Nanoscale thermal transport and phonon dynamics in ultra-thin Si based nanostructures

M R Wagner, E Chavez-Angel, J Gomis-Bresco, J S Reparaz, Andrey Shchepetov, Mika Prunnila, Jouni Ahopelto, F Alzina, C M Sotomayor-Torres

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    We study the dynamics of acoustic phonons in ultra-thin free-standing silicon membranes both experimentally and theoretically. We discuss the impact of the lifetimes of the acoustic phonons on the thermal transport properties of the membranes with thicknesses ranging from 8 nm to 1.5 µm. The phonon lifetimes are determined by measuring the dynamic variation of the reflectivity using ultra-fast pump-probe spectroscopy. This is achieved by asynchronous optical sampling (ASOPS) of two actively coupled femto-second laser oscillators. The coherent acoustic phonon lifetime is obtained from the dynamical variations of the reflectivity with a sensitivity of 10-5 and a time resolution of about 50 fs. The experimental results are compared to theoretical calculations considering both intrinsic and extrinsic relaxation scattering processes
    Original languageEnglish
    Title of host publicationProceedings
    Subtitle of host publication19th International Workshop on Thermal Investigations of ICs and Systems, THERMINIC 2013
    PublisherIEEE Institute of Electrical and Electronic Engineers
    Pages10-12
    ISBN (Electronic)978-1-4799-2272-7
    ISBN (Print)978-1-4799-2271-0
    DOIs
    Publication statusPublished - 2013
    MoE publication typeNot Eligible
    Event19th International Workshop on Thermal Investigations of ICs and Systems, THERMINIC 2013 - Berlin, Germany
    Duration: 25 Sep 201327 Sep 2013
    Conference number: 19

    Conference

    Conference19th International Workshop on Thermal Investigations of ICs and Systems, THERMINIC 2013
    Abbreviated titleTHERMINIC 2013
    CountryGermany
    CityBerlin
    Period25/09/1327/09/13

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    Cite this

    Wagner, M. R., Chavez-Angel, E., Gomis-Bresco, J., Reparaz, J. S., Shchepetov, A., Prunnila, M., Ahopelto, J., Alzina, F., & Sotomayor-Torres, C. M. (2013). Nanoscale thermal transport and phonon dynamics in ultra-thin Si based nanostructures. In Proceedings: 19th International Workshop on Thermal Investigations of ICs and Systems, THERMINIC 2013 (pp. 10-12). IEEE Institute of Electrical and Electronic Engineers . https://doi.org/10.1109/THERMINIC.2013.6675218