Re: Effective epsilon used for each polarization

On Tue, 10 Oct 2006, Minghui Han wrote:
> in MPB. It really solved my puzzle. I have another quick question here if
> you don't mind. Since MPB uses the same grid for E and H field, how does it
> actually calculate the derivatives? Suppose it wants to know the curl of H
> field at point A, does it just calculate the differences between its
> neighboring points and then divide by 2dr? In addition, is the output tensor

MPB is based on a planewave (Fourier series) expansion.  It doesn't use 
finite differences to compute derivatives, it uses the analytical 
derivative of the Fourier series terms.  Because of this, it has no need 
for a staggered grid to compute E from H or vice versa.

(See also the paper linked to from the MPB web site.)

Steven