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(define-param xcen 0)
(define-param ycen 0)
(define-param yihou 2)
(define-param erhou 2)
(define-param zhouqi 3)
(define zhongxinju (/ (+ yihou erhou) 2))

(define-param xjisuanquyu 20)
(define-param yjisuanquyu 8)

(define-param yijiedian 2)
(define-param erjiedian 3)


(set! geometry-lattice (make lattice (size xjisuanquyu yjisuanquyu no-size)))
(set! geometry
      (append
        (list
             (geometric-object-duplicates (vector3 erhou 0) 0 (- zhouqi 1)
              (make block (center xcen ycen)(size yihou infinity infinity)
                           (material (make dielectric (epsilon yijiedian)))))
             (geometric-object-duplicates (vector3 yihou 0) 0 (- zhouqi 1)
              (make block (center (+ xcen zhongxinju) ycen)(size erhou infinity infinity)
                           (material (make dielectric (epsilon erjiedian))))))))

(define-param dpml 1)

(set! pml-layers (list (make pml (thickness dpml))))

(set! resolution 20)

(define-param fcen 1.3)
(define-param df 2.5)
(define-param nfreq 500)
(define yuanchang yjisuanquyu)

(set! sources (list
               (make source
                 (src (make gaussian-src (frequency fcen) (fwidth df)))
                 (component Ey)
                 (center (- xcen yihou) 0)
                 (size 0 yuanchang))))

(set! symmetries (list (make mirror-sym (direction Y) (phase -1))))

(define trans                                       
        (add-flux fcen df nfreq
                  (make flux-region (center (+ (* zhouqi zhongxinju) xcen) 0) (size 0 yuanchang)(direction Y))))

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ERROR: In procedure make-structure:
ERROR: In procedure vector-ref: Wrong type argument in position 1 (expecting vector): #f
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