Highly Secure Plasmonic Encryption Keys Combined with Upconversion Luminescence Nanocrystals

Title
Highly Secure Plasmonic Encryption Keys Combined with Upconversion Luminescence Nanocrystals
Authors
한일기장호성고형덕박민지박기선박지훈김재균조영학변동진
Keywords
encryption; upconversion; plasmonic enhancement; graphene transfer
Issue Date
2018-05
Publisher
Advanced functional materials
Citation
VOL 28, NO 21-1800369-8
Abstract
This study proposes a novel and highly secure encryption technology based on plasmonic-enhanced upconversion luminescence (UCL). The technology can be realized by a disordered plasmonic nanostructure composed of a transferred metal nanoparticle– UC nanocrystals (UCNC)– metal (tMUM) film using the graphene transfer process, in which the metal nanoparticles that formed on the graphene layer are transferred using Scotch tape. The plasmonic tMUM film strongly enhances the UCL by a factor of 200 mainly because of the excitation of the gap plasmon polaritons. Meanwhile, the UCNCs in direct contact with the metal film result in luminescence quenching caused by a nonradiative process. Herein, a highly secure anticounterfeit film is developed, which is very hard to duplicate and cannot be reused, using two conflicting features (i.e., emission enhancement and quenching phenomena). The UCL is strongly amplified only when the first (i.e., a random metal nanoparticle array) and second (i.e., UCNCs on a Ag film) codes are very precisely overlapped as designed, thereby generating the originally designed final code. Therefore, our novel high-level security device is expected to be easily applied to protect and identify genuine products.
URI
http://pubs.kist.re.kr/handle/201004/67708
ISSN
1616-301X
Appears in Collections:
KIST Publication > Article
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