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(set-param! resolution 40) ; pixels/um
(define Si (make medium (index 3.45)))
(define-param dpml 1.0)
(set! pml-layers (list (make pml (thickness dpml))))
(define-param sx 5)
(define-param sy 3)
(set! geometry-lattice
(make lattice (size (+ sx (* 2 dpml)) (+ sy (* 2 dpml)) no-size)))
(define-param a 1.0) ; waveguide width/height
(define-param s 1.0) ; waveguide separation distance
(set! geometry (list
(make block (center (* -0.5 (+ s a)) 0)
(size a a infinity) (material Si))
(make block (center (* 0.5 (+ s a)) 0)
(size a a infinity) (material Si))))
(define-param xodd? true)
(set! symmetries (list
(make mirror-sym (direction X) (phase (if xodd? -1 +1)))
(make mirror-sym (direction Y) (phase -1))))
(set! k-point (vector3 0 0 0.5))
(define-param fcen 0.22)
(define-param df 0.06)
(set! sources (list
(make source (src (make gaussian-src (frequency fcen) (fwidth df)))
(component Ey) (center (* -0.5 (+ s a)) 0) (size a a 0))
(make source (src (make gaussian-src (frequency fcen) (fwidth df)))
(component Ey) (center (* 0.5 (+ s a)) 0) (size a a 0)
(amplitude (if xodd? -1.0 1.0)))))
(run-sources+ 200
(after-sources (harminv Ey (vector3 (* 0.5 (+ s a)) 0) fcen df)))
(define f (harminv-freq-re (car harminv-results)))
(print "freq:, " s ", " f "\n")
(reset-meep)
(change-sources! (list
(make eigenmode-source
(src (make gaussian-src (frequency f) (fwidth df)))
(size sx sy 0)
(center 0 0 0)
(eig-band (if xodd? 2 1))
(eig-kpoint k-point)
(eig-match-freq? false)
(eig-parity ODD-Y))))
(define wvg-flux (add-flux f 0 1
(make flux-region (direction Z)
(center 0 0) (size sx sy 0))))
(define wvg-force (add-force f 0 1
(make force-region (direction X) (weight +1)
(center (* 0.5 s) 0) (size 0 sy))
(make force-region (direction X) (weight -1)
(center (+ (* 0.5 s) a) 0) (size 0 sy))))
(run-sources+ 1500)
(display-fluxes wvg-flux)
(display-forces wvg-force)
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