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., LIDORIKIS, E., DIMITRAKOPULOS, G.P., PLIATSIKAS, N., VOURLIAS, G., KEHAGIAS, T., KOMNINOU, P., CRANTON, W., 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), 1-13.

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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. Keywords : Annealing; Encoding (symbols); Light sensitive materials; Metal nanoparticles; Nanocomposite films; Nanocomposites; Nanoparticles; Optical data processing; Optical films; Photosensitivity; Plasmons; Surface plasmon resonance; Thin films, Laser annealing; Laser processing parameters; Laser-matter interactions; Nanocomposite thin films; Optical encoding; Physico-chemical mechanisms; Plasmonic nanoparticle; Selective crystallization, Silver

Item Type:	Article
Research Institute, Centre or Group - Does NOT include content added after October 2018:	Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Electronic Materials and Sensors Research Group
Identification Number:	https://doi.org/10.1088/0022-3727/48/28/285306
Page Range:	1-13
Depositing User:	Wayne Cranton
Date Deposited:	23 Jun 2016 10:47
Last Modified:	18 Mar 2021 18:15
URI:	https://shura.shu.ac.uk/id/eprint/12472

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