yes, only TM polarization can excite SPP, but for two infinite layer, I thank (Hz and ky) , (Hy and and kz) are both TM polarization. can you explain the different between this two condition.
On Tue, Dec 11, 2012 at 12:39 AM, Judson Ryckman < [email protected]> wrote: > You should only be able to activate the SPP for TM polarization.. > Which appears to indeed be what you are observing! --Judson > > On Mon, Dec 10, 2012 at 9:35 AM, huang bo <[email protected]> wrote: > > hi everyone! > > below is the .ctl file I use to calculate the dispersion relation of > surface > > plasmon > > I can get the dispersion relation when the source component set as Hz and > > ky run from kmin to kmax. > > the queer problem is that > > when I set the source component as Hy, and kz run from kmin to kmax, I > can > > not get the dispersion relation. > > Anyway,both configurations are the same for two infinite metal and air > > layer. > > > > anyone have any idea about that? > > thank! > > > > > > (define-param sx 4) > > (set! geometry-lattice (make lattice (size sx no-size no-size))) > > (set-param! resolution 40) > > ;(set! eps-averaging? false) > > (define omega_eps 0.3) > > (define Ag51 (make dielectric (epsilon 6.8) > > (polarizations > > (make polarizability > > (omega 1e-20) (gamma 0.003226) (sigma (* 6.8 omega_eps omega_eps > 1e+40))) > > ))) > > (set! geometry (list > > (make block (center 0 0 0) (size sx infinity infinity) > > (material Ag51)) > > (make block (center 1 0 0) (size 2 infinity infinity) > > (material air)) > > )) > > (define-param fcen 0.2) ; pulse center frequency > > (define-param df 0.4) ; pulse width (in frequency) > > (define-param runtime 200) > > (set! sources (list > > (make source > > (src (make gaussian-src (frequency fcen) (fwidth df))) > > (component Hz) > > (center 0.0 0 0)) > > )) > > ;(use-output-directory) > > (define-param kmin 0.0) > > (define-param kmax 3.0) > > (define-param k-interp 10) > > (define kpts (interpolate k-interp (list (vector3 0 kmin 0) (vector3 0 > > kmax 0 )))) > > (define all-freqs (run-k-points runtime kpts)) ; a list of lists of > > frequencies > > _______________________________________________ > > meep-discuss mailing list > > [email protected] > > http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss >
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