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from camfr import *
from matplotlib.pyplot import *
from numpy import *

set_lambda(1.55)
set_N(1)
set_polarisation(TE)

sio2=Material(1.45)
silicon=Material(3.46)
air=Material(1.0)

w2=arange(0.01,6,0.8)
transmission=[]

for tw in w2:
    slab=Slab(sio2(4.995)+silicon(0.01)+sio2(4.995))
    slab=Slab(sio2(5-w2/2)+silicon(w2)+sio2(5-w2/2)

x=arrange(0,tw,0.8)
              
field1=[slab.mode(0).field((coord(tx,0,0).E1() for tx in x]
field2=[slab.mode(0).field((coord(tx,0,0)).E1()*(slab.n(Coord(tx,0,0)))**2 for tx in x]
index=[slab.n((coord(tx,0,0)) for tx in x]

M=max(field)
y=M/2
[m,n]=find(abs(M-y)<0.00001)
Q=m-n
      
plot(x,real(Q))
plot(x,absolute(index))
show()
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