How to find out the position matrix from Intensity matrix?

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MOHD 2013-1-4

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https://ww2.mathworks.cn/matlabcentral/answers/57921-how-to-find-out-the-position-matrix-from-intensity-matrix

Hi sir,

I sending following program by using this I am finding intensity in the focal plane for an X-polarized (linearly polarized light) beam. By using this program I got intensity in the focal plane. But I facing the problem to locate position of this intensity matrix. How we can get position of intensity, where it is located in the focal plane. Can anyone help me in this regard.

Here kx,ky position vectors in pupil plane.

dim=32;
lamda=531e-9;
k1=2*pi/lamda;
[kx,ky]=meshgrid(-1:2/(dim-1):1);
circ=sqrt(kx.^2+ky.^2)<1;
alp=asin(0.6);
k0=1/sin(alp);
k=512;
kz=sqrt(k0^2-(kx.^2+ky.^2));
Gx=((k0*ky.^2+kz.*kx.^2)./(k0*(kx.^2+ky.^2)));
Gy=sqrt(k0./kz).*((kz-k0).*kx.*ky)./(k0*(kx.^2+ky.^2));
Gz=sqrt(k0./kz).*(kx./k0);
Ex=fftshift(fft2(Gx.*circ,k,k));
Ix=Ex.*conj(Ex);
Ey=fftshift(fft2(Gy.*circ,k,k));
Iy=Ey.*conj(Ey);
Ez=fftshift(fft2(Gz.*circ,k,k));
Iz=Ez.*conj(Ez);
Itot=Ix+Iy+Iz;
figure(1)
imagesc(Itot);
colormap gray;
axis image;
figure(2)
plot(Itot(k/2,:))

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MOHD 2013-1-5

In the focal plane, Itot(R,C) for all rows and columns?

Walter Roberson 2013-1-5

For example, once you have calculated Itot, what does Itot(7, 19) represent? For example does it represent the strength of Zeta Beam that Sardath would use to transport Vath Sarn 7 hours and 19 minutes into the past?

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