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; Example file illustrating an eigenmode source, generating a waveguide mode
; (requires recent MPB version to be installed before Meep is compiled)
(set! geometry-lattice (make lattice (size 16 8 no-size)))
; an asymmetrical dielectric waveguide:
(set! geometry (list
(make block (center 0 0) (size infinity 1 infinity)
(material (make dielectric (epsilon 12))))
(make block (center 0 0.3) (size infinity 0.1 infinity)
(material air))))
; create a transparent source that excites a right-going waveguide mode
(set! sources (list
(make eigenmode-source
(src (make continuous-src (frequency 0.15)))
(size 0 6 0)
(center -5 0)
(component ALL-COMPONENTS)
(eig-parity TM)
)))
(set! pml-layers (list (make pml (thickness 1.0))))
(set-param! force-complex-fields? true) ; so we can get time-average flux
(set-param! resolution 10)
(run-until 200
(at-beginning output-epsilon)
(at-end (output-png+h5 Ez "-a yarg -A $EPS -S3 -Zc dkbluered")))
(print "left-going flux = " ; (averaged over y region of width 1.8)
(/ (flux-in-box X (volume (center -6 0) (size 1.8 6 0))) -1.8)
"\n")
(print "right-going flux = " ; (averaged over y region of width 1.8)
(/ (flux-in-box X (volume (center +6 0) (size 1.8 6 0))) +1.8)
"\n")
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