The method I refer to lets you define those boundary conditions for rectilinear or cylindrical domains. For a rectilinear domain, imagine your computation domain as a large block, divided up in to smaller yee cells. The faces of the large domain block can be assigned to have metallic, periodic, or magnetic boundary conditions. To uniquely specify the faces of the block, meep assigns each face a direction and a sign. Two opposing faces are High X and Low X, for example. It's just a logical way for assigning labels "+X", "-X", "+Y", "-Y", "+Z", and "-Z" to the six sides of a box. If you want an arbitrary waveguide, however, you need to define the surface of your waveguide through your "eps" definition (see tutorial). To make a metallic waveguide, set eps to be very large and negative (-1e20) for vectors at and larger than your arbitrary surface. Best, Matt On Tue, 12 Feb 2008, Mani chandra wrote: > Hi Matt, > Thank you for replying. I have a few more doubts and I was hoping if you > could help me out. How can one construct an arbitrary shaped waveguide and > set the boundary conditions for it.Note that I want to define my waveguide > *inside *the computational cell, like some bent rectangular shape. And what > does "high" in set_boundary mean? If I have an arbitrary shaped waveguide > then how does the "direction d" come into play? > > Thanking you, > Mani chandra > _______________________________________________ meep-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
