Photonics

Photonics

Ansys Insight: Incoherent unpolarized dipole

    • Shin-Sung Kim
      Ansys Employee

      To simulate an incoherent unpolarized dipole source we need to perform 3 simulations. In each simulation, there must be one dipole that is orthogonal to the dipoles in the other simulations. The fields from each simulation can be added incoherently.

      In practice, this means that we simulate a dipole oriented along the x, y, and z axes respectively in each simulation. To obtain the unpolarized fields, we can simply sum the results incoherently. This means that the time-averaged electric field intensity of an unpolarized dipole source, or a large number of randomly oriented dipoles in a spatial volume much smaller than the wavelength can be expressed as follows:

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