/
meep.scm.in
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meep.scm.in
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; Copyright (C) 2005-2020 Massachusetts Institute of Technology
;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, write to the Free Software
; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
; ****************************************************************
; for define* (keyword args) in guile 1.8
(if (< (string->number (major-version)) 2)
(use-modules (ice-9 optargs)))
; Get the number of arguments to a function p. However, some
; older versions of Guile (e.g. 1.2) do not support the 'arity
; property, and procedure-property just returns false. In
; this case, we assume that the procedure returns 1 argument,
; as this is the most useful default for our purposes. Sigh.
(define (procedure-num-args p)
(let ((arity (if (defined? 'procedure-minimum-arity)
(procedure-minimum-arity p)
(procedure-property p 'arity))))
(if arity (car arity) 1)))
; ****************************************************************
; Set print-ok? to whether or not we are the MPI master process.
; Also, MPI doesn't support interactive mode. However, don't try this
; if we are running within gen-ctl-io, as it won't work.
(if (not (defined? 'output-source)) ; (a function defined by gen-ctl-io)
(begin
(set-param! print-ok? (zero? (meep-my-rank)))
(set-param! interactive? (= 1 (meep-count-processors)))))
; ****************************************************************
(define-input-var epsilon-input-file "" 'string)
(define-class material-type no-parent)
(define-class susceptibility no-parent
(define-property sigma-offdiag (vector3 0 0 0) 'vector3)
(define-property sigma-diag no-default 'vector3))
(define-class lorentzian-susceptibility susceptibility
(define-property frequency no-default 'number)
(define-property gamma no-default 'number))
(define-class drude-susceptibility susceptibility
(define-property frequency no-default 'number)
(define-property gamma no-default 'number))
(define-class noisy-lorentzian-susceptibility lorentzian-susceptibility
(define-property noise-amp no-default 'number))
(define-class noisy-drude-susceptibility drude-susceptibility
(define-property noise-amp no-default 'number))
(define-class gyrotropic-lorentzian-susceptibility lorentzian-susceptibility
(define-property bias no-default 'vector3))
(define-class gyrotropic-drude-susceptibility drude-susceptibility
(define-property bias no-default 'vector3))
(define-class gyrotropic-saturated-susceptibility susceptibility
(define-property frequency no-default 'number)
(define-property gamma no-default 'number)
(define-property bias no-default 'vector3)
(define-property alpha no-default 'number))
(define polarizability lorentzian-susceptibility) ; backwards compat
(define omega frequency) ; backwards compat
(define (sigma x) (sigma-diag x x x))
(define-class medium material-type
(define-property epsilon-diag (vector3 1 1 1) 'vector3)
(define-property epsilon-offdiag (vector3 0 0 0) 'vector3)
(define-property mu-diag (vector3 1 1 1) 'vector3)
(define-property mu-offdiag (vector3 0 0 0) 'vector3)
(define-property E-susceptibilities '() (make-list-type 'susceptibility))
(define-property H-susceptibilities '() (make-list-type 'susceptibility))
(define-property E-chi2-diag (vector3 0 0 0) 'vector3)
(define-property E-chi3-diag (vector3 0 0 0) 'vector3)
(define-property H-chi2-diag (vector3 0 0 0) 'vector3)
(define-property H-chi3-diag (vector3 0 0 0) 'vector3)
(define-property D-conductivity-diag (vector3 0 0 0) 'vector3)
(define-property B-conductivity-diag (vector3 0 0 0) 'vector3)
)
; backwards compatibility:
(define E-polarizations E-susceptibilities)
(define H-polarizations H-susceptibilities)
(define (epsilon eps) (epsilon-diag eps eps eps))
(define (mu m) (mu-diag m m m))
(define dielectric medium) ; old name for backwards compatibility
(define polarizations E-polarizations) ; backwards compatibility
; useful shortcuts for isotropic conductivity
(define (D-conductivity c) (D-conductivity-diag c c c))
(define (B-conductivity c) (B-conductivity-diag c c c))
; shortcuts for isotropic nonlinearities
(define (E-chi2 d) (E-chi2-diag d d d))
(define (E-chi3 d) (E-chi3-diag d d d))
(define (H-chi2 d) (H-chi2-diag d d d))
(define (H-chi3 d) (H-chi3-diag d d d))
(define chi2 E-chi2) (define chi3 E-chi3) ; backwards compatibility
(define-class perfect-metal material-type)
; arbitrary material(x)
(define-class material-function material-type
(define-property material-func no-default 'function
(lambda (p) (= 1 (procedure-num-args p)))))
(define (epsilon-func f) ; convenience wrapper
(material-func (lambda (p) (make dielectric (epsilon (f p))))))
(define (index n) (epsilon (* n n))) ; convenient substitute for epsilon
; use the solid geometry classes, variables, etcetera in libgeom:
; (one specifications file can include another specifications file)
(include "@LIBCTL_DIR@/utils/geom.scm")
; Include materials library
(include "materials.scm")
(if (defined? 'meep-component-Ex) (include "meep-enums.scm"))
(define CYLINDRICAL -2) ; special value of dimensions for cylindrical coords
(define AUTOMATIC -1) ; special value for directions, when auto-determined
; ****************************************************************
; Multilevel-atom nonlinear susceptibilities
(define-class transition no-parent
(define-property from-level no-default 'integer non-negative?)
(define-property to-level no-default 'integer non-negative?)
(define-property transition-rate 0 'number) ; nonradiative rate (0 if none)
(define-property frequency 0 'number) ; radiative frequency (0 if none)
(define-property sigma-diag (vector3 1 1 1) 'vector3) ; per-transition sigma
(define-property gamma 0 'number) ; optical damping rate
(define-property pumping-rate 0 'number)) ; pumping rate (0 if none)
(define (transition-time t) (transition-rate (/ t)))
(define-class multilevel-atom susceptibility
(define-property initial-populations '() (make-list-type 'number))
(define-property transitions '() (make-list-type 'transition)))
; ****************************************************************
; Add some predefined variables, for convenience:
(define vacuum (make dielectric (epsilon 1.0)))
(define air vacuum)
(define metal (make perfect-metal))
(define perfect-electric-conductor metal)
(define perfect-magnetic-conductor (make medium (mu (/ -0.0)))) ; -infinity
(define infinity 1.0e20) ; big number for infinite dimensions of objects
(set! default-material vacuum)
(define pi (* 4.0 (atan 1.0)))
; ****************************************************************
; some utilities
; round x to dig digits after the decimal place
(define (round-dig dig x) (/ (round (* x (expt 10 dig))) (expt 10 dig)))
; display a comma-delimited list of values, prefixed by the data-name
; and the run index, with data a list of values.
(define-param run-index 0)
(define (display-run-data data-name data)
(print data-name run-index ":")
(map (lambda (v) (print ", " v)) data)
(print "\n"))
; display a list of data arrays (all required to be of same length)
; as comma-separated values, prefixed with name (and the run index).
(define (display-csv name . ds)
(if (not (null? ds))
(apply
map
(cons
(lambda (. vs) (display-run-data name vs))
ds))))
; ****************************************************************
; More input variables
; list of extra materials not explicit in the geometry, e.g. those
; used in material-functions, so that Meep doesn't miss them
(define-param extra-materials '())
(define structure '())
; list of sources added by init-fields (below)
(define-param sources '())
(define-param m 0) ; angular dependence exp(i m phi) in cylindrical
; If false (default), Meep forces certain field components for |m|>1 to
; be zero for |m| pixels from r=0. This is something of a hack
; which seems to ensure stability for Courant = 0.5 regardless of m,
; at the expense of some accuracy near r=0. If true, in order to
; remain stable, the Courant factor should be ~ min[0.5, 1 / (|m| + 0.5)]
; or so assuming the computational cell includes the r=0 origin.
(define-param accurate-fields-near-cylorigin? false)
(define-param force-complex-fields? false)
(define-param k-point false)
; whether to use the "beta" trick to handle kz in 2d
(define-param kz-2d "complex")
(define fields '())
(define-param subpixel-tol 1e-4)
(define-param subpixel-maxeval 100000)
; a "global" conductivity to add to all materials, mostly
; for the convenience of Casimir calculations
(define-param global-D-conductivity 0)
(define-param global-B-conductivity 0)
; ****************************************************************
; Setting up the structure
(define-class symmetry no-parent
(define-property direction no-default 'integer)
(define-property phase 1.0 'cnumber))
(define-class rotate2-sym symmetry)
(define-class rotate4-sym symmetry)
(define-class mirror-sym symmetry)
(define ALL -1) ; special value for directions, when all values
(define-class pml no-parent
(define-property thickness no-default 'number)
(define-property direction ALL 'integer)
(define-property side ALL 'integer)
(define-property strength 1.0 'number) ; obsolete: R -> R^strength
(define-property R-asymptotic 1e-15 'number positive?)
(define-property mean-stretch 1.0 'number (lambda (x) (>= x 1.0)))
(define-property pml-profile (lambda (u) (* u u)) 'function))
(define-class absorber pml) ; just a scalar conductivity ramp
(export-type (make-list-type 'symmetry))
(export-type (make-list-type 'pml))
(export-type (make-list-type 'material-type))
(define-param symmetries '())
(define-param pml-layers '())
(define-param num-chunks 0)
(define-param Courant 0.5)
(define (infer-dimensions k)
(if (and (not (null? k)) (= dimensions 3)) ; infer dimensions
(if (and (= (vector3-z (object-property-value geometry-lattice 'size))
no-size)
(or (not k) (not (equal? kz-2d "3d")) (zero? (vector3-z k))))
2
3)
dimensions))
(define (require-dimensions!)
(if (null? structure) (set-dimensions (infer-dimensions k-point))))
(define-class volume-class no-parent
(define-property center no-default 'vector3)
(define-property size (vector3 0 0 0) 'vector3))
(define (volume . args)
(require-dimensions!)
(let ((v (apply make (cons volume-class args))))
(let ((cen (object-property-value v 'center))
(sz (object-property-value v 'size)))
(new-meep-volume
(vector3- cen (vector3-scale 0.5 sz))
(vector3+ cen (vector3-scale 0.5 sz))))))
(define-param eps-averaging? true) ; 10% slower, but huge accuracy gains
(define (init-structure . k_)
(let ((k (if (null? k_) '() (car k_)))
(s (object-property-value geometry-lattice 'size)))
(set! structure (make-structure
(infer-dimensions k)
s geometry-center
resolution
eps-averaging? subpixel-tol subpixel-maxeval
(and ensure-periodicity (not (not k)))
geometry extra-materials
default-material epsilon-input-file
pml-layers symmetries num-chunks Courant
global-D-conductivity global-B-conductivity))))
; ****************************************************************
; Adding sources
(define-class src-time no-parent
(define-property is-integrated? false 'boolean))
(define-class continuous-src src-time
(define-property frequency no-default 'number)
(define-property start-time 0 'number)
(define-property end-time infinity 'number)
(define-property width 0 'number)
(define-property cutoff 3.0 'number)
(define-derived-property swigval 'SCM
(lambda (o)
(let ((s (new-meep-continuous-src-time
(* 1.0 (object-property-value o 'frequency))
(object-property-value o 'width)
(object-property-value o 'start-time)
(object-property-value o 'end-time)
(object-property-value o 'cutoff))))
(meep-src-time-is-integrated-set s (object-property-value o 'is-integrated?))
s))))
(define-class gaussian-src src-time
(define-property frequency no-default 'number)
(define-property width no-default 'number)
(define-property start-time 0 'number)
(define-property cutoff 5.0 'number)
(define-derived-property swigval 'SCM
(lambda (o)
(let ((s (new-meep-gaussian-src-time
(* 1.0 (object-property-value o 'frequency))
(object-property-value o 'width)
(object-property-value o 'start-time)
(+ (object-property-value o 'start-time)
(* 2 (object-property-value o 'width)
(object-property-value o 'cutoff))))))
(meep-src-time-is-integrated-set s (object-property-value o 'is-integrated?))
s))))
(define-class custom-src src-time
(define-property src-func no-default 'function)
(define-property start-time (- infinity) 'number)
(define-property end-time infinity 'number)
(define-derived-property swigval 'SCM
(lambda (o)
(let ((s (new-meep-custom-src-time
(object-property-value o 'src-func)
(object-property-value o 'start-time)
(object-property-value o 'end-time))))
(meep-src-time-is-integrated-set s (object-property-value o 'is-integrated?))
s))))
(define (fwidth df) (width (/ df))) ; to specify frequency width instead
(define (wavelength lam) (frequency (/ lam)))
(define (period T) (frequency (/ T)))
(define-class source no-parent
(define-property src no-default 'src-time)
(define-property component no-default 'integer)
(define-property center no-default 'vector3)
(define-property size (vector3 0 0 0) 'vector3)
(define-property amplitude 1.0 'cnumber)
(define-property amp-func '() 'SCM))
; the following definitions are taken from MPB
(define NO-PARITY 0)
(define EVEN-Z 1)
(define ODD-Z 2)
(define EVEN-Y 4)
(define ODD-Y 8)
(define TE EVEN-Z)
(define TM ODD-Z)
; special component for eigenmode-source (not defined during gen-ctl-io)
(define ALL-COMPONENTS (if (defined? 'Dielectric) Dielectric 99))
(define-class eigenmode-source source
; the following two properties have special default values -- if we
; detect these values, we will replace the values by those of the
; size and center of the parent class (a bit hackish, but...)
(define-property eig-lattice-size (vector3 -1 -1 -1) 'vector3)
(define-property eig-lattice-center (vector3 infinity infinity infinity) 'vector3)
(define-property component ALL-COMPONENTS 'integer) ; new default val
(define-property direction AUTOMATIC 'integer)
(define-property eig-band 1 'integer positive?)
(define-property eig-kpoint (vector3 0) 'vector3)
(define-property eig-match-freq? true 'boolean)
(define-property eig-parity NO-PARITY 'integer)
(define-property eig-resolution 0 'integer non-negative?)
(define-property eig-tolerance 1e-12 'number positive?))
(define (add-source s f) ; add source s to fields f
(define (dflt v v0 vd) (if (vector3= v v0) vd v))
(let ((A (object-property-value s 'amp-func))
(cen (object-property-value s 'center))
(sz (object-property-value s 'size)))
(if (object-member? 'eigenmode-source s)
(let* ((ecen (dflt (object-property-value s 'eig-lattice-center)
(vector3 infinity infinity infinity) cen))
(esz (dflt (object-property-value s 'eig-lattice-size)
(vector3 -1 -1 -1) sz))
(v (volume (center cen) (size sz)))
(d0 (object-property-value s 'direction))
(d (if (negative? d0)
(meep-fields-normal-direction fields v)
d0)))
(if (null? A)
(meep-fields-add-eigenmode-source f
(object-property-value s 'component)
(object-property-value (object-property-value s 'src) 'swigval)
d v
(volume (center ecen) (size esz))
(object-property-value s 'eig-band)
(object-property-value s 'eig-kpoint)
(object-property-value s 'eig-match-freq?)
(object-property-value s 'eig-parity)
(object-property-value s 'eig-resolution)
(object-property-value s 'eig-tolerance)
(object-property-value s 'amplitude))
(meep-fields-add-eigenmode-source f
(object-property-value s 'component)
(object-property-value (object-property-value s 'src) 'swigval)
d v
(volume (center ecen) (size esz))
(object-property-value s 'eig-band)
(object-property-value s 'eig-kpoint)
(object-property-value s 'eig-match-freq?)
(object-property-value s 'eig-parity)
(object-property-value s 'eig-resolution)
(object-property-value s 'eig-tolerance)
(object-property-value s 'amplitude) A)))
(if (null? A)
(meep-fields-add-volume-source f
(object-property-value s 'component)
(object-property-value (object-property-value s 'src) 'swigval)
(volume (center cen) (size sz))
(* 1.0 (object-property-value s 'amplitude)))
(meep-fields-add-volume-source f
(object-property-value s 'component)
(object-property-value (object-property-value s 'src) 'swigval)
(volume (center cen) (size sz))
A (* 1.0 (object-property-value s 'amplitude)))))))
; ****************************************************************
; Setting up the fields
(define init-fields-hooks '()) ; list of thunks to execute after init-fields
(define (init-fields)
(if (null? structure) (init-structure k-point))
(let ((kz2d (if (= (infer-dimensions k-point) 2) kz-2d "3d")))
(set! fields (new-meep-fields structure
(if (= dimensions CYLINDRICAL) m 0)
(if (and (not (equal? kz2d "3d")) k-point)
(vector3-z k-point) 0.0)
(not accurate-fields-near-cylorigin?)))
(if (not (or force-complex-fields?
(and (= dimensions CYLINDRICAL) (not (zero? m)))
(not (for-all? symmetries
(lambda (s)
(zero? (imag-part
(object-property-value s 'phase))))))
(not (or (not k-point)
(and (equal? kz2d "real/imag")
(= (vector3-x k-point) 0)
(= (vector3-y k-point) 0))
(vector3= k-point (vector3 0))))))
(meep-fields-use-real-fields fields)
(print "Meep: using complex fields.\n"))
(if k-point (meep-fields-use-bloch fields
(if (not (equal? kz2d "3d"))
(vector3 (vector3-x k-point)
(vector3-y k-point))
k-point))))
(map (lambda (s) (add-source s fields)) sources)
(map (lambda (thunk) (thunk)) init-fields-hooks))
(define (meep-time)
(if (null? fields) (init-fields))
(meep-fields-time fields))
(define (meep-round-time)
(if (null? fields) (init-fields))
(meep-fields-round-time fields))
(define (get-field-point c pt)
(meep-fields-get-field fields c pt))
(define (get-epsilon-point pt)
(meep-fields-get-eps fields pt))
; ****************************************************************
; Various ways to restart all or part of the simulation.
(define (change-k-point! k)
(set! k-point k)
(if (not (null? fields))
(if (and (not (or (not k-point) (vector3= k-point (vector3 0))))
(not (zero? (meep-fields-is-real-get fields))))
(begin (delete-meep-fields fields)
(set! fields '())
(init-fields))
(if k-point (meep-fields-use-bloch fields k-point)))))
(define (change-sources! new-sources)
(set! sources new-sources)
(if (not (null? fields))
(begin
(meep-fields-remove-sources fields)
(map (lambda (s) (add-source s fields)) sources))))
(define (reset-meep)
(delete-meep-fields fields) (set! fields '())
(delete-meep-structure structure) (set! structure '()))
(define (restart-fields)
(if (not (null? fields))
(begin
(meep-fields-t-set fields 0)
(meep-fields-zero-fields fields))
(init-fields)))
; ****************************************************************
; Flux spectra
(define-class flux-region no-parent
(define-property center no-default 'vector3)
(define-property size (vector3 0 0 0) 'vector3)
(define-property direction AUTOMATIC 'integer)
(define-property weight 1.0 'cnumber))
(define (fields-add-fluxish-stuff add-dft-stuff fields fcen df nfreq stufflist . nperiods)
(define vl '()) ; volume_list of flux regions
(map (lambda (f)
(let* ((v (volume (center (object-property-value f 'center))
(size (object-property-value f 'size))))
(d0 (object-property-value f 'direction))
(d (if (negative? d0)
(meep-fields-normal-direction fields v)
d0))
(c (meep-direction-component Sx d)))
(set! vl
(make-volume-list
(volume (center (object-property-value f 'center))
(size (object-property-value f 'size)))
c
(object-property-value f 'weight)
vl))))
stufflist)
(let ((stuff
(if (eq? add-dft-stuff meep-fields-add-dft-near2far)
(add-dft-stuff fields vl
(- fcen (/ df 2)) (+ fcen (/ df 2)) nfreq
(if (not (null? nperiods)) (car nperiods)))
(add-dft-stuff fields vl
(- fcen (/ df 2)) (+ fcen (/ df 2)) nfreq))))
(delete-meep-volume-list vl)
stuff))
(define (fields-add-flux fields fcen df nfreq . fluxes)
(fields-add-fluxish-stuff meep-fields-add-dft-flux
fields fcen df nfreq fluxes))
(define (add-flux fcen df nfreq . fluxes)
(if (null? fields) (init-fields))
(apply fields-add-flux (append (list fields fcen df nfreq) fluxes)))
(define (scale-flux-fields s f)
(meep-dft-flux-scale-dfts f s))
(define (get-flux-freqs f)
(std-vector-double-to-scm (meep-dft-flux-freq-get f)))
(export-type (make-list-type 'number))
(define (get-fluxes f)
(dft-flux-flux f))
(define (display-fluxes . fluxes)
(if (not (null? fluxes))
(apply display-csv
(append (list "flux"
(get-flux-freqs (car fluxes)))
(map get-fluxes fluxes)))))
(define (load-flux fname flux)
(if (null? fields) (init-fields))
(meep-dft-flux-load-hdf5 flux fields fname "" (get-filename-prefix)))
(define (save-flux fname flux)
(if (null? fields) (init-fields))
(meep-dft-flux-save-hdf5 flux fields fname "" (get-filename-prefix)))
(define (load-minus-flux fname flux)
(load-flux fname flux)
(meep-dft-flux-scale-dfts flux -1.0))
; ****************************************************************
; Mode monitor
(define mode-region flux-region)
(define (fields-add-mode-monitor fields fcen df nfreq . fluxes)
(if (not (= (length fluxes) 1)) (error "add-mode-monitor expected just one mode-region."))
(let* ((region (car fluxes))
(v (volume (center (object-property-value region 'center))
(size (object-property-value region 'size))))
(d0 (object-property-value region 'direction))
(d (if (< d0 0)
(meep-fields-normal-direction fields v)
d0)))
(meep-fields-add-mode-monitor fields d v (- fcen (/ df 2)) (+ fcen (/ df 2)) nfreq)))
(define (add-mode-monitor fcen df nfreq . fluxes)
(if (null? fields) (init-fields))
(apply fields-add-mode-monitor (append (list fields fcen df nfreq) fluxes)))
; ****************************************************************
; Energy spectra
(define-class energy-region no-parent
(define-property center no-default 'vector3)
(define-property size (vector3 0 0 0) 'vector3)
(define-property direction 0 'integer)
(define-property weight 1.0 'cnumber))
(define (fields-add-energy fields fcen df nfreq . energys)
(fields-add-fluxish-stuff meep-fields-add-dft-energy
fields fcen df nfreq energys))
(define (add-energy fcen df nfreq . energys)
(if (null? fields) (init-fields))
(apply fields-add-energy (append (list fields fcen df nfreq) energys)))
(define (scale-energy-fields s f)
(meep-dft-energy-scale-dfts f s))
(define (get-energy-freqs f)
(std-vector-double-to-scm (meep-dft-energy-freq-get f)))
(define (get-electric-energy f)
(dft-energy-electric f))
(define (get-magnetic-energy f)
(dft-energy-magnetic f))
(define (get-total-energy f)
(dft-energy-total f))
(define (display-electric-energy . energys)
(if (not (null? energys))
(apply display-csv
(append (list "electric-energy"
(get-energy-freqs (car energys)))
(map get-electric-energy energys)))))
(define (display-magnetic-energy . energys)
(if (not (null? energys))
(apply display-csv
(append (list "magnetic-energy"
(get-energy-freqs (car energys)))
(map get-magnetic-energy energys)))))
(define (display-total-energy . energys)
(if (not (null? energys))
(apply display-csv
(append (list "total-energy"
(get-energy-freqs (car energys)))
(map get-total-energy energys)))))
(define (load-energy fname energy)
(if (null? fields) (init-fields))
(meep-dft-energy-load-hdf5 energy fields fname "" (get-filename-prefix)))
(define (save-energy fname energy)
(if (null? fields) (init-fields))
(meep-dft-energy-save-hdf5 energy fields fname "" (get-filename-prefix)))
(define (load-minus-energy fname energy)
(load-energy fname energy)
(meep-dft-energy-scale-dfts energy -1.0))
; ****************************************************************
; Force spectra (from stress tensor) - very similar interface to flux spectra
(define-class force-region no-parent
(define-property center no-default 'vector3)
(define-property size (vector3 0 0 0) 'vector3)
(define-property direction no-default 'integer)
(define-property weight 1.0 'cnumber))
(define (fields-add-force fields fcen df nfreq . forcees)
(fields-add-fluxish-stuff meep-fields-add-dft-force
fields fcen df nfreq forcees))
(define (add-force fcen df nfreq . forcees)
(if (null? fields) (init-fields))
(apply fields-add-force (append (list fields fcen df nfreq) forcees)))
(define (scale-force-fields s f)
(meep-dft-force-scale-dfts f s))
(define (get-force-freqs f)
(std-vector-double-to-scm (meep-dft-force-freq-get f)))
(define (get-forces f)
(dft-force-force f))
(define (display-forces . forcees)
(if (not (null? forcees))
(apply display-csv
(append (list "force"
(get-force-freqs (car forcees)))
(map get-forces forcees)))))
(define (load-force fname force)
(if (null? fields) (init-fields))
(meep-dft-force-load-hdf5 force fields fname "" (get-filename-prefix)))
(define (save-force fname force)
(if (null? fields) (init-fields))
(meep-dft-force-save-hdf5 force fields fname "" (get-filename-prefix)))
(define (load-minus-force fname force)
(load-force fname force)
(meep-dft-force-scale-dfts force -1.0))
; ****************************************************************
; Near-to-far-field transformations (again similar to dft-foobar)
(define-class near2far-region no-parent
(define-property center no-default 'vector3)
(define-property size (vector3 0 0 0) 'vector3)
(define-property direction AUTOMATIC 'integer)
(define-property weight 1.0 'cnumber))
(define (fields-add-near2far fields fcen df nfreq nperiods . near2fars)
(fields-add-fluxish-stuff meep-fields-add-dft-near2far
fields fcen df nfreq near2fars nperiods))
(define* (add-near2far fcen df nfreq #:key (nperiods 1) . near2fars)
(if (null? fields) (init-fields))
;; Keyword arguments automatically get added to the "rest" list in guile,
;; so we have to remove the nperiods key and value from near2fars
(apply fields-add-near2far (append (list fields fcen df nfreq nperiods)
(delq #:nperiods (delq nperiods near2fars)))))
(define (scale-near2far-fields s f)
(meep-dft-near2far-scale-dfts f s))
(define (get-near2far-freqs f)
(std-vector-double-to-scm (meep-dft-near2far-freq-get f)))
(define (get-farfield f x)
(dft-near2far-farfield f x))
(define (output-farfields near2far fname where resolution)
(meep-dft-near2far-save-farfields near2far fname (get-filename-prefix)
where resolution))
(define (flux near2far df where resolution)
(dft-near2far-flux near2far df where resolution))
(define (load-near2far fname near2far)
(if (null? fields) (init-fields))
(meep-dft-near2far-load-hdf5 near2far fields fname "" (get-filename-prefix)))
(define (save-near2far fname near2far)
(if (null? fields) (init-fields))
(meep-dft-near2far-save-hdf5 near2far fields fname "" (get-filename-prefix)))
(define (load-minus-near2far fname near2far)
(load-near2far fname near2far)
(meep-dft-near2far-scale-dfts near2far -1.0))
; ****************************************************************
; dft fields
(define (add-dft-fields components freq_min freq_max nfreq . where)
(if (null? fields) (init-fields))
(let ((vol (if (null? where) (meep-fields-total-volume fields) (car where))))
(meep-fields-add-dft-fields fields components vol freq_min freq_max nfreq)))
(define (output-dft dft_fields fname)
(if (null? fields) (init-fields))
(meep-fields-output-dft fields dft_fields fname))
; ****************************************************************
; Generic step functions: these are functions which are called
; (potentially) at every time step. They can either be a thunk
; or they can take one argument, to-do. to-do is either 'step
; or 'finish, where 'step means to output (or whatever)
; normally, and 'finish is passed once at the end of the run
; (and is used to close files, print summary output, etcetera).
; step functions can be either thunks (the common case), or
; can take a "to-do" argument that is currently either 'step
; or 'finish (so that they can clean up at the end of a run).
(define (eval-step-func func to-do)
(if (= 0 (procedure-num-args func))
(if (eq? to-do 'step) (func))
(func to-do)))
; Some convenient wrappers for step functions passed to run. e.g., these
; can be used to only output at certain times, instead of ata every time step.
(define (combine-step-funcs . step-funcs)
(lambda (to-do)
(map (lambda (f) (eval-step-func f to-do)) step-funcs)))
; generic wrapper
(define (when-true-funcs cond? step-funcs)
(lambda (to-do)
(if (or (eq? to-do 'finish) (cond?))
(map (lambda (f) (eval-step-func f to-do)) step-funcs))))
; evaluate step-funcs whenever (cond?) is true/false.
(define (when-true cond? . step-funcs) (when-true-funcs cond? step-funcs))
(define (when-false cond? . step-funcs)
(when-true-funcs (lambda () (not (cond?))) step-funcs))
; output at an interval of dT (in meep/simulation time).
(define (at-every dT . step-funcs)
(if (null? fields) (init-fields))
(let ((Tlast (meep-round-time)))
(lambda (to-do)
(let ((T (meep-round-time)))
(if (or (eq? to-do 'finish)
(>= T (+ Tlast dT (* -0.5 (meep-fields-dt-get fields)))))
(begin
(map (lambda (f) (eval-step-func f to-do)) step-funcs)
(set! Tlast T)))))))
(define (after-time T . step-funcs)
(if (null? fields) (init-fields))
(let ((T0 (meep-round-time)))
(when-true-funcs (lambda () (>= (meep-round-time) (+ T0 T))) step-funcs)))
(define (before-time T . step-funcs)
(if (null? fields) (init-fields))
(let ((T0 (meep-round-time)))
(when-true-funcs (lambda () (< (meep-round-time) (+ T0 T))) step-funcs)))
(define (at-time T . step-funcs)
(let ((done? false))
(after-time T (lambda (to-do)
(if (or (not done?) (eq? to-do 'finish))
(map (lambda (f) (eval-step-func f to-do)) step-funcs))
(set! done? (or done? (eq? to-do 'step)))))))
(define (after-sources . step-funcs)
(if (null? fields) (init-fields))
(apply after-time
(cons (- (meep-fields-last-source-time fields) (meep-round-time))
step-funcs)))
; after sources plus a time T.
(define (after-sources+ T . step-funcs)
(if (null? fields) (init-fields))
(apply after-time
(cons (- (+ (meep-fields-last-source-time fields) T) (meep-round-time))
step-funcs)))
(define (during-sources . step-funcs)
(if (null? fields) (init-fields))
(apply before-time
(cons (- (meep-fields-last-source-time fields) (meep-round-time))
step-funcs)))
; the user could just call functions, but this functions saves the user
; from having to manually call init-fields
(define (at-beginning . step-funcs)
(let ((done? false))
(lambda (to-do)
(if (not done?)
(begin
(map (lambda (f) (eval-step-func f to-do)) step-funcs)
(set! done? true))))))
; for completeness (although the user could just do this after running):
(define (at-end . step-funcs)
(lambda (to-do)
(if (eq? to-do 'finish)
(begin
(map (lambda (f) (eval-step-func f 'step)) step-funcs)
(map (lambda (f) (eval-step-func f 'finish)) step-funcs)))))
; run the step-funcs with the magnetic fields synchronized in time
; with the electric fields
(define (synchronized-magnetic . step-funcs)
(lambda (to-do)
(meep-fields-synchronize-magnetic-fields fields)
(map (lambda (f) (eval-step-func f to-do)) step-funcs)
(meep-fields-restore-magnetic-fields fields)))
; ****************************************************************
; File output functions (can only be called after init-fields).
(define-param filename-prefix "")
(define (get-filename-prefix)
(if (eq? filename-prefix false)
""
(if (and (not (null? include-files))
(string-null? filename-prefix))
(string-append
(strip-suffix ".scm"
(strip-suffix ".ctl" (cdr (split-pathname (car include-files))))))
filename-prefix)))
; Use output directory instead of outputting in same directory;
; uses init-fields-hooks to handle fields not yet initted.
(define (use-output-directory . dname_)
(let ((dname (if (null? dname_)
(string-append (get-filename-prefix) "-out")
(car dname_))))
(let ((hook
(let ((trashed? false)) ; only trash output directory once per run
(lambda ()
(print "Meep: using output directory \"" dname "\"\n")
(meep-fields-set-output-directory fields dname)
(if (not trashed?) (meep-trash-output-directory dname))
(set! trashed? true)))))
(set! init-fields-hooks (cons hook init-fields-hooks))
(if (not (null? fields)) (hook))
(set! filename-prefix false)
dname)))
(define-param output-volume '()) ; region to output; NULL for everywhere
(define output-append-h5 '()) ; h5 file to append data to (NULL if none)
; hook function called with the filename after every HDF5 files is created;
; this can be used to convert the file into other formats, etcetera.
(define output-h5-hook (lambda (fname) false)) ; default is no-op
(define output-single-precision? false) ; output single-prec to save space
(define meep-last-eps-filename "") ; most recent epsilon file outputted
(define (output-component c . h5file)
(if (null? fields) (error "init-fields is required before output-component"))
(meep-fields-output-hdf5
fields c
(if (null? output-volume)
(meep-fields-total-volume fields)
output-volume)
(if (null? h5file) output-append-h5 (car h5file))
(and (null? h5file) (not (null? output-append-h5)))
output-single-precision?
(get-filename-prefix))
(if (null? h5file)
(let ((nm (meep-fields-h5file-name fields (meep-component-name c)
(get-filename-prefix) true)))
(if (eq? c Dielectric) (set! meep-last-eps-filename nm))
(output-h5-hook nm))))
; cs = list of components, and func is function of position & these components
(define (output-field-function-helper name cs func real-only? h5file)
(if (null? fields) (error "init-fields is required before output-field-function"))
(meep-fields-output-hdf5
fields name
(cons cs func)
(if (null? output-volume)
(meep-fields-total-volume fields)
output-volume)
(if (null? h5file) output-append-h5 (car h5file))
(and (null? h5file) (not (null? output-append-h5)))
output-single-precision?
(get-filename-prefix)
real-only?)
(if (null? h5file)
(output-h5-hook (meep-fields-h5file-name fields
name (get-filename-prefix) true))))
(define (output-field-function name cs func . h5file)
(output-field-function-helper name cs func false h5file))
(define (output-real-field-function name cs func . h5file)
(output-field-function-helper name cs func true h5file))
(define (output-components fname . cs)
(if (null? fields) (error "init-fields is required before output-component"))
(let ((f
(if (null? output-append-h5)
(list (meep-fields-open-h5file fields fname (meep-h5file-WRITE)
(get-filename-prefix) true))
'())))
(map (lambda (c)
(apply output-component (cons c f))
(if (null? output-append-h5)
(meep-h5file-prevent-deadlock (car f))))
cs)
(if (null? output-append-h5) (delete-meep-h5file (car f))))
(if (null? output-append-h5)
(output-h5-hook (meep-fields-h5file-name
fields fname (get-filename-prefix) true))))
; convenience functions, similar to MPB:
(define (output-epsilon) (output-component Dielectric))