Directional elastic wave propagation in high-aspect-ratio photoresist gratings : Liquid infiltration and aging
Alonso-Redondo, Elena (Max Planck Institute for Polymer Research)
Gueddida, Abdellatif (Université Mohamed I. Département de Physique)
Li, Ju (University of Pennsylvania. Department of Materials Science and Engineering)
Graczykowski, Bartlomiej (Institut Català de Nanociència i Nanotecnologia)
Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)
Pennec, Yan (Université de Lille. Institut d'Électronique de Microélectronique et de Nanotechnologie)
Yang, Shu (University of Pennsylvania. Department of Materials Science and Engineering)
Djafari-Rouhani, Bahram (Université de Lille. Institut d'Électronique de Microélectronique et de Nanotechnologie)
Fytas, George (University of Crete. Department of Materials Science)

Data:	2017
Resum:	Determination of the mechanical properties of nanostructured soft materials and their composites in a quantitative manner is of great importance to improve the fidelity in their fabrication and to enable the subsequent reliable utility. Here, we report on the characterization of the elastic and photoelastic parameters of a periodic array of nanowalls (grating) by the non-invasive Brillouin light scattering technique and finite element calculations. The resolved elastic vibrational modes in high and low aspect ratio nanowalls reveal quantitative and qualitative differences related to the two-beam interference lithography fabrication and subsequent aging under ambient conditions. The phononic properties, namely the dispersion relations, can be drastically altered by changing the surrounding material of the nanowalls. Here we demonstrate that liquid infiltration turns the phononic function from a single-direction phonon-guiding to an anisotropic propagation along the two orthogonal directions. The susceptibility of the phononic behavior to the infiltrating liquid can be of unusual benefits, such as sensing and alteration of the materials under confinement.
Ajuts:	European Commission 340391 European Commission 694977 European Commission 309150 Ministerio de Economía y Competitividad FIS 2015-70862P Ministerio de Economía y Competitividad SEV-2013-0295
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Brillouin light scattering ; Dispersion relations ; Orthogonal directions ; Photoelastic parameters ; Photoresist gratings ; Qualitative differences ; Surrounding materials ; Two-beam interference
Publicat a:	Nanoscale, Vol. 9, Issue 8 (January 2017) , p. 2739-2747, ISSN 2040-3372

DOI: 10.1039/c6nr08312a

Postprint 25 p, 1.9 MB

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