10.6084/M9.FIGSHARE.C.4592174
Thomas Walger
Théophane Besson
Valentin Flauraud
Roger Hersch
Juergen Brugger
Level-line moires by superposition of cylindrical
micro-lens gratings
Two superposed layers of transparent cylindrical lenslet gratings create classical
moiré fringes, when illuminated from behind. We rely on this observation to conceive special
devices made of superposed lenslet gratings that produce compelling beating shapes, when tilted
against the light. Level-line moirés are created by superposing gratings of cylindrical lenslets
of the same period on both sides of a substrate and by locally shifting some of the cylindrical
lenses according to the moiré theory. Depending on the illumination and the viewing conditions,
constant light intensities or colors move across graphical elements or faces. Such level-line moiré
samples have been fabricated and characterized to determine the optimal fabrication parameters.
Thanks to their striking visual appeal and their relatively challenging fabrication, moirés created
by superposition of lenslets have a high potential for document security, art, and decoration.
20501 Classical and Physical Optics
111302 Optical Technology
The Optical Society
2020
2019-07-29
2020-01-08
Collection
10.1364/JOSAA.37.000209
CC BY 4.0