Directional elastic wave propagation in high-aspect-ratio photoresist gratings: liquid infiltration and aging
Year: 2017
Type: article
Abstract: 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.
Source: Nanoscale
DOI: 10.1039/c6nr08312a
Institutions: Max Planck Institute for Polymer Research, Centre National de la Recherche Scientifique, Institut d'Electronique, de Microélectronique et de Nanotechnologie, University of Pennsylvania, Consejo Superior de Investigaciones Científicas, Institut Català de Nanociència i Nanotecnologia, Barcelona Institute of Science and Technology, Institució Catalana de Recerca i Estudis Avançats, University of Crete, FORTH Institute of Electronic Structure and Laser, Foundation for Research and Technology Hellas
Language: English
Subfield: Acoustics and Ultrasonics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: Alexander von Humboldt-Stiftung
OpenAlex ID: W2561338435