I found myself the answer to the question I raised on the time-average of dpwr
and prof. Steven Johnson's comment.
I thought the plane wave that I made with a single frequency E field oscillates
between -1 and +1.
But when I looked at it closely, it oscillated between -1/2 and 1/2. So the
time average of E*D/2 in vacuum
must be 1/16 or 0.0625. My dpwr output shows that it is close to 0.0625 in the
vacuum area, so it is consistent.
If anyone is interested in getting field enhancement fact of E for a certain
target geometry, remember to normalize dpwr outputs accordingly.
On Feb 11, 2008, at 1:19 PM, Seong Kyu Kim wrote:
> (1) dwpr is supposed to write E*D/2 or epsilonE*E, whose time
> average under vacuum should give 1/4. However, the time averaged
> dwpr gives almost zero in vacuum area? (I get the same result if I
> accumulated many h5 files and averaged them individually.) Isn't
> this strange?
>
Why do you think this is strange? It's obviously a positive quantity;
the absolute magnitude will depend on your source etc.
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