Optical identification using imperfections in 2D materials

Cao, Yameng and Robson, Alexander James and Alharbi, Abdullah and Roberts, Jonny and Woodhead, Christopher and Noori, Yasir and Bernardo Gavito, Ramon and Roedig, Utz and Falko, Vladimir and Young, Robert James (2017) Optical identification using imperfections in 2D materials. 2D Materials, 4 (4). ISSN 2053-1583

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Abstract

The ability to uniquely identify an object or device is important for authentication [1]. Imperfections, locked into structures during fabrication, can be used to provide a fingerprint that is challenging to reproduce. In this paper, we propose a simple optical technique to read unique information from nanometer-scale defects in 2D materials. Imperfections created during crystal growth or fabrication lead to spatial variations in the bandgap of 2D materials that can be characterized through photoluminescence measurements. We show a simple setup involving an angle- adjustable transmission filter, simple optics and a CCD camera can capture spatially- dependent photoluminescence to produce complex maps of unique information from 2D monolayers. Atomic force microscopy is used to verify the origin of the optical signature measured, demonstrating that it results from nanometer-scale imperfections. This solution to optical identification with 2D materials could be employed as a robust security measure to prevent counterfeiting.

Item Type: Journal Article
Journal or Publication Title: 2D Materials
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/2200/2210
Subjects:
Departments: Faculty of Science and Technology > Physics
Faculty of Science and Technology > School of Computing & Communications
ID Code: 86873
Deposited By: ep_importer_pure
Deposited On: 30 Jun 2017 09:48
Refereed?: Yes
Published?: Published
Last Modified: 19 Feb 2020 03:54
URI: https://eprints.lancs.ac.uk/id/eprint/86873

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