Yes. > On Nov 4, 2020, at 12:28 PM, Cícero Julião <juliaojun...@gmail.com> wrote: > > Thank you very much! > > Harminv gives tuples holding some information. If I plot "freq" and "decay", > I would have what I want - is It correct? > > Em qua, 4 de nov de 2020 14:16, Steven G. Johnson <stevenj....@gmail.com > <mailto:stevenj....@gmail.com>> escreveu: > Yes, Meep can compute complex (resonant) frequencies; see the manual for > examples (using the "harminv") feature. > > However, you can't have linear gain, leading to a complex frequency in the > upper-half plane, in a time-domain simulation — this corresponds to > exponentially diverging solutions (which will quickly hit floating-point > limits and give ±Inf or even NaN values). Meep does support nonlinear > (saturable) gain, but this will not give the complex-frequency solutions you > want: the nonlinearity will suppress the exponential growth. > > The simplest way to observe these PT-symmetric exceptional-point (EP) > solutions is to start with a PT symmetric system (loss+gain) and then add > loss *everywhere* in the computational cell, so that the gain is cancelled > and you are left with (loss+lossless) materials. (The same trick has been > used in designing experiments IIRC; you should be able to find references on > this if you look.) > >> On Nov 4, 2020, at 9:34 AM, Cícero Julião <juliaojun...@gmail.com >> <mailto:juliaojun...@gmail.com>> wrote: >> >> Dear friends, >> >> I am studying pt-symmetry, gain and loss balanced in a specific way. >> I want to plot the real/imaginary parts of the fields, like in this link: >> https://images.app.goo.gl/zHbezd7MadL3ePDr5 >> <https://images.app.goo.gl/zHbezd7MadL3ePDr5> >> >> Is it possible in Meep? If yes, please could you help me? >> >> >> >> >> -- >> >> Cícero Julião da Silva Junior >> ____________________________________ >> Instituto Federal de Alagoas - IFAL >> Campus Murici >> http://www.ifal.edu.br/ >> <http://www.ifal.edu.br/>_______________________________________________ >> meep-discuss mailing list >> meep-discuss@ab-initio.mit.edu <mailto:meep-discuss@ab-initio.mit.edu> >> http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss >> <http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss>
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