Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Faceted gratings for an optical security feature

Not Accessible

Your library or personal account may give you access

Abstract

A method of optimizing and manufacturing a diffractive blazed grating array (DBA) is proposed to create a visual security feature when illuminated by a divergent light-emitting diode source. A pure phase grating array serving as the optical security component consists of blazed grating cells with the same size, 75 µm. After a divergent spherical wave is decomposed into harmonic waves, each grating cell of the DBA locally deflects the harmonic-waves into predefined directions and forms a feature pattern on the target plane. Particularly, a two-step optimization method is further developed for optimizing the period and orientation of each grating cell. The DBA sample is fabricated by using our home-built parallel direct-write photoplotter with a resolution of 0.75 µm. Both numerical simulations and optical experiments are demonstrated to validate the proposed model. Since the optical security component developed is a surface relief structure of a single polymer material, it can be replicated for mass production by using standard roll to roll nanoimprint technology. The design algorithm proposed in this work will enable the extension of the optical security elements to a broader realm and facilitate extensive developments in other research fields of the optics community, such as light-shaping, specific illumination for lithography, and microscope systems.

© 2020 Optical Society of America

Full Article  |  PDF Article
More Like This
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)

Color dynamics of diffraction gratings: evaluation and applications in optical security

Paulo Pires and José Manuel Rebordão
Appl. Opt. 38(35) 7183-7192 (1999)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (9)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (13)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved