Application of Photo-Induced Chirality in Covert Authentication
A new technology to write and read covert information in authentication labels is described. This technology uses the phenomenon of photo-induced chirality in Ge2Sb2Te5 thin films to encode the left- or right-circular or linear polarization of the laser beam used to write the label. The written polarization can be revealed by a simple reading device, which is demonstrated to provide the same qualitative information as reading based on cyclotron circular dichroism spectroscopy and imaging. The suggested method, while based on existing manufacturing approaches, offers a balance between technological complexity for writing and simplicity for reading, and may be advantageous as a new authentication technology.
Authors
- Andrew Luers
- Janaki Shanmugam (ORCID: https://orcid.org/0000-0002-7326-5953)
- Konstantin B. Borisenko (ORCID: https://orcid.org/0000-0002-2368-4500)
- Giuliano Siligardi (ORCID: https://orcid.org/0000-0002-4667-6423)
- Tamás Jávorfí (ORCID: https://orcid.org/0000-0003-2661-2438)
- Daniel W. Hewak (ORCID: https://orcid.org/0000-0002-2093-5773)
- Angus I. Kirkland (ORCID: https://orcid.org/0000-0001-8068-1990)
- B. A. O. Williams (ORCID: https://orcid.org/0000-0002-5509-7925)
- Rohanah Hussain (ORCID: https://orcid.org/0000-0001-6207-6631)
- Paul Ewart
Institutions
- Diamond Light Source (GB)
- University of Oxford (GB)
- University of Southampton (GB)
Publication Details
- Journal
- Applied Sciences
- Published
- 2024-10-24
- DOI
- https://doi.org/10.3390/app14219743
- Primary Topic
- Digital Media Forensic Detection
- Type
- article
- Field-Weighted Citation Impact
- 0.00