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Hi Sabastien,
I have some questions about the use of SLM.
1)About the macropixels in the SLM, does it mean that each single pixel in the macropixel is modulated with the same phase?
2)And the method about generation of the amplitude object you mentioned in paper DOI: 10.1038/ncomms1078, if we send the two phase mask to get two corresponding speckle patterns successively, does it mean that the intensity pattern by substracting two speckle is the ultimate speckle of the amplitude object? Please forgive my ignorance, it puzzles me a lot.

Best regards

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Hi Zhengquan,

About the macropixels in the SLM, does it mean that each single pixel in the macropixel is modulated with the same phase?

Yes.

And the method about generation of the amplitude object you mentioned in paper DOI: 10.1038/ncomms1078, if we send the two phase mask to get two corresponding speckle patterns successively, does it mean that the intensity pattern by substracting two speckle is the ultimate speckle of the amplitude object?

Not exactly, first we chose phase patterns so that the difference between the two is an amplitude patterns we want, for instance:
E_1 = [-1,1,1] and E_1 = -E_2[-1,-1,1]
then E_3 = E_1-E_2 = [0,1,0]

(note that the difference of two phase patterns is not always an amplitude one)

Then, if you measure the output corresponding COMPLEX patterns E_out_1 and E_out_2, by linearity of the system, you know that:
E_out_3 = E_out_1-E_out_2

Thus you can estimate the output for an amplitude pattern E_3 by sending two phase patterns.

Note that it is linear for complex fields, not for intensity patterns,

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Thanks for your patience and details. it helps me a lot!

Best regards