Unclonable human-invisible machine vision markers leveraging the omnidirectional chiral Bragg diffraction of cholesteric spherical reflectors

Hakam Agha; Yong Geng; Xu Ma; Deniz Işınsu Avşar; Rijeesh Kizhakidathazhath; Yan-Song Zhang; Ali Tourani; Hriday Bavle; Jose-Luis Sanchez-Lopez; Holger Voos; Mathew Schwartz; Jan P. F. Lagerwall

doi:10.1038/s41377-022-01002-4

Light: Science & Applications (Oct 2022)

Unclonable human-invisible machine vision markers leveraging the omnidirectional chiral Bragg diffraction of cholesteric spherical reflectors

Hakam Agha,
Yong Geng,
Xu Ma,
Deniz Işınsu Avşar,
Rijeesh Kizhakidathazhath,
Yan-Song Zhang,
Ali Tourani,
Hriday Bavle,
Jose-Luis Sanchez-Lopez,
Holger Voos,
Mathew Schwartz,
Jan P. F. Lagerwall

Affiliations

Hakam Agha: University of Luxembourg, Department of Physics & Materials Science
Yong Geng: University of Luxembourg, Department of Physics & Materials Science
Xu Ma: University of Luxembourg, Department of Physics & Materials Science
Deniz Işınsu Avşar: University of Luxembourg, Department of Physics & Materials Science
Rijeesh Kizhakidathazhath: University of Luxembourg, Department of Physics & Materials Science
Yan-Song Zhang: University of Luxembourg, Department of Physics & Materials Science
Ali Tourani: University of Luxembourg, Interdisciplinary Centre for Security, Reliability and Trust (SnT)
Hriday Bavle: University of Luxembourg, Interdisciplinary Centre for Security, Reliability and Trust (SnT)
Jose-Luis Sanchez-Lopez: University of Luxembourg, Interdisciplinary Centre for Security, Reliability and Trust (SnT)
Holger Voos: University of Luxembourg, Interdisciplinary Centre for Security, Reliability and Trust (SnT)
Mathew Schwartz: New Jersey Institute of Technology, College of Architecture and Design, University Heights
Jan P. F. Lagerwall: University of Luxembourg, Department of Physics & Materials Science

DOI: https://doi.org/10.1038/s41377-022-01002-4
Journal volume & issue: Vol. 11, no. 1
pp. 1 – 19

Abstract

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Cholesteric Spherical Reflectors (CSRs) are omnidirectional retroreflectors that are selective in circular polarization and wavelength, enabling human-invisible fiducial markers for applications in robotics, augmented reality, anti-counterfeiting, circular economy and more

Published in Light: Science & Applications

ISSN: 2047-7538 (Online)
Publisher: Nature Publishing Group
Country of publisher: United Kingdom
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: https://www.nature.com/lsa/

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