Lifetimes of confined acoustic phonons in ultrathin silicon membranes

J. Cuffe, O. Ristow, E. Chávez, Andrey Shchepetov, P.-O. Chapuis, F. Alzina, M. Hettich, Mika Prunnila, Jouni Ahopelto, T. Dekorsy, C.M. Sotomayor Torres (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

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    Abstract

    We study the relaxation of coherent acoustic phonon modes with frequencies up to 500 GHz in ultrathin free-standing silicon membranes. Using an ultrafast pump-probe technique of asynchronous optical sampling, we observe that the decay time of the first-order dilatational mode decreases significantly from ∼4.7  ns to 5 ps with decreasing membrane thickness from ∼194 to 8 nm. The experimental results are compared with theories considering both intrinsic phonon-phonon interactions and extrinsic surface roughness scattering including a wavelength-dependent specularity. Our results provide insight to understand some of the limits of nanomechanical resonators and thermal transport in nanostructures.
    Original languageEnglish
    Article number095503
    Number of pages5
    JournalPhysical Review Letters
    Volume110
    Issue number9
    DOIs
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    phonons
    membranes
    life (durability)
    acoustics
    silicon
    surface roughness
    resonators
    sampling
    pumps
    probes
    decay
    scattering
    wavelengths
    interactions

    Cite this

    Cuffe, J., Ristow, O., Chávez, E., Shchepetov, A., Chapuis, P-O., Alzina, F., ... Sotomayor Torres, C. M. (2013). Lifetimes of confined acoustic phonons in ultrathin silicon membranes. Physical Review Letters, 110(9), [095503]. https://doi.org/10.1103/PhysRevLett.110.095503
    Cuffe, J. ; Ristow, O. ; Chávez, E. ; Shchepetov, Andrey ; Chapuis, P.-O. ; Alzina, F. ; Hettich, M. ; Prunnila, Mika ; Ahopelto, Jouni ; Dekorsy, T. ; Sotomayor Torres, C.M. / Lifetimes of confined acoustic phonons in ultrathin silicon membranes. In: Physical Review Letters. 2013 ; Vol. 110, No. 9.
    @article{79bf27a3bd674798af63bf6d42be6995,
    title = "Lifetimes of confined acoustic phonons in ultrathin silicon membranes",
    abstract = "We study the relaxation of coherent acoustic phonon modes with frequencies up to 500 GHz in ultrathin free-standing silicon membranes. Using an ultrafast pump-probe technique of asynchronous optical sampling, we observe that the decay time of the first-order dilatational mode decreases significantly from ∼4.7  ns to 5 ps with decreasing membrane thickness from ∼194 to 8 nm. The experimental results are compared with theories considering both intrinsic phonon-phonon interactions and extrinsic surface roughness scattering including a wavelength-dependent specularity. Our results provide insight to understand some of the limits of nanomechanical resonators and thermal transport in nanostructures.",
    author = "J. Cuffe and O. Ristow and E. Ch{\'a}vez and Andrey Shchepetov and P.-O. Chapuis and F. Alzina and M. Hettich and Mika Prunnila and Jouni Ahopelto and T. Dekorsy and {Sotomayor Torres}, C.M.",
    year = "2013",
    doi = "10.1103/PhysRevLett.110.095503",
    language = "English",
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    Cuffe, J, Ristow, O, Chávez, E, Shchepetov, A, Chapuis, P-O, Alzina, F, Hettich, M, Prunnila, M, Ahopelto, J, Dekorsy, T & Sotomayor Torres, CM 2013, 'Lifetimes of confined acoustic phonons in ultrathin silicon membranes', Physical Review Letters, vol. 110, no. 9, 095503. https://doi.org/10.1103/PhysRevLett.110.095503

    Lifetimes of confined acoustic phonons in ultrathin silicon membranes. / Cuffe, J.; Ristow, O.; Chávez, E.; Shchepetov, Andrey; Chapuis, P.-O.; Alzina, F.; Hettich, M.; Prunnila, Mika; Ahopelto, Jouni; Dekorsy, T.; Sotomayor Torres, C.M. (Corresponding Author).

    In: Physical Review Letters, Vol. 110, No. 9, 095503, 2013.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Lifetimes of confined acoustic phonons in ultrathin silicon membranes

    AU - Cuffe, J.

    AU - Ristow, O.

    AU - Chávez, E.

    AU - Shchepetov, Andrey

    AU - Chapuis, P.-O.

    AU - Alzina, F.

    AU - Hettich, M.

    AU - Prunnila, Mika

    AU - Ahopelto, Jouni

    AU - Dekorsy, T.

    AU - Sotomayor Torres, C.M.

    PY - 2013

    Y1 - 2013

    N2 - We study the relaxation of coherent acoustic phonon modes with frequencies up to 500 GHz in ultrathin free-standing silicon membranes. Using an ultrafast pump-probe technique of asynchronous optical sampling, we observe that the decay time of the first-order dilatational mode decreases significantly from ∼4.7  ns to 5 ps with decreasing membrane thickness from ∼194 to 8 nm. The experimental results are compared with theories considering both intrinsic phonon-phonon interactions and extrinsic surface roughness scattering including a wavelength-dependent specularity. Our results provide insight to understand some of the limits of nanomechanical resonators and thermal transport in nanostructures.

    AB - We study the relaxation of coherent acoustic phonon modes with frequencies up to 500 GHz in ultrathin free-standing silicon membranes. Using an ultrafast pump-probe technique of asynchronous optical sampling, we observe that the decay time of the first-order dilatational mode decreases significantly from ∼4.7  ns to 5 ps with decreasing membrane thickness from ∼194 to 8 nm. The experimental results are compared with theories considering both intrinsic phonon-phonon interactions and extrinsic surface roughness scattering including a wavelength-dependent specularity. Our results provide insight to understand some of the limits of nanomechanical resonators and thermal transport in nanostructures.

    U2 - 10.1103/PhysRevLett.110.095503

    DO - 10.1103/PhysRevLett.110.095503

    M3 - Article

    VL - 110

    JO - Physical Review Letters

    JF - Physical Review Letters

    SN - 0031-9007

    IS - 9

    M1 - 095503

    ER -

    Cuffe J, Ristow O, Chávez E, Shchepetov A, Chapuis P-O, Alzina F et al. Lifetimes of confined acoustic phonons in ultrathin silicon membranes. Physical Review Letters. 2013;110(9). 095503. https://doi.org/10.1103/PhysRevLett.110.095503