Chapter 7 Angular Spectrum Representation
original field at z= 0. The spatial frequencies (k2 x + k 2 y) >k 2 of the original field are filtered out during propagation and the information on high spatial variations gets lost. Hence, there is always a loss of information on propagating from near-to far-field and only structures with lateral dimensions larger than ∆x ≈ 1 2k = λ ...
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