Dear Professor Steven and all MEEP users I have tried to analyze a simple nonlinear (CHI3) 1D-straght structure with fix index=3.48 but unfortunately it looks like a dispersive material. i.e. the index changes by wavelength so I checked the index by another structure like below: I have used MEEP example for epsilon: http://ab-initio.mit.edu/wiki/index.php/Meep_Tutorial/Material_dispersion But I have changed it like this (a simple linear material with epsilon=12.1104): (reset-meep) (set! geometry-lattice (make lattice (size no-size no-size no-size))) (set-param! resolution 50) (set! default-material (make dielectric (epsilon 12.1104))) (define-param fcen 1) (define-param df 2) (set! sources (list (make source (src (make gaussian-src (frequency fcen) (fwidth df))) (component Ez) (center 0 0 0)))) (define-param kmin 0.3) (define-param kmax 3) (define-param k-interp 99) (define kpts (interpolate k-interp (list (vector3 kmin) (vector3 kmax)))) (define all-freqs (run-k-points 200 kpts)) ; a list of lists of frequencies (map (lambda (kx fs) (map (lambda (f) (print "eps:, " (real-part f) ", " (imag-part f) ", " (sqr (/ kx f)) "\n")) fs)) (map vector3-x kpts) all-freqs) Output is: Epsilon varies from 12.11 to 12.98 for frequencies (0.3 to 2). I have attached the plot. Is there any error that MEEP can’t keep index fix for different frequency? What should I do to fix index? Thanks.
<<attachment: ep-12-1-2-50.jpg>>
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