On Thu, 22 Feb 2007, Chad Huskow wrote:
In 2D-PCs: The source will now be the usual Gaussian pulse centered at
fcen, located at one edge of the cell just outside the PML, at x = dpml
- 0.5*sx. Ideally, we would excite exactly the fundamental mode of the
waveguide, but it is good enough to just excite it with a line source.
Moreover, since we are interested in the TE polarization (electric field
in the plane), we will excite it with a Jy current source (transverse to
the propagation direction), which is specified as Ey:
[...]
In PC slabs:What do I define the source? Could you help me?
In PC slabs you will most likely define the source in exactly the same
way, except that your source lies in the z=0 plane (the midplane of the
slab) or, more likely, is a region centered at z=0 with a thickness
similar to the slab thickness.
If the slab has z=0 mirror symmetry, there are even/odd symmetry modes
analogous to the TE/TM in 2d, and which are excited by the same types of
sources. Even if it doesn't have z=0 mirror symmetry (e.g. if it sits on
a substrate), the modes divide into approximately even/odd types which are
still mostly excited by the same types of sources.
Ultimately, however, what type of source you want depends on what kind of
mode(s) you want to excite.
Steven
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