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docs/become.txt ยท Last modified: 2020/04/24 12:27 by pklapetek
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