Aberration-like cusped focusing in the post-paraxial Talbot effect

Details Aberration-like cusped focusing in the post-paraxial Talbot effect Aberration-like cusped focusing in the post-paraxial Talbot effect

2012-04-26

arxiv.org/abs/1204.5994v1

Physics

Optics

8 pages, 3 figures, IoP style

Scientific paper

We present an analysis of self-imaging in a regime beyond the paraxial, where deviation from simple paraxial propagation causes apparent self-imaging aberrations. The resulting structures are examples of aberration without rays and are described analytically using post-paraxial theory. They are shown to relate to, but surprisingly do not precisely replicate, a standard integral representation of a diffraction cusp. Beyond the Talbot effect, this result is significant as it illustrates that the effect of aberration -- as manifested in the replacement of a perfect focus with a cusp-like pattern -- can occur as a consequence of improving the paraxial approximation, rather than due to imperfections in the optical system.

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