Hi everyone i have performed near field scattering measurement from my newly designed system the particle is composite particle the strange thing we have gotten is that in the inside of the particle intensity is low as compared to the ends and from end to 1 microns(i mean in the vacinity of particle or in surroundings of particle)... i am talking about the S0 because S0 is the total intensity so it should be more in the center but it is not ,i don't understand this i repeated my experiment 20 times but still got same but in case of conventional optical intensity(from conventional optical microscope) it is right, in the center it is maxim and to corners it is decay...can anyone explain this fact
Sir my particle is a composite particle not full sphere(close to sphere), its size is about one micron ,i have used light of 532 nm ,the material of particle is An alloy (TiAlN).
Sir if that is the reason you are saying then why original conventional intensity of optical field is right (i mean it is maximum in center)a nd it decay exponentially but images of stokes parameter shows the intensity in the center zero but in the corner and from a limited distance from the corner they show intensity...
I'm not an expert in scattering but if you make your optical measurements with defective optical system (or choose the wrong working distance) you can easily get your pattern (low intesity in the center, high intensity in the borders), see pictures. They show how gaussian near field is frustrated by these two mentioned factors.
Thanks for your's reply, @Romuald is that possible that if the particle structure is amorphous due to the arrangement of atoms can it be possible??
@Vladmir if this is due to fault of apparatus then why i got same in my simulations result by using FDTD when i focus just above the particle???
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