On Tue, 27 Feb 2007, Nils Jensen wrote:
1. I use the Gaussian dipole source (Ey). This efficiency is obtained by the ratio of the z component of the Poynting vector integrated over a rectangular parallelepiped to the normal component integrated over the same surface. In this case, What can I define the height, the width and the length of the parallelepiped?
Not quite, if I remember correctly. The extraction efficiency, as defined in that paper, is the ratio of the upward flux to the total radiated power.
The upward flux is computed just by putting a flux plane above the slab. The total radiated power is computed by putting a box of flux planes around the slab.
Note also that the extraction efficiency as defined in that paper is not the only useful quantity to compute in this context, or even necessarily the most useful quantity. Another important figure of merit is the total radiated power compared to the total radiated power in a homogeneous medium, which measures how much your structure enhances (or suppresses) spontaneous emission rates. In general, you should never blindly compute some figure of merit without understanding what it means and measurs.
2. In MEEP, What can I define to calculate the normal components? (the total emitted flux)
Whenever you give Meep a flux plane, by default it computes the flux in the direction normal to the plane.
3. I want to obsever the extraction efficiency over the large of frequency (fcen: 0.5, and the width 1.0). What can I do in this case?
You can tell Meep to compute the flux spectrum over whatever frequency range you want.
Steven _______________________________________________ meep-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
