updated handling of evanescent wave #46
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When the resolution of a lens is high, 1 - wvln_mm ** 2 * (fx ** 2 + fy ** 2) < 0 happens at high spatial freqs. This causes nan values in the sqrt() operation, and then affects the fourier transform of the image.
Cast the square root content prior to complex128 to represent the evanescent modes, and avoid the nan issue.