Laser-matter interactions, phase changes and diffusion phenomena during laser annealing of plasmonic AlN:Ag templates and their applications in optical encoding

Siozios, A., Koutsogeorgis, D.C. ORCID: 0000-0001-6167-1084, Lidorikis, E., Dimitrakopulos, G.P., Pliatsikas, N., Vourlias, G., Kehagias, T., Komninou, P., Cranton, W. ORCID: 0000-0002-0142-7810, Kosmidis, C. and Patsalas, P., 2015. Laser-matter interactions, phase changes and diffusion phenomena during laser annealing of plasmonic AlN:Ag templates and their applications in optical encoding. Journal of Physics D: Applied Physics, 48 (28), p. 285306. ISSN 0022-3727

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Abstract

Nanocomposite thin films incorporating silver nanoparticles
are emerging as photosensitive templates for optical encoding applications. However, a deep understanding of the fundamental physicochemical mechanisms occurring during laser-matter interactions is still lacking. In this work, the photosensitivity of AlN:Ag plasmonic nanocomposites is thoroughly examined and a series of UV laser annealing parameters, such as wavelength, fluence and the number of pulses are investigated. We report and study effects such as the selective crystallization of the AlN matrix, the enlargement of the Ag nanoparticle inclusions by diffusion of laser-heated Ag and the outdiffusion of Ag to the film's surface. Detailed optical calculations contribute to the
identification and understanding of the aforementioned physical mechanisms and of their dependency on the laser processing parameters. We are then able to predetermine the plasmonic response of processed AlN:Ag nanocomposites and demonstrate its potential by means of optically encoding an overt or covert cryptographic pattern.

Item Type:	Journal article
Publication Title:	Journal of Physics D: Applied Physics
Creators:	Siozios, A., Koutsogeorgis, D.C., Lidorikis, E., Dimitrakopulos, G.P., Pliatsikas, N., Vourlias, G., Kehagias, T., Komninou, P., Cranton, W., Kosmidis, C. and Patsalas, P.
Publisher:	Institute of Physics Publishing
Date:	22 June 2015
Volume:	48
Number:	28
ISSN:	0022-3727
Identifiers:	Number Type 10.1088/0022-3727/48/28/285306 DOI
Divisions:	Schools > School of Science and Technology
Record created by:	Linda Sullivan
Date Added:	19 Jun 2017 09:04
Last Modified:	24 Mar 2022 14:50
URI:	https://irep.ntu.ac.uk/id/eprint/30988

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