This appears exactly as the result of the said effect. The good point is that the gaussian source shape is reasonably preserved upon differentiation, so you may pre-compensate it by "fcen=0.40". Or, if you have tighter requirements on the source, you may use the newly implemented feature of band-source (), which guarantees flat spectrum and suppressed spectral leakage. Its advantages are a tradeoff with a much longer source duration. You would also have to compile the fresh version of MEEP from github. Filip
2014-04-22 16:17 GMT+02:00, Ehsan Saei <e.s...@hotmail.com>: > I've just used fcen=0.45 for source but the power has a frequency center at > 0.5. Is there any solution for this behavior? > >> Date: Tue, 22 Apr 2014 16:08:12 +0200 >> Subject: Re: [Meep-discuss] why the energy spectrum radiated by a point >> source doesn't match with the spectrum of source itself? >> From: filip.domi...@gmail.com >> To: e.s...@hotmail.com; meep-discuss@ab-initio.mit.edu >> >> May it be attributed to that the radiated field is a derivative of the >> current, so that high-frequency components are enhanced compared to >> the lower frequency ones? Or is it a more complicated deviation? >> Regards, >> Filip >> >> 2014-04-22 16:01 GMT+02:00, Ehsan Saei <e.s...@hotmail.com>: >> > Dear Steven and MEEP users, >> > >> > I simulated a point source which is located in free-space (air ) and >> > tried >> > to compute the power radiated by the source and travels through a cubic >> > that >> > surrounds the source. After plotting the data I have noticed that the >> > power >> > has a frequency center different from that I have used for the source. >> > Any idea about this behavior? >> > >> > Thanks in advance, >> > Ehsan >> > > _______________________________________________ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
