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(define-param eps (* 3.45 3.45)) (define-param a 1) (define-param r1 (/ 120 420)) (define-param Ny 31) (define-param Nx 21) (define-param pad 2) ; padding between last hole and PML edge (define-param dpml 1) ; PML thickness ; The cell dimensions (define-param sx (+ Nx (* 2 (+ pad dpml)))) ; size of cell in X direction (define-param sy (+ Ny (* 2 (+ pad dpml)))); size of cell in Y direction ; define a couple of parameters to determine the frequency range (define-param fcen 0.5) ; pulse center frequency (define-param df 0.4) ; pulse width (in frequency) (define-param nfreq 401) ; number of frequencies at which to compute flux (define-param Sw 10) (set! geometry-lattice (make lattice (size sx sy no-size))) (set! geometry (append ; combine lists of objects: (list (make block (center 0 0) (size Nx Ny infinity) (material (make dielectric (epsilon eps))))) (geometric-objects-duplicates (vector3 0 1) -15 15 (geometric-object-duplicates (vector3 1 0) -10 10 (make cylinder (material air) (center 0 0) (radius r1) (height infinity) ))) )) (set! pml-layers (list (make pml (thickness dpml)))) (set-param! resolution 15) ; Set sources (set! sources (list (make source (src (make gaussian-src (frequency fcen) (fwidth df))) (component Ey) (center (+ dpml (* -0.5 sx)) 0) (size 0 Sw)))) (define trans (add-flux fcen df nfreq (make flux-region (center (- (* 0.5 sx) dpml 0.5) 0) (size 0 Ny)))) (run-sources+ (stop-when-fields-decayed 50 Ey (vector3 (- (* 0.5 sx) dpml 0.5) 0) 1e-3) (at-beginning output-epsilon)) (display-fluxes trans) |
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