Fourier Transform, Optical Computing, Free Space Optics.
factor, a transposition in one plane only, and a reversal of the coefficients in one direction. For each ​(j,k), we define the array c⁽ʲ ᵏ⁾​ with shape ​(nx,ny) by: where we define the modulo operator %​ in the following way: if ​n and m​ are two positive integers, ​n%m is the integer between ​0