Fractal square zone plates

[EN] In this paper we present a novel family of zone plates with a fractal distribution of square zones. The focusing properties of these fractal diffractive lenses coined fractal square zone plates are analytically studied and the influence of the fractality is investigated. It is shown that under monochromatic illumination a fractal square zone plate gives rise a focal volume containing a delimited sequence of two-arms-cross pattern that are axially distributed according to the self-similarity of the lens.We acknowledge the financial support from Ministerio de Ciencia e Innovacion (grants FIS2011-23175 and TRA2009-0215), Generalitat Valenciana (grant PROMETEO2009-077), and Universitat Politecnica de Valencia (grant PAID-05-11), Spain.Calatayud Calatayud, A.; Ferrando Martín, V.; Gimenez Palomares, F.; Furlan, WD.; Saavedra, G.; Monsoriu Serra, JA. (2013). Fractal square zone plates. Optics Communications. 286:42-45. https://doi.org/10.1016/j.optcom.2012.09.002424528