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app:rough_surface [2018/01/30 16:31] pklapetek |
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| ===== Rough surface scattering ===== | ===== Rough surface scattering ===== | ||
| - | n this example we will use GSvit to simulate scattering from a highly absorbing sample (e.g. metallic). Calculation procedure is very similar to reflection grating example, we again use a height field to setup measurement volume material parameters, however here we do not apply periodic boundary conditions as the surface is not periodic (and we do not want to introduce artificial periodicity to the results). | + | In this example we will use GSvit to simulate scattering from a highly absorbing sample (e.g. metallic). Calculation procedure is very similar to reflection grating example, we again use a height field to setup measurement volume material parameters, however here we do not apply periodic boundary conditions as the surface is not periodic (and we do not want to introduce artificial periodicity to the results). |
| - | {{:app:c_rough_surface.png?200|}} | + | {{:app:c_rough_surface.png?200 |}} |
| In the left figure a topography of randomly rough surface similar to one used in solar cell manufacturing is displayed. Surface is formed by randomly placed facets of size similar to visible wavelength, so we cannot use geometric optics approach for scattering calculation. Facets are having the same angle with respect to surface normal, typically given by etching process, however using some special technologies the angle can be varied in wider range. If angular distribution of scattered light from an interface is calculated, it can be used by some more complex models of solar cell performance or its optimisation. FDTD is one possible solution for such calculation, however other numerical electromagnetics methods can be applied as well. Note that we have generated a synthetic surface in this example, very similar to real surface, in order to have possibility to compare the resulting scattering maxima to an "ideal" value. | In the left figure a topography of randomly rough surface similar to one used in solar cell manufacturing is displayed. Surface is formed by randomly placed facets of size similar to visible wavelength, so we cannot use geometric optics approach for scattering calculation. Facets are having the same angle with respect to surface normal, typically given by etching process, however using some special technologies the angle can be varied in wider range. If angular distribution of scattered light from an interface is calculated, it can be used by some more complex models of solar cell performance or its optimisation. FDTD is one possible solution for such calculation, however other numerical electromagnetics methods can be applied as well. Note that we have generated a synthetic surface in this example, very similar to real surface, in order to have possibility to compare the resulting scattering maxima to an "ideal" value. | ||
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| Technically, we have used again a simple Gwyddion module for data preparation and postprocessing. All this can be however done also manually or using another simple script in you favourite programming language. | Technically, we have used again a simple Gwyddion module for data preparation and postprocessing. All this can be however done also manually or using another simple script in you favourite programming language. | ||
app/rough_surface.txt ยท Last modified: 2018/01/30 16:33 by pklapetek
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