define parameter
we'll run it at every 0.6 time units (about 10 times per period) via (at-every 0.6 output-efield-z).(run-until 200
(at-beginning output-epsilon)
(to-appended "ez" (at-every 0.6 output-efield-z)))
we often want to explore many different values of such parameters. For example, we may want to change the size of the cell, so we'll define it as:
(define-param sx 16) ; size of cell in X direction
(define-param sy 32) ; size of cell in Y direction
(set! geometry-lattice (make lattice (size sx sy no-size)))
define-param is a libctl feature to define variables that can be overridden from the command line. We could now do meep sx=17 tut-wvg-bend-trans.ctl to change the X size to 17, without editing the ctl file, for example. We'll also define a couple of parameters to set the width of the waveguide and the "padding" between it and the edge of the computational cell:
(at-beginning output-epsilon)
(to-appended "ez" (at-every 0.6 output-efield-z)))
we often want to explore many different values of such parameters. For example, we may want to change the size of the cell, so we'll define it as:
(define-param sx 16) ; size of cell in X direction
(define-param sy 32) ; size of cell in Y direction
(set! geometry-lattice (make lattice (size sx sy no-size)))
define-param is a libctl feature to define variables that can be overridden from the command line. We could now do meep sx=17 tut-wvg-bend-trans.ctl to change the X size to 17, without editing the ctl file, for example. We'll also define a couple of parameters to set the width of the waveguide and the "padding" between it and the edge of the computational cell:
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