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| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
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docs:become [2020/04/22 21:44] pklapetek |
docs:become [2020/04/22 22:18] pklapetek |
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| The image below shows the normalized angular dependence of the diffraction from the (finite size) grating. | The image below shows the normalized angular dependence of the diffraction from the (finite size) grating. | ||
| - | {{:docs:result_twomethods.png?600|}} | + | {{:docs:result_twomethods.png?800|}} |
| When inspected in detail, it can be seen that there is a difference of about 3 percents between | When inspected in detail, it can be seen that there is a difference of about 3 percents between | ||
| - | the two methods output for the first diffraction maximum, similarly to the PEC case. However, | + | the two methods output for the first diffraction maximum, similarly to the PEC case. |
| - | the diffracted intensity is about 0.147 of the incident intensity, which is less than | + | Again we expect that this difference is given by the difference in models - big single calculation |
| - | expected (0.178). Something has to be wrong. | + | has to work with limited source size and repeated calculations work with infinitely periodic field |
| + | even if they are not infinitely periodic. | ||
| + | A bigger problem is that the diffracted intensity is about 0.147 of the incident intensity, | ||
| + | which is less than expected (the expected value is 0.178). Something has to be wrong. | ||
| The first suspect is the refractive index. | The first suspect is the refractive index. | ||
| Line 105: | Line 108: | ||
| To compare its impact on results, here is a list of different metal model settings and results: | To compare its impact on results, here is a list of different metal model settings and results: | ||
| - | * the fitted metal setting: 6 1.03583 0 1.37537e+16 1.25733e+14 2.1735 -0.504659 7.60514e+15 4.28131e+15 0.554478 -1.48944 6.13809e+15 6.62262e+14 means n=(0.129 + 3.87i) and leads to first order diffraction of 0.147 | + | * the fitted metal setting: 6 1.03583 0 1.37537e+16 1.25733e+14 2.1735 -0.504659 7.60514e+15 4.28131e+15 0.554478 -1.48944 6.13809e+15 6.62262e+14 means n=(0.129 + 3.87i) and leads to first order diffraction intensity of 0.147 |
| - | * default metal setting: 6 0.89583 0 13.8737e15 0.0207332e15 1.3735 -0.504659 7.59914e15 4.28431e15 0.304478 -1.48944 6.15009e15 0.659262e15 means n=(0.036 + 4.147i) and leads to first order diffraction of XXX (i.e. better than now). | + | * default metal setting: 6 0.89583 0 13.8737e15 0.0207332e15 1.3735 -0.504659 7.59914e15 4.28431e15 0.304478 -1.48944 6.15009e15 0.659262e15 means n=(0.036 + 4.147i) and leads to first order diffraction intensity of 0.150. |
| + | |||
| + | Error in the reference value (PEC reflection) is below 0.001 percent. | ||
| Another suspect is the voxel spacing. However, at least for 5 nm and 10 nm voxel spacing the resulting diffraction maximum was nearly same (less than 0.5 percent difference). | Another suspect is the voxel spacing. However, at least for 5 nm and 10 nm voxel spacing the resulting diffraction maximum was nearly same (less than 0.5 percent difference). | ||
docs/become.txt · Last modified: 2020/04/24 12:27 by pklapetek
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