We present multifractal zone plates (MFZPs) as what is to our knowledge a new family of diffractive lenses whose structure is based on the combination of fractal zone plates (FZPs) of different orders. The typical result is a composite of two FZPs with the central one having a first-order focal length f surrounded by outer zones with a third-order focal length f. The focusing properties of different members of this family are examined and compared with conventional composite Fresnel zone plates. It is shown that MFZPs improve the axial resolution and also give better performance under polychromatic illumination.
© 2010 Optical Society of America
Diffraction and Gratings
Original Manuscript: April 14, 2010
Revised Manuscript: June 13, 2010
Manuscript Accepted: June 13, 2010
Published: July 26, 2010
Fernando Giménez, Walter D. Furlan, Arnau Calatayud, and Juan A. Monsoriu, "Multifractal zone plates," J. Opt. Soc. Am. A 27, 1851-1855 (2010)