Periodic Arrays of Diamond‐Shaped Silver Nanoparticles: From Scalable Fabrication by Template‐Assisted Solid‐State Dewetting to Tunable Optical Properties. (22nd May 2019)

• Record Type: Journal Article
• Authors: Jacquet, Paul; Bouteille, Barbara; Dezert, Romain; Lautru, Joseph; Podor, Renaud; Baron, Alexandre; Teisseire, Jéremie; Jupille, Jacques; Lazzari, Rémi; Gozhyk, Iryna
• Is Part Of: Advanced functional materials. Volume 29:Number 28(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-05-22
• Subjects: anisotropic nanoparticles -- dewetting -- lattice mode -- localized surface plasmon -- silver; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201901119
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Periodic arrays of anisotropic silver nanoparticles having peculiar optical properties are fabricated at a macroscopic scale. The proposed scalable method is based on temperature‐assisted solid‐state dewetting of a continuous thin layer deposited on a silica substrate patterned by the nanoimprint technique. The resulting nanoparticles are shaped like diamonds and are half‐embedded into the patterned silica. A period‐dependent optimum in film thickness for the quality of spatial organization is found and discussed in terms of thermodynamics and, for the first time, in terms of the role of grains in the dewetting process. The optical properties of the arrays are driven by not only simply the particle shape but also the lattice period and the degree of order. A surface lattice resonance that disperses with the underlying period is evidenced experimentally and confirmed by optical simulations. The opportunity to fabricate and tune such an assembly of plasmonic particles on transparent substrate opens interesting perspectives for not only fundamental photonics but also potential optical applications. Abstract : Ag nanoparticle arrays obtained by solid‐state dewetting are investigated. Their optical response is strongly impacted by not only surface lattice resonances, but also the dewetting quality and the individual shape of particles. Three main process parameters modifying the two latter are identified: grain size in the film prior to dewetting, film volume by unit cell, and interface energies.