Level-line moires by superposition of cylindrical
micro-lens gratings
Posted on 2020-01-08 - 15:15
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.
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Walger, Thomas; Besson, Théophane; Flauraud, Valentin; Hersch, Roger; Brugger, Juergen (2020). Level-line moires by superposition of cylindrical
micro-lens gratings. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.4592174.v1
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AUTHORS (5)
TW
Thomas Walger
TB
Théophane Besson
VF
Valentin Flauraud
RH
Roger Hersch
JB
Juergen Brugger