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 language | English |
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Title of host publication | 19th International Workshop on Thermal Investigations of ICs and Systems, THERMINIC 2013 |
Publisher | IEEE Institute of Electrical and Electronic Engineers |
Pages | 10-12 |
ISBN (Electronic) | 978-1-4799-2272-7 |
ISBN (Print) | 978-1-4799-2271-0 |
DOIs | |
Publication status | Published - 2013 |
MoE publication type | A4 Article in a conference publication |
Event | 19th International Workshop on Thermal Investigations of ICs and Systems, THERMINIC 2013 - Berlin, Germany Duration: 25 Sept 2013 → 27 Sept 2013 Conference number: 19 |
Conference
Conference | 19th International Workshop on Thermal Investigations of ICs and Systems, THERMINIC 2013 |
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Abbreviated title | THERMINIC 2013 |
Country/Territory | Germany |
City | Berlin |
Period | 25/09/13 → 27/09/13 |