Abstract
Point-spread-function engineering constitutes an interesting tool for the improvement of the performance of 3D optical imaging devices like high-resolution optical scanning microscopes. Apart from the gains in resolution, which provide an easy method for the estimation of the superresolving abilities of pupil filters, other analytical tools are necessary for the fast computation of the 3D point spread function. Such tools should take into account the non-paraxial nature of microscopy imaging. In this sense, in this paper we report the high numerical-aperture version of the 3D sampling theorem.
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