Hi All,
I am asking how to calculate the absorption power from a laser beam into the semiconductor material. I am using the FDTD solution from Lumerical. According to the user guide, I am confused about which to choose: the divergence of poynting vector and c*E^2(c is some constant) .
I understand the original definition should led to the divergence of poynting vector equal to total dissipation. But I found in Lumerical and many other papers people use the c*E^2to describe the absorption power.
From a lecture note I knew we have also the magnetic dissipation, so I wonder where is the magnetic dissipation, why we left it out?
In metal we have H zero, so no magnetic dissipation is fine. What about dielectric and semiconductor?
Thank you very much for any suggestions.
Letian
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Lemerical user guide:
https://kb.lumerical.com/en/layout_analysis_pabs.html
https://kb.lumerical.com/en/layout_analysis_pabs_simple.html
Poynting vector lecture:
http://slidegur.com/doc/240650/notes-6-6340-poynting-theorem
For most of the optical properties of a material, it is the electrical field of the radiation which is mainly responsible. To investigate magnetic dissipation, you must identify magnetic properties (magnetic susceptibility) of the material with reference to the incident magnetic field intensity of the radiation. Some phenomenon which could possibly manifest due to the magnetic field of the radiation are, Faraday effect, Photomagnetic effect and Magneto-optic Kerr effect. If there is substantial interaction suspected due to magnetic field, I would advise you to employ the the divergence of poynting vector. Moreover, the poynting vector approach is more comprehensive than considering the electric field alone.
Hope it helps!
I also notice the divergence of Poynting vector to calculate the power absorption in Lumerical. But I dont understand why it is equivalent to 0.5 x ω x E^2 x imag (ε).
What dose multiplying ω mean?
Thank you for any suggestions
https://kb.lumerical.com/layout_analysis_pabs_simple.html
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