Sub-surface laser nanostructuring in stratified metal/dielectric media: a versatile platform towards flexible, durable and large-scale plasmonic writing

Siozios, A, Kalfagiannis, N ORCID: 0000-0002-4030-5525, Bellas, DV, Bazioti, C, Dimitrakopulos, GP, Vourlias, G, Cranton, WM, Lidorikis, E, Koutsogeorgis, DC ORCID: 0000-0001-6167-1084 and Patsalas, P, 2015. Sub-surface laser nanostructuring in stratified metal/dielectric media: a versatile platform towards flexible, durable and large-scale plasmonic writing. Nanotechnology, 26 (15), p. 155301. ISSN 0957-4484

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Laser nanostructuring of pure ultrathin metal layers or ceramic/metal composite thin films has emerged as a promising route for the fabrication of plasmonic patterns with applications in information storage, cryptography, and security tagging. However, the environmental sensitivity of pure Ag layers and the complexity of ceramic/metal composite film growth hinder the implementation of this technology to large-scale production, as well as its combination with flexible substrates. In the present work we investigate an alternative pathway, namely, starting from non-plasmonic multilayer metal/dielectric layers, whose growth is compatible with large scale production such as in-line sputtering and roll-to-roll deposition, which are then transformed into plasmonic templates by single-shot UV-laser annealing (LA). This entirely cold, large-scale process leads to a subsurface nanoconstruction involving plasmonic Ag nanoparticles (NPs) embedded in a hard and inert dielectric matrix on top of both rigid and flexible substrates. The subsurface encapsulation of Ag NPs provides durability and long-term stability, while the cold character of LA suits the use of sensitive flexible substrates. The morphology of the final composite film depends primarily on the nanocrystalline character of the dielectric host and its thermal conductivity. We demonstrate the emergence of a localized surface plasmon resonance, and its tunability depending on the applied fluence and environmental pressure. The results are well explained by theoretical photothermal modeling. Overall, our findings qualify the proposed process as an excellent candidate for versatile, large-scale optical encoding applications.

Item Type: Journal article
Publication Title: Nanotechnology
Creators: Siozios, A., Kalfagiannis, N., Bellas, D.V., Bazioti, C., Dimitrakopulos, G.P., Vourlias, G., Cranton, W.M., Lidorikis, E., Koutsogeorgis, D.C. and Patsalas, P.
Publisher: Institute of Physics
Date: 24 March 2015
Volume: 26
Number: 15
ISSN: 0957-4484
Divisions: Schools > School of Science and Technology
Depositing User: Jonathan Gallacher
Date Added: 11 Apr 2017 07:07
Last Modified: 09 Jun 2017 14:14

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