On Sun, 8 Apr 2007, Ñó Áõ wrote:
At the present we are trying to do some simulations on the interaction between light and active materials (for example, Erbium). In a previous paper Physical Review B 73, 165125 (2006) " Active materials embedded in photonic crystals and coupled to electromagnetic radiation", Peter et al. reported their progress on this subject. I want to ask whether I can use MEEP to perform this task? If so, what are the interfaces through which I can tell MEEP the properties of the active material?
Yes, Meep should be able to do this.Gain is certainly supported; this is just a different sign of the imaginary part of epsilon(omega) when you specify a dispersive material.
Saturable gain (using a 2-level physical model) as described in the PRB paper by Bermel et al. that you cite is also supported, I believe; it was implemented at some point by David Roundy in the code. This is controlled by the "energy-saturation" parameter of the polarizability input class (along with omega, gamma, delta-epsilon, and sigma as defined in the Meep manual). I'm afraid the exact interpretation of this parameter is currently undocumented, however, as I never had a chance to go through that code and figure out how it corresponds to the Bermel paper. So, you have some code reading to do if you want to use that feature.
Steven
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