Reference : Unclonable human-invisible machine vision markers leveraging the omnidirectional chir...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
http://hdl.handle.net/10993/53948
Unclonable human-invisible machine vision markers leveraging the omnidirectional chiral Bragg diffraction of cholesteric spherical reflectors
English
Agha, Hakam mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
Geng, Yong mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
Ma, Xu mailto [University of Luxembourg > Faculty of Science, Technology and Medecine (FSTM) > >]
Avsar, Deniz Isinsu mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
Kizhakidathazhath, Rijeesh mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
Zhang, Yansong mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
Tourani, Ali mailto [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > Automation >]
Bavle, Hriday mailto [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > Automation >]
Sanchez Lopez, Jose Luis mailto [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > Automation >]
Voos, Holger mailto [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > Automation >]
schwartz, Mathew mailto [New Jersey Institute of Technology]
Lagerwall, Jan mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
25-Oct-2022
Light: Science and Applications
Nature Publishing Group
11
309
10.1038/s41377-022-01002-4
Yes
International
2047-7538
United Kingdom
[en] Cholesteric liquid crystals ; Retroreflection ; Bragg reflection ; Fiducial markers ; Robotics ; Augmented reality
[en] The seemingly simple step of molding a cholesteric liquid crystal into spherical shape, yielding a Cholesteric Spherical Reflector (CSR), has profound optical consequences that open a range of opportunities for potentially transformative technologies. The chiral Bragg diffraction resulting from the helical self-assembly of cholesterics becomes omnidirectional in CSRs. This turns them into selective retroreflectors that are exceptionally easy to distinguish— regardless of background—by simple and low-cost machine vision, while at the same time they can be made largely imperceptible to human vision. This allows them to be distributed in human-populated environments, laid out in the form of QR-code-like markers that help robots and Augmented Reality (AR) devices to operate reliably, and to identify items in their surroundings. At the scale of individual CSRs, unpredictable features within each marker turn them into Physical Unclonable Functions (PUFs), of great value for secure authentication. Via the machines reading them, CSR markers can thus act as trustworthy yet unobtrusive links between the physical world (buildings, vehicles, packaging,...) and its digital twin computer representation. This opens opportunities to address pressing challenges in logistics and supply chain management, recycling and the circular economy, sustainable construction of the built environment, and many other fields of individual, societal and commercial importance.
Fonds National de la Recherche - FnR ; Office of Naval Research Global - ONRG ; Institute of Advanced Studies, University of Luxembourg ; European Commission - EC
TRANSCEND
http://hdl.handle.net/10993/53948
10.1038/s41377-022-01002-4
FnR ; FNR14771094 > Jan Peter Felix Lagerwall > ECLIPSE > Eye-undetectable Cholesteric Liquid Crystal Spheres Realized By Phase Separation And Electrospray > 01/09/2021 > 31/08/2024 > 2020

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