On Aug 22, 2012, at 9:38 AM, Simon Huskier wrote: > Dear all, > > How do we understand the field components, such as Ex, Ey, Ez, Hx, Hy, etc.? > Are they polarization directions? Do they relate to TE, TM waves?
E and H are vector fields. These are their components; I'm not sure I understand your question. In 2d, the field solutions can be decomposed into two noninteracting polarizations (see chapter 3 of jdj.mit.edu/book), TE and TM. We typically use the convention TE = Ex,Ey,Hz and TM=Ez,Hx,Hy, but some authors use the opposite nomenclature. > [width in source class] > There is 'width' property in both continuous-src and gaussian-src. In the > continuous-src, the 'width' is used to turn on the source smoothly only (the > frequency is exactly single frequency assigned by 'frequency' property), > whereas in the gaussian-src, it is used to designate the frequency width. Is > the understanding correct? Yes, more or less. Technically, the continuous source isn't "exactly single frequency" because of the finite turn-on time -- if you Fourier transform it, the finite turn-on time will give some other frequency components --- but after the turn-on the continuous source is described by a sinusoid of the given frequency. --SGJ _______________________________________________ meep-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
