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docs:become [2020/04/22 23:01] pklapetek |
docs:become [2020/04/22 23:04] pklapetek |
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| ===== 2D calculation ===== | ===== 2D calculation ===== | ||
| - | Calculations in 2D are performed using the GSvit2D solver which is an almost unused extension of GSvit to 2D calculations. As this was very outdated, most of the algorithms had to be implemented, incuding near-to-far field calculation and various materials treatment including dispersive metal treatment via PLRC algorithm. | + | Calculations in 2D are performed using the GSvit2D solver which is an almost unused extension of GSvit to 2D calculations. As this was very outdated, most of the algorithms had to be implemented, including near-to-far field calculation and various materials treatment including dispersive metal treatment via PLRC algorithm. |
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| //periodic NFFF// in the next text. | //periodic NFFF// in the next text. | ||
| In most of the graphs here we show complete diffraction pattern. | In most of the graphs here we show complete diffraction pattern. | ||
| - | 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. The schematics of | + | 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 calculate the whole diffraction pattern is a good way how to debug the problem. The schematics of |
| the calculations is here: | the calculations is here: | ||
| Line 35: | Line 35: | ||
| 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. For large number of periodic approach repetitions we get results that are same as analytical results. | + | using the periodic approach with 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 repetitions we get results that are same as analytical results. |
| If we manually extend the computational domain and include all the apertures, results agree with the analytical results also for small number of apertures. See the technical explanation listed below for our reference. | If we manually extend the computational domain and include all the apertures, results agree with the analytical results also for small number of apertures. See the technical explanation listed below for our reference. | ||
docs/become.txt ยท Last modified: 2020/04/24 12:27 by pklapetek
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