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Soutenance de thèse

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Séminaire

SEMINAR: Imperfect materials for information security au  Laboratoire Pierre Aigrain – ENS – 24 rue Lhomond – 75005 Paris

Lundi 21 Janvier 2019 – 13:30      salle Conf IV

The ability to uniquely identify an object or device is important for authentication. Imperfections, locked into structures during fabrication, can be used to provide a fingerprint that is challenging to reproduce. In this talk, I will present a simple optical technique to read unique information from nanometer-scale defects in quantum materials. Imperfections created during crystal growth or fabrication lead to spatial variations in the bandgap of 2D materials that can be characterised through photoluminescence measurements. I will show a simple setup using 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.

Contacts:

Gabriel Hétet (LPA) – gabriel.hetet@lpa.ens.fr

Alexandre Tallaire (IRCP) – alexandre.tallaire@chimie-paristech.fr

Information about Pr Rob Young, University of Lancaster

Rob is an experimental physicist with a passion for developing practical applications of quantum technologies. Rob’s contribution in this exciting new field was seeded by a Master’s degree in physics from Oxford University (2002), before moving to Cambridge to complete a PhD in experimental quantum information processing. Here he was part of the world-leading Semiconductor Physics Group, led by Prof. Sir Michael Pepper. For his PhD he won two awards, from the Institute of Physics and an EU network. He holds a Chair in Quantum Information at Lancaster University, he is a founding member of Lancaster University’s Quantum Technology Centre. He is now leading his own group: http://qopto.com/ and he has created a start-up to commercialize his research activities https://quantumbase.com/.