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First, the transmittance and reflectance of each diffraction order are computed using the Electromagnetic Waves, Frequency Domain interface on a single unit cell of the grating. For this part of the model it is necessary to fully resolve the wavelength. A Parametric Sweep is used to compute the transmittance and reflectance as functions of the angle of incidence.
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The second part demonstrates how the transmittance and reflectance values can be used to generate a set of interpolation functions that can be used with the Grating feature of the Geometrical Optics interface.
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In the Select Physics tree, select Optics>Wave Optics>Electromagnetic Waves, Frequency Domain (ewfd).
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Click Add.
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Click Study.
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Click Done.
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Click to expand the Material Properties section. In the Material properties tree, select Electromagnetic Models>Refractive index>Refractive index, real part (n).
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Click to expand the Material Properties section. In the Material properties tree, select Electromagnetic Models>Refractive index>Refractive index, real part (n).
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In the Model Builder window, under Component 1 (comp1) right-click Materials and choose More>Material Link.
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In the Model Builder window, under Component 1 (comp1) click Electromagnetic Waves, Frequency Domain (ewfd).
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Locate the Automatic Diffraction Order Calculation section. Clear the Include in automatic diffraction order calculation check box, as the Diffraction Order nodes need to be manually added for this port for normal incidence.
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Click Add.
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Click Evaluate. The resulting table shows the reflectance and transmittance values as functions of the angle of incidence.
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Find the Functions subsection. In the table, enter the following settings:
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In the Model Builder window, under Component 2 (comp2) right-click Materials and choose More>Material Link.
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Locate the Ray Release and Propagation section. In the Maximum number of secondary rays text field, type 4505.
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In the Model Builder window, under Component 2 (comp2)>Geometrical Optics (gop) click Ray Properties 1.
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In the Model Builder window, under Component 2 (comp2) right-click Definitions and choose Variables.
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In the qy,0 text field, type 1e-6. The ray will be released an extremely short distance above the grating so that even rays at very large angles of incidence will reach the boundary fairly quickly.
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Specify the r vector as
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Locate the Initial Polarization section. From the Initial polarization type list, choose Fully polarized.
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In the az,0 text field, type 1. The released ray is S-polarized. This is consistent with the use of TE waves in the previous study.
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Find the Physics interfaces in study subsection. In the table, clear the Solve check box for Electromagnetic Waves, Frequency Domain (ewfd).
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Find the Studies subsection. In the Select Study tree, select Preset Studies for Selected Physics Interfaces>Ray Tracing.
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In the Settings window for 1D Plot Group, type Transmittance and Reflectance (ewfd and gop) in the Label text field.
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In the associated text field, type Angle of incidence (deg).
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In the associated text field, type Transmittance and Reflectance.
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Click to expand the Coloring and Style section. Find the Line style subsection. From the Line list, choose None.
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Locate the Legends section. In the table, enter the following settings:
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