Abstract
It is demonstrated that the equivalent aperture distribution for a well-collimated FWM (focus wave mode) radiates essentially backward; i.e. the important propagator in the forward-propagating FWM is time-reversed (anticausal). This feature has already been noted for each constituent in various source-free synthesis options, and it is verified here directly, within the context of aperture radiation. The conclusion is that despite their appealing physical properties, these source-free wave fields, when well collimated so that their focusing properties are taken advantages of, are inherently unsuited as elements for direct and efficient modeling of time-dependent causal phenomena.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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