The effect of echoes interference on phonon attenuation in a nanophononic membrane

Mohammad Hadi, Haoming Luo, Stéphane Pailhès, Anne Tanguy, Anthony Gravouil, Flavio Capotondi, Dario Angelis, Danny Fainozzi, Laura Foglia, Riccardo Mincigrucci, Ettore Paltanin, Emanuele Pedersoli, Jacopo S. Pelli-Cresi, Filippo Bencivenga and Valentina M. Giordano ()
Additional contact information
Mohammad Hadi: CNRS, Institut Lumière Matière
Haoming Luo: CNRS, Institut Lumière Matière
Stéphane Pailhès: CNRS, Institut Lumière Matière
Anne Tanguy: CNRS UMR5259, Université de Lyon
Anthony Gravouil: CNRS UMR5259, Université de Lyon
Flavio Capotondi: Elettra Sincrotrone Trieste S.c.P.A.
Dario Angelis: Elettra Sincrotrone Trieste S.c.P.A.
Danny Fainozzi: Elettra Sincrotrone Trieste S.c.P.A.
Laura Foglia: Elettra Sincrotrone Trieste S.c.P.A.
Riccardo Mincigrucci: Elettra Sincrotrone Trieste S.c.P.A.
Ettore Paltanin: Elettra Sincrotrone Trieste S.c.P.A.
Emanuele Pedersoli: Elettra Sincrotrone Trieste S.c.P.A.
Jacopo S. Pelli-Cresi: Elettra Sincrotrone Trieste S.c.P.A.
Filippo Bencivenga: Elettra Sincrotrone Trieste S.c.P.A.
Valentina M. Giordano: CNRS, Institut Lumière Matière

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Nanophononic materials are characterized by a periodic nanostructuration, which may lead to coherent scattering of phonons, enabling interference and resulting in modified phonon dispersions. We have used the extreme ultraviolet transient grating technique to measure phonon frequencies and lifetimes in a low-roughness nanoporous phononic membrane of SiN at wavelengths between 50 and 100 nm, comparable to the nanostructure lengthscale. Surprisingly, phonon frequencies are only slightly modified upon nanostructuration, while phonon lifetime is strongly reduced. Finite element calculations indicate that this is due to coherent phonon interference, which becomes dominant for wavelengths between ~ half and twice the inter-pores distance. Despite this, vibrational energy transport is ensured through an energy flow among the coherent modes created by reflections. This interference of phonon echos from periodic interfaces is likely another aspect of the mutual coherence effects recently highlighted in amorphous and complex crystalline materials and, in this context, could be used to tailor transport properties of nanostructured materials.

Date: 2024
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DOI: 10.1038/s41467-024-45571-x

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