Dear Meep users ! Research team at nanolab.phys.msu.ru (Moscow State University, Physics department) uses Meep for different simulations. As a side-effect of researches, we created python interface for libmeep (current version - 0.20-3, also available for legacy 0.10-2) using SWIG. Currently, it is in the alpha state and not recommended for actual simulations, presented for testing and as a proof-of-concept. Hopefully, in the case of public interest in pythonic interface for libmeep, we will continue our efforts and offer Meep community a simpler way for simulations, that do not require C++ or Scheme experience. The license is the same as for Meep itself, so it is GPL.
Unfortunately, even fresh Ubuntu release (8.10) and soon to be released Debian Lenny contain the legacy 0.10 version of Meep. Packages with current version 0.20-3 were backported for Ubuntu 8.10 and are also available at our site. Most probably, they can also be installed in Debian Lenny and Ubuntu 8.04. At least, backporting of Meep-0.20-3 for them is not difficult and may be performed on demand. To use this packages, add following line to your /etc/apt/sources.list: deb http://nanolab.phys.msu.ru/files/python-meep/intrepid-debs ./ then use 'apt-get update' and 'apt-get install meep' (or 'apt-get install libmeep2' for library only). MPI-version is also available (untested!). Python interface is in http://nanolab.phys.msu.ru/files/python-meep/python-meep.tar.gz. This file also contains two simple tests, analogical to first two tests in Meep tutorial (simple waveguide and bent waveguide, http://ab-initio.mit.edu/wiki/index.php/Meep_Tutorial). Obtained simulation results are similar to these mentioned tutorials, but resulting png's are somewhat distorted (compared to those on Meep web-site). Untar it, and look at test scripts for reference. C++ classes, methods, constants names, etc are mostly preserved. Following is the simplest waveguide simulation with comments (using "from meep import *" much shorter and cleaner script can be obtained, but AFAIK it is not generally recommended) : #!/usr/bin/env python import meep class epsilon(meep.Callback): def __init__(self,inner_eps=1.0,outer_eps=1.0): meep.Callback.__init__(self) self.inner_eps=inner_eps self.outer_eps=outer_eps def test(self): print 'test message' print 'our material class can have own functions and variables !' def eps(self,vec): # this is our material distribution - for any Y in range 3.5-4.5 => width=1 , indefinitely long along the X if abs(vec.y()-4)<=0.5: return self.inner_eps else: return self.outer_eps # create a volume, x=16 cells, y=8 cells, resolution = 10 vl=meep.vol2d(16,8,10) #origin is in the corner, but we can change it by calling vl.shift_origin #set our material function as callable from libmeep eps=epsilon(12) meep.setCallback(eps.__disown__()) # create a perfect matching layer, 1 cell deep pml=meep.pml(1.0) # meep.EPS is our pointer to our callback material function # this hack allows only 1 callback function at any given time st=meep.structure(vl,meep.EPS,pml) # initialize simulation, populate initial values fl=meep.fields(st) # create a point source, take care about pml ! sr=meep.continuous_src_time(0.15) r_pos=meep.vec(1.0,4.0) fl.add_point_source(meep.Ey,sr,r_pos) # of course, we could also write fl.add_point_source(meep.Ey, meep.continuous_src_time(0.15), meep.vec(1.0,4.0) ) # let's see what we have fl.output_hdf5(meep.Dielectric,vl.interior()) #let the simulation start while fl.t<=1000: fl.step() # what is the magnetic field distribution at the end? fl.output_hdf5(meep.Hz,vl.surroundings()) # get_field can be used to determine value of specified fields at any point print fl.get_field(meep.Hz,meep.vec(2,4.2)) I should note, that MPI is not tested and fl.get_eps() breaks for unknown reason. Of course, there could be other unnoticed bugs and shortcomings. Please, do not hesitate to contact me for questions and suggestions. With technical questions about nanolab.phys.msu.ru contact Boris Tsema (tsema at nanolab.phys.msu.ru). This work was at least partially supported by Russian Foundation for Basic Research, grant #08-02-90902mob_sng_st. With best regards, Nizamov Shawkat _______________________________________________ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
