Abstract

A method is proposed to compute and synthesize the microrelief of a diffractive optical element to produce a new visual security feature – the vertical 3D/3D switch effect. The security feature consists in the alternation of two 3D color images when the diffractive element is tilted up/down. Optical security elements that produce the new security feature are synthesized using electron-beam technology. Sample optical security elements are manufactured that produce 3D to 3D visual switch effect when illuminated by white light. Photos and video records of the vertical 3D/3D switch effect of real optical elements are presented. The optical elements developed can be replicated using standard equipment employed for manufacturing security holograms. The new optical security feature is easy to control visually, safely protected against counterfeit, and designed to protect banknotes, documents, ID cards, etc.

© 2016 Optical Society of America

Diffractive optical element with asymmetric microrelief for creating visual security features

Alexander Goncharsky, Anton Goncharsky, and Svyatoslav Durlevich
Opt. Express 23(22) 29184-29192 (2015)

Cylindrical computer-generated hologram for displaying 3D images

Anton Goncharsky and Svyatoslav Durlevich
Opt. Express 26(17) 22160-22167 (2018)

Fabrication of diffraction based security elements using direct laser interference patterning

Florian Rößler, Tim Kunze, and Andrés Fabián Lasagni
Opt. Express 25(19) 22959-22970 (2017)

Fabrication of digital rainbow holograms and 3-D imaging using SEM based e-beam lithography

An. Firsov, A. Firsov, B. Loechel, A. Erko, A. Svintsov, and S. Zaitsev
Opt. Express 22(23) 28756-28770 (2014)

Diffractive optical elements for optical identification

Vishal Gandhi, Joni Orava, Hemmo Tuovinen, Toni Saastamoinen, Janne Laukkanen, Seppo Honkanen, and Markku Hauta-Kasari
Appl. Opt. 54(7) 1606-1611 (2015)