On Sun, 5 Nov 2006, Zhichao Ruan wrote:
Many thanks for your help. I understand how to setup a Hx source
oriented on the z=0 to excite the even Hx field about z.
Now i have another question, can i use the Hx source, which is not
oriented on z=0 but with the (phase 1), to excite the odd Hx field about
z. I fail to do in this way (please see the following ctl file). Could
you give me some instruction?
[...]
(set! sources (list
(make source
(src (make gaussian-src (frequency fcen) (fwidth df)))
(component Hx) (center 0 0 (/ 25 16)))
))
(set! symmetries (list (make mirror-sym (direction Z) (phase 1))))
You specify a z=0 mirror symmetry plane, but then you are adding an Hx
source at z != 0 which breaks this mirror symmetry. The results are
undefined.
In general, you have to realize that the symmetry must be obeyed by *both*
the structure *and* the sources in order to exploit symmetry.
Now, if you wanted to have a even z=0 mirror plane with an Hx source at z
!= 0, what you could do is to add an Hx source with amplitude +1 at z =
+25/16, and add another Hx source with amplitude -1 at z = -25/16. This
has even symmetry.
Steven
PS. Zhichao, you need to send messages to [email protected],
not [EMAIL PROTECTED]
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