Hi all,
for those following the list, you may remember this question which I
asked (and was answered patiently by Steven) about setting a freq.
dependent dielectric function (dispersion) on an object defined by a
function in space.
Here's how the object is described (DFB laser for those interested):
(define pix2 (* 2 pi))
(define (f p)
(if (> (vector3-y p) (/ (cos (* (vector3-x p) pix2)) (* 2 (/ 1
pitch)))) nbeps xeps))
(set! geometry
(append ; combine lists of
objects:
(list
;-------MEDIUM----------------------------------------------------------------
(make block (center 0 0 0) (size infinity infinity infinity)
(material (make dielectric (epsilon nbeps)
)))
;-------emitting polymer layer-------------------------------------
(make block (center 0 (- (/ thb -2) (/ pitch 2)) 0) (size infinity thb
infinity)
(material (make dielectric (epsilon xeps)
(polarizations
(make polarizability
(omega 0.59) (gamma 0.001) (delta-epsilon 0.35)))
)))
;-------sinusoidal
layer---------------------------------------------------------
(make block (center 0 0 0) (size sx pitch infinity)
(material (make material-function (epsilon-func f)
(polarizations
(make polarizability
(omega 0.59) (gamma 0.001) (delta-epsilon 0.35)))
)))
)))
At the time, Steven answered that as long as there was one fixed object
with the same polarizability defined, then MEEP would apply the same
polarizability parameters to the sinusoidal layer (described as a
function of space). It turns out that it doesn't seem to happen. The
results suggest that the emitting layer has a freq. dependent dielectric
but not the sinusoidal object. The cavity mode given by harminv suggest
that the refractive index of the sinusoidal wave is indeed fixed, and
not freq dependent. Is there a way for me to test the dielectric
constant vs freq. of a single object (in this case the sinusoidal
object)? How could I explicitly tell MEEP that the polarizability
parameters need to apply to the sinusoidal object as well? Hopefully, I
won't have to bother the list with this problem again! Thanks for your
help.
Nic
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