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Diffraction Grating

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I have a problem with the COMSOL ray tracing Module. Can anyone help me with that?

Problem: When I simulate the diffraction grating, I face with an interesting and wrong result. When I shine two parallel rays on a diffraction grating surface, the Module does not consider two rays as a beam, and solves the diffraction grating equations independently for these two rays (it does not consider the interference between the rays). What I expect as a correct answer is that, the module must assume these two rays as a beam, then solve the diffraction grating equations, because, in practice, we shine millions of rays on a diffraction grating and get the interference pattern (waves interference) at different diffraction orders.

For example, if I want to simulate the number of illuminated grooves effect on the diffracted beams, it is not possible, because it considers the rays independently.

Thanks in Advance,

0 Replies Last Post Jun 12, 2017, 5:56 a.m. EDT
COMSOL Moderator

Hello Behzad Sardari

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