Hi Givonda! Please note that Meep does not support complex frequency-independent epsilon, as written here :
http://ab-initio.mit.edu/wiki/index.php/Meep_Reference I quote : "Complex ε and μ: you cannot specify a frequency-independent complex ε or μ in Meep (where the imaginary part is a frequency-independent loss), but there is an alternative. That is because there are only two important physical situations. First, if you only care about the loss in a narrow bandwidth around some frequency, you can set the loss at that frequency via the conductivity (see Conductivity in Meep). Second, if you care about a broad bandwidth, then all physical materials have a frequency-dependent imaginary (and real) ε (and/or μ), and you need to specify that frequency dependence by fitting to Lorentzian resonances via the polarizability below." So Python-Meep doesn't support it either, simply because the Meep core doesn't. Using the conductivity work-around should be possible with Python-Meep but the polygon approach has not yet been implemented for callback of conductivity. This should be rather straightforward to do, but would still require some work. If you're interested, I can give you information on how to do it: we could set up a Skype chat for example. It would be a valuable addition to Python-Meep. with kind regards, Emmanuel ----------------------------------------------------- Hi, I've been trying to write some code to simulate metalic nano structures with python-meep. However, I could find no clue how use a complex permittivity in the material stack. If I use a complex array as a parameter for add_material_stacks_from_numpy_matrix() I get the following error. Traceback (most recent call last): File "<pyshell#33>", line 1, in <module> mat=epsilon() File "<pyshell#32>", line 16, in __init__ self.add_material_stacks_from_numpy_matrix(ms, 2) File "/usr/local/lib/python2.6/dist-packages/meep.py", line 4337, in add_material_stacks_from_numpy_matrix return _meep.PolygonCallback3D_add_material_stacks_from_numpy_matrix(self, *args) TypeError: array cannot be safely cast to required type I have tried using the NUMPY matrix metod too with the same result. I am not sure how to proceed from here or where to look. Best regards, Govinda _______________________________________________ Mailing list: https://launchpad.net/~python-meep Post to : [email protected] Unsubscribe : https://launchpad.net/~python-meep More help : https://help.launchpad.net/ListHelp
