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Title: Simulating the opto-thermal processes involved in laser induced self-assembly of surface and sub-surface plasmonic nano-structuring
Authors: Bellas, Dimitris V. 
Toliopoulos, Dimosthenis 
Kalfagiannis, Nikolaos 
Siozios, Anastasios 
Nikolaou, Petros 
Kelires, Pantelis C. 
Koutsogeorgis, Demosthenes C. 
Patsalas, Panos A. 
Lidorikis, Elefterios 
Major Field of Science: Engineering and Technology
Field Category: Mechanical Engineering
Keywords: Laser annealing;Nanopatterning;Nanophotonics;Nanostructure;Optothermal;Plasmonic writing;Plasmonics
Issue Date: 30-May-2017
Source: Thin Solid Films, 2017, vol. 630, pp. 7-24
Volume: 630
Start page: 7
End page: 24
Journal: Thin Solid Films 
Abstract: Nano-structuring of metals is one of the greatest challenges for the future of plasmonic and photonic devices. Such a technology calls for the development of ultra-fast, high-throughput and low cost fabrication techniques. Laser processing accounts for the aforementioned properties, representing an unrivalled tool towards the anticipated arrival of modules based in metallic nano-structures, with an extra advantage: the ease of scalability. Specifically, laser nano-structuring of an ultra-thin metal film or an alternating metal film on a substrate/metal film on a substrate results respectively on surface (metallic nanoparticles on the surface of the substrate) or subsurface (metallic nanoparticles embedded in a dielectric matrix) plasmonic patterns with many applications. In this work we investigate theoretically the photo-thermal processes involved in surface and sub-surface plasmonic nano-structuring and compare to experiments. To this end, we present a design process and develop functional plasmonic nano-structures with pre-determined morphology by tuning the annealing parameters like the laser fluence and wavelength and/or the structure parameters like the thickness of the metallic film and the volume ratio of the metal film on a substrate-metal composite. For the surface plasmonic nano-structuring we utilize the ability to tune the laser's wavelength to either match the absorption spectral profile of the metal or to be resonant with the plasma oscillation frequency, i.e. we utilize different optical absorption mechanisms that are size-selective. Thus, we overcome a great challenge of laser induced self assembly by combining simultaneously large-scale character with nanometer scale precision. For subsurface plasmonic nano-structuring, on the other hand, we utilize the temperature gradients that are developed spatially across the metal/dielectric nano-composite structure during the laser treatment. We find that the developed temperature gradients are strongly depended on the nanocrystalline character of the dielectric host which determines its thermal conductivity, the composition of the ceramic/metal and the total thickness of the nano-composite film. The aforementioned material parameters combined with the laser annealing parameters can be used to pre-design the final morphology of the sub-surface plasmonic structure. The proposed processes can serve as a platform that will stimulate further progress towards the engineering of plasmonic devices.
ISSN: 0040-6090
DOI: 10.1016/j.tsf.2016.12.046
Rights: © The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license
Type: Article
Affiliation : University of Ioannina 
Nottingham Trent University 
Cyprus University of Technology 
Aristotle University of Thessaloniki 
Appears in Collections:Άρθρα/Articles

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