On Jul 27, 2008, at 7:03 PM, Chao Lu wrote: > I'm trying to simulate an problem with meep, involving silver > nanoparticles, which has an imaginary part in its > epsilon(0.01+i*0.138). As I looked through the tutorials and almost > the mailing list, didn't find any way to have meep solve this. > > But after I checked the latest change log , on 0.20 version, it is > said > ------ > Support for user-specified electric and/or magnetic conductivities. > These are especially useful to add a desired dissipation loss (an > imaginary part of ε/μ) in a narrow bandwidth, without messing > around with Lorentzian dispersive materials. > ------ > does this mean meep cam deal with this kind of metal particles who > have imaginary part in epsilon?
All versions of Meep have been able to handle imaginary parts of epsilon, but they do so via dispersive media. (i.e. you need to specify a frequency dependent imaginary part, like in the physical medium). If you only care about the imaginary part in a narrow bandwidth, it is convenient to set it using the conductivity. This is described in detail by the Meep manual. See: http://ab-initio.mit.edu/wiki/index.php/Materials_in_Meep especially the section on Conductivity, where I've just added an example. Regards, Steven G. Johnson _______________________________________________ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
