Hello, I would like to probe a material with a pulse whose frequency has an epsilon = -.3 + .002i. I have tested the system with an epsilon of 1 and everything works as expected.
I changed epsilon like so: (define-param r -.3) (define-param i .002) (set! default-material (make medium (epsilon r) (D-conductivity (/ (* 2 pi fcen i) r)))) where fcen is the frequency of the incoming pulse. However, when I look at the output field I am getting +nan.0+nan.0is for every time step. I just saw in a post from 2014 (https://www.mail-archive.com/meep-discuss@ab-initio.mit.edu/msg05168.html) that the real part of permittivity may never be negative. Has this been fixed? Is this a failure in how I set up the problem, or is the meep code not capable of handling negative permittivity values? Thank you, Priscilla _______________________________________________ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
