DOE for the formation of the effect of switching between two images when an element is turned by 180 degrees

Anton Goncharsky,Svyatoslav Durlevich

doi:10.1038/s41598-020-67590-6

Anton Goncharsky, Svyatoslav Durlevich

Open Access

https://doi.org/10.1038/s41598-020-67590-6

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Journal: Scientific Reports	Publication Date: Jun 30, 2020
Citations: 4	License type: open-access

Affiliation: Lomonosov Moscow State University

Abstract

An optical security element forming different 2D images when it is turned by 180 degrees is developed and manufactured for the first time. A synthesis technology is developed that incorporates the computation of the beam pattern in elementary hogels with sizes smaller than 100 microns, computation of the phase function of the diffractive optical element (DOE), and formation of the microrelief of the DOE using electron-beam technology. The DOE employed is a multilevel kinoform with an asymmetrical microrelief shaped with a precision of 10 nm. The resulting security feature is easy to control visually, and the DOE is securely protected against counterfeiting. These DOEs are easy to replicate using standard technologies in the manufacturing of embossed holograms and can be used to protect bank notes, securities, and documents against counterfeiting.

Highlights

An optical security element forming different 2D images when it is turned by 180 degrees is developed and manufactured for the first time
The main security feature is the switching of the image when the optical element is turned by an angle θ equal to 180 degrees
An optical security element forming different images when turned by 180 degrees is developed and made for the first time

Summary

Introduction

An optical security element forming different 2D images when it is turned by 180 degrees is developed and manufactured for the first time. The resulting security feature is easy to control visually, and the DOE is securely protected against counterfeiting. These DOEs are easy to replicate using standard technologies in the manufacturing of embossed holograms and can be used to protect bank notes, securities, and documents against counterfeiting. Optical elements are currently widely used to protect bank notes and documents. There are two main technologies for manufacturing the originals of security-relief DOEs. The first technology is based on the use of optical radiation to record the o riginals[1,11]. The original optical security element consisted of binary diffractive gratings and was recorded o ptically[10]

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