Hi meep users,
I want to calculate nonlinear index variation in waveguide but I am not sure
my method is correct. Could you show me if I am wrong.
in tutorial, “Or, one can alternatively get the intensity at a single point
by calling get-field-point and passing Sx etc. for the component” is
suggested for intensity.
1) My structure is 2D.
So I use the following command separately for Sx and Sy at the center of
waveguide.
-------------------------------------------
(define (my-print-pointsx)
(print "pointsx:, " (meep-time) ", "
(get-field-point Sx (vector3 0 0 0)) "\n"))
(run-until 400 my-print-pointsx)
----------------------
(define (my-print-pointsy)
(print "pointsy:, " (meep-time) ", "
(get-field-point Sy (vector3 0 wgy 0)) "\n"))
(run-until 400 my-print-pointsy)
-----------------------------------------
2) Then using the grep function, output file is converted to dat.
I have a two file sx.dat and sy.dat which include time variation of
intensity at single point.
3) open the dat file and obtain intensity variation using with S=sqrt ( Sx^2
+Sy^2)
4) As a result, taken the one period (in meep time) average to get S_
average
5) <delta_n>=n2 x S_average
best...
Onder
Pamukkale University
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