Spiral Zone Plates and Moire Pattern - PostScript

Postscript lattices

A few lattices for the demonstration of the moire pattern (or moire fringes, wikipedia) and for diffractions.

• Lattices of lines (ps lub pdf)
• Lattices of lines with variable spacings (ps lub pdf)
• Circles on a square lattice (ps)
• Circles on a hexagonal lattice (ps)
• Large Fresnel Zone Plates, also spiral ones, rather for moire than diffraction (ps, pdf)
• Arrays of Zone Plates and Spiral Zone Plates with different topological charge (i.e. number of arms) and different focal length (note that for most of printing resolutions, only some of them will work)
  • spiral_zone_plates_a4_f333mm.ps
  • spiral_zone_plates_a4_f666mm.ps
  • spiral_zone_plates_a4_f1000mm.ps
  • spiral_zone_plates_a4_f1333mm.ps
  • spiral_zone_plates_a4_f2000mm.ps
  • spiral_zone_plates_small_a4_f333mm.ps
  • spiral_zone_plates_small_a4_f1000mm.ps

You can open .ps files in GhostScript+GSView (http://www.cs.wisc.edu/~ghost). You can open PostScript files in any text editor - it is a programming language.

You can print the files on foil, but the quality is going to be poor (600dpi) and the contrast will very low. The best is to use DTP polygraphic technique (1200-3600dpi, higher is better; high contrast).

Additional didactical stuff

• Isaac Amidror, The moiré demonstration kit: A guided tour through the fascinating world of moiré effects
• Image Resizing for the Web and Email.
• Huguenin et al, Topological defects in moiré fringes with spiral zone plates
• Emin Gabrielyan, The basics of line moiré patterns and optical speedup
• Piotr Migdał et al, Wavefront sensor with Fresnel zone plates for use in an undergraduate laboratory Am. J. Phys. 76, 229 (2008) doi:10.1119/1.2820390