Hi, Ardavan,
Thank you very much for your response. The example you showed is the one I mentioned in my question. It uses the Fourier-transformed fields in the postprocessing step. This is different from the "instantaneous" absorption. Can MEEP calculate the absorbed power "during the time iteration" under a pulse excitation? For your reference, I copied the second paragraph of my question below. "I realize that MEEP can calculate the absorbed power density distribution (space-dependent) corresponding to each frequency component of a pulse. This is explained in the tutorial "absorbed power density map of a lossy cylinder." However, the problem I have on hand requires the space-time-dependent absorbed power density since the instantaneous absorption is expected to change the material properties, which will then affect the propagation of electromagnetic fields (i.e., it is nonlinear, and using Fourier transform after the simulation is not correct for this problem). If I could get the instantaneous absorption, I can add the feedback mechanism in the MEEP code." Best, Liang ________________________________ From: Ardavan Oskooi <[email protected]> Sent: Sunday, August 29, 2021 5:01 PM To: Liang Chen; [email protected] Cc: [email protected] Subject: Re: [Meep-discuss] Instantaneous space-time-dependent absorbed power density in a lossy material On 8/29/21 06:25, Liang Chen wrote: Is it possible to calculate the instantaneous absorbed power density distribution in a lossy material in MEEP? For example, for a dispersive material under a pulse excitation, can MEEP calculate the absorbed power density distribution during the time iteration (rather than using the Fourier-transformed fields in the postprocessing step)? Yes, see: https://meep.readthedocs.io/en/latest/Python_Tutorials/Basics/#absorbed-power-density-map-of-a-lossy-cylinder<https://urldefense.com/v3/__https://meep.readthedocs.io/en/latest/Python_Tutorials/Basics/*absorbed-power-density-map-of-a-lossy-cylinder__;Iw!!Nmw4Hv0!gikRH2ZDxSBKoKos3AN-MNHkiavWg8V2UVnanj8nFuqeNMPN--lAKfl_XhuOFZ8eCkGZ$>.
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