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

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

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- Unclonable human-invisible machine vision markers leveraging the omnidirectional chiral Bragg diffraction of cholesteric spherical reflectors
- Light: Science & Applications Vol. 11, Issue 11, Pages: 2583-2601(2022)
- Affiliations：
  
  1.University of Luxembourg, Department of Physics & Materials Science, 1511 Luxembourg, Luxembourg
  2.University of Luxembourg, Interdisciplinary Centre for Security, Reliability and Trust (SnT), 1855 Luxembourg, Luxembourg
  3.University of Luxembourg, University of Luxembourg, Department of Engineering, L-1359 Luxembourg, Luxembourg
  4.New Jersey Institute of Technology, College of Architecture and Design, University Heights, Newark, NJ, USA
- Author bio：
  
  Jan P. F. Lagerwall (Jan.Lagerwall@lcsoftmatter.com)
- Funds：
- DOI：10.1038/s41377-022-01002-4
  CLC：
- Published：30 November 2022，
  
  Published Online：25 October 2022，
  
  Received：17 July 2022，
  
  Revised：06 October 2022，
  
  Accepted：07 October 2022
- Accepted：
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Agha, H. et al. Unclonable human-invisible machine vision markers leveraging the omnidirectional chiral Bragg diffraction of cholesteric spherical reflectors. Light: Science & Applications, 11, 2583-2601 (2022).
DOI：

Agha, H. et al. Unclonable human-invisible machine vision markers leveraging the omnidirectional chiral Bragg diffraction of cholesteric spherical reflectors. Light: Science & Applications, 11, 2583-2601 (2022). DOI： 10.1038/s41377-022-01002-4.

摘要

Abstract

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.

关键词

Keywords

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