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Electric field distribution - Point Source

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I want to simulate the Vertical and Horizontal polarization of dipole source.

Its Au-GaAs-Air structure with electric dipole source. You can find that in attachment. For this we need to import n and k values for both GaAs and Gold right ? I did it and imported via interpolation. Since I m dealing in Lambda I made arguments in nm. The data source file for GaAs and Au can be found in mph file. I got that from refractive index.info site. I think for each wavelength, the values are not listed.So this would be fine for simulation?? And I had defined the relative permittivity in GaAs and Au. Is thats right ?? Can we use Scat B.C or PML for this ?

For Vertical and Horizontal Polarization, I chose Dipole : Magnitude and direction - x = 0 and y=1 for V-Pol and vice versa for H-Pol right ? Correct me if I m wrong.

Thank you.

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