Dear
I am trying to simulate an inverse opal
illuminated by a white lamp, but i can make the souce
correctly
I try the following code:
with in particular the source
;sources
(define-param lam 3.3) ; wavelength = 3.3um
(define-param lam_max 0.9) ; max wavelength = 5.3um
(define-param lam_min 0.6) ; min wavelength = 1.3um
(define-param fmin (/ 1 lam_max)) ; min frequency
(define-param fmax (/ 1 lam_min)) ; max frequency
(define-param wid (- fmax fmin)) ; spectral pulse width
(set! sources (list
(make source
(src (make continuous-src (frequency fcen) (width wid)))
(component Ex)
(center 0 0 (+ pmlt (* -0.5 sz)))
(size sx sy 0))
))
the full code below
The code work fine for gaussian beam but take long time
for continuos
Any idea ?
Kind Regards
; transmittance/reflectance of a fcc structure
(set! eps-averaging? false); No epsilon averaging
;-------------------EXTERNAL PARAMETERS-----------------------------------
(define-param r_sph 0.3536); Oxide spheres radius
(define-param r_max (/ 1 (sqrt 6))); Thickness of the Si layer grown inside
the opal
(define-param nl 3) ; number of periods = (3 layers each)
(define-param pmlt 0.5) ; if true (1), have air, false (0), PhC
(define-param pad 10); distance between source and sample
(define-param no-phc 1) ; if true (1), have air, false (0), PhC
(define-param a 300) ; Center-to-center distance
;--------------CELL DIMENSIONS-----------------------------------------
(define unitcell (sqrt 3)) ; size of the unitcell in Z
(define distz (/ 1 (sqrt 3))); distance between single layers
(define sx (/ 1 (sqrt 2))) ; size of cell in X direction
(define sy (sqrt 1.5)) ; size of cell in Y direction
(define sz (+ (* 2 pad) (* 2 pmlt) (round (+ 0.5 (* nl unitcell))))) ; size
of cell in Z direction
(set! geometry-lattice (make lattice (size sx sy sz)))
;------------------USEFUL VALUES----------------------------------------
(define sx_half (/ sx 2)); (1/sqrt(8))
(define sy_half (/ sy 2)); (sqrt(3)/sqrt(8))
(define sy_sixth (/ sy 6)); (1/sqrt(3x8))
(define nsx_half (/ sx -2)); -(1/sqrt(8))
(define nsy_half (/ sy -2)); -(sqrt(3)/sqrt(8))
(define nsy_sixth (/ sy -6)); -(1/sqrt(3x8))
(define cell_center (* unitcell (+ 0.5 (* -0.5 nl)))); z-coordinate of the
first unit cell
(define bottom_sample (+ (* unitcell (- nl 1)) cell_center distz (/ 1 (sqrt
8))
)) ; Z coordinate bottom of spheres
(define substrate_centerZ (+ (/ sz 4) (/ bottom_sample 2)))
(define substrate_sizeZ (- (/ sz 2) bottom_sample))
;----------------MATERIALS-----------------------------------------------
(define PMMA (make dielectric (epsilon (* 1.48 1.48))))
(define silk (make dielectric (epsilon (* 1 1 ))))
;--------------GEOMETRY-------------------------------------------------
(set! geometry
(if (= no-phc 1)
(list
(make sphere (center 0 0 0) (radius r_sph) (material air))
(make block (center 0 0 substrate_centerZ) (material silk)
(size sx sy substrate_sizeZ)) ; substrate
)
(append
;SILK
(list (make block (center 0 0 0) (material silk)
(size sx sy sz))) ; silk
;OPAL OF AIR SPHERES
(geometric-objects-duplicates (vector3 0 0 unitcell) 0 (- nl 1)
(list
;Layer A - oxide
(make sphere (center nsx_half nsy_sixth (- cell_center
distz))
(radius r_sph)
(material air))
(make sphere (center sx_half nsy_sixth (- cell_center
distz))
(radius r_sph)
(material air))
(make sphere (center 0 (+ nsy_sixth nsy_half) (- cell_center
distz)) (radius r_sph)
(material air))
(make sphere (center 0 (* 2 sy_sixth) (- cell_center distz))
(radius r_sph)
(material air))
;Layer B - oxide
(make sphere (center nsx_half sy_half cell_center)
(radius r_sph)
(material air))
(make sphere (center nsx_half nsy_half cell_center)
(radius r_sph)(material air))
(make sphere (center sx_half sy_half cell_center) (radius
r_sph)
(material air))
(make sphere (center sx_half nsy_half cell_center)
(radius r_sph)(material air))
(make sphere (center 0 0 cell_center) (radius r_sph)
(material air))
;Layer C - oxide
(make sphere (center nsx_half sy_sixth (+ cell_center
distz))
(radius r_sph)
(material air))
(make sphere (center sx_half sy_sixth (+ cell_center distz))
(radius r_sph)
(material air))
(make sphere (center 0 (+ sy_sixth sy_half) (+ cell_center
distz)) (radius r_sph)
(material air))
(make sphere (center 0 (* 2 nsy_sixth) (+ cell_center
distz))
(radius r_sph)
(material air))
))
;SUBSTRATE
(list (make block (center 0 0 substrate_centerZ) (material silk)
(size sx sy substrate_sizeZ))) ; substrate
)))
;--------------SOURCES-------------------------------------------------
(define-param fcen 0.8) ; pulse center frequency
(define-param df 2) ; pulse width (in frequency)
(define-param nfreq 500) ; number of frequencies at which to compute flux
; (set! sources (list
; (make source
; (src (make gaussian-src (frequency fcen) (fwidth df)))
; (component Ex)
; (center 0 0 (+ pmlt (* -0.5 sz)))
; (size sx sy 0))
; ))
;sources
(define-param lam 3.3) ; wavelength = 3.3um
(define-param lam_max 0.9) ; max wavelength = 5.3um
(define-param lam_min 0.6) ; min wavelength = 1.3um
(define-param fmin (/ 1 lam_max)) ; min frequency
(define-param fmax (/ 1 lam_min)) ; max frequency
(define-param wid (- fmax fmin)) ; spectral pulse width
(set! sources (list
(make source
(src (make continuous-src (frequency fcen) (width wid)))
(component Ex)
(center 0 0 (+ pmlt (* -0.5 sz)))
(size sx sy 0))
))
;-----------RESOLUTION, PERIODICAL BOUNDARIES, PML-----------------
(set-param! k-point (vector3 0))
(set! pml-layers (list (make pml (direction Z) (thickness pmlt))))
(set-param! resolution 20)
;--------------FLUX----------------------------------------------------
(define-param nfreq 500) ; number of frequencies at which to compute flux
(define trans ; transmitted flux
(add-flux fcen df nfreq
(make flux-region
(center 0 0 (- (/ sz 2) 0.5 pmlt)) (size sx sy 0))))
(define refl ; reflected flux
(add-flux fcen df nfreq
(make flux-region
(center 0 0 (+ 5 pmlt (* -0.5 sz))) (size sx sy 0))))
;-------------RUN-----------------------------------------------
; for normal run, load negated fields to subtract incident from refl. fields
(if (= no-phc 0) (load-minus-flux "refl-flux" refl))
(run-sources+ 200
(at-beginning output-epsilon))
; for normalization run, save flux fields for refl. plane
(if (= no-phc 1) (save-flux "refl-flux" refl))
(display-fluxes refl trans)
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