Hello Everyone,
I want to test my material by propagating a material down a 1D medium. I want
to change the length of the medium in order to see how the pulse changes as it
travels.
I planned to do this by adjusting this line:
(define-param sz 100) ; size of cell in z direction, 1 = 10 nm
However, if I keep everything the same but adjust sz, I am getting the same
location in time for my pulse. This doesn’t make any sense to me.
Example: if it takes 100 meep seconds to travel 200 units, then I would expect
to see 50 meep seconds for traveling 100 units. However, I am seeing 100 meep
seconds no matter what distance I travel.
I attached a barebones example to demonstrate this. Can anyone see what I am
missing in this simulation?
Also, thank you very much for the previous answers to my questions. It has
helped tremendously.
Priscilla
(define-param sz 10) ; size of cell in z direction, 1 = 10 nm
(define-param fcen .0053619) ; center frequency of source
(define-param df .00055594) ; frequency width of source
(define-param amp 1) ; amplitude of source
(define-param dpml 2) ; PML layer thickness
(set! force-complex-fields? true) ; add complex output to field
(set! geometry-lattice (make lattice (size no-size no-size sz))) ; create 1D
system
(set! pml-layers (list (make pml (thickness dpml)))) ; make the pml for +/- z
boundaries
(set-param! resolution 10) ; dx = 10 nm/#
(set! sources (list
(make source
(src (make gaussian-src (frequency fcen) (fwidth df)))
(component Hy) ; needed for TM
(center 0 0 (+ (* -0.5 sz) dpml)) ; located at - end of
waveguide
(amplitude amp))))
; call to save the field data, we are saving Ex here
(define print-field (lambda()
(print " \n ex:, " (meep-time) ", " (get-field-point Ex (vector3 0 0 (- (*
0.5 sz) dpml))) "\n")))
(run-sources+ 30 (at-every 15 print-field))
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