Chalcogenide Films: Laser Generation of Sub‐Micrometer Wrinkles in a Chalcogenide Glass Film as Physical Unclonable Functions (Adv. Mater. 38/2020)

Abstract

“Pop-art” like patterns resulting from the interaction of a single laser pulse focused on a-Ge based chalcogenide thin film capped with a SiN layer are presented by Jérôme Gaudin and co-workers. These nondeterministic surface patterns, described in article number 2003032, are wrinkles with a height of less than 100 nm and sub-micrometer periodicity, which depends on the impinging laser fluence. Application as physical unclonable functions is demonstrated using a fast recognition algorithm.