Hello, I also have concern about Meep's support of anisotropic dispersive materials. Does this mean that I can specify Lorentzian/Drude susceptibility as tensor?
According to Meep reference, It seems meep doesn't support it yet. Best Regard Liu On Sun, Sep 2, 2012 at 4:47 AM, Steven G. Johnson <stevenj....@gmail.com>wrote: > > On Aug 29, 2012, at 10:58 PM, Roman Zubov wrote: > > in the release notes you write that now Meep supports anisotropic > dispersive materials. The Meep reference says that the sigma-conductivity > tensor must be symmetric. But as I know its not the case for magnetised > plasmas. For example in the cold collisionless plasma at a fixed frequency > the susceptibility matrix is Hermitian. Which implies that the Meep > sigma-conductivity matrix must be anti-symmetric (proportional to the > imaginary part of the susceptibility matrix). So it seems to be impossible > to model such a medium in a narrow bandwidth as you suggest. > > Meep currently only supports reciprocal media, corresponding to symmetric > tensors. You are talking about non-reciprocal/gyromagnetic media, which > are not supported. > > (Also, the conductivity tensor may only be diagonal. However, the > Lorentzian sigma tensor may have symmetric off-diagonal components.) > > > > Am I get it right, it is still not possible to model an arbitrary medium > in Meep in this release? > > There are various materials that Meep still does not support. > Non-reciprocal (gyromagnetic) media. Bi-anisotropic (chiral) media. > Nonlocal media (materials in which an electric field at one point creates > a polarization somewhere else, e.g. metals at small scales where you take > ballistic charge transport into account). Various kinds of nonlinearities > (anisotropic Kerr media, off-diagonal anisotropic second-order > nonlinearities, saturable gain, ....). And one can come up with more > examples... Truly "arbitrary" media is a tall order for any code, I'm > afraid. > > --SGJ > _______________________________________________ > meep-discuss mailing list > meep-discuss@ab-initio.mit.edu > http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss >
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