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| However, if we are interested in the maximum in some diffraction order direction, it is much simpler and it seems that this is the preferably used approach - we calculate the far field value only at the diffraction order maximum. Luckily enough, this value is dependent on the aperture only, which constructs the envelope for the diffraction pattern, so in this case one could work only with a single aperture. However, to construct the diffraction pattern is a good way how to debug the problem. | However, if we are interested in the maximum in some diffraction order direction, it is much simpler and it seems that this is the preferably used approach - we calculate the far field value only at the diffraction order maximum. Luckily enough, this value is dependent on the aperture only, which constructs the envelope for the diffraction pattern, so in this case one could work only with a single aperture. However, to construct the diffraction pattern is a good way how to debug the problem. | ||
| - | A comparison of the different evaluation methods is shown below. An important message is that | + | A comparison of the different evaluation methods is shown below. |
| + | It shows a transmission grating that is evaluated different ways. First of all, analytical results for single aperture, for three apertures and nine apertures are shown. | ||
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| + | An important message is that | ||
| using the periodic approach for only a small number of repetitions (p=1 means three slits in this case) 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 (p=1 means three slits in this case) 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). | ||
| - | {{:docs:methods_explanation.png?600|}} | + | {{:docs:methods_explanation_humanized.png?600|}} |
| //Technical remarks: To calculate single aperture correctly it is important to add the side boundaries. It is also crucial to use CPML throughout all the | //Technical remarks: To calculate single aperture correctly it is important to add the side boundaries. It is also crucial to use CPML throughout all the | ||
docs/become.txt · Last modified: 2020/04/24 12:27 by pklapetek
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