Lifetimes of Confined Acoustic Phonons in Ultrathin Silicon Membranes
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...
| Main Authors: | , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Physical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/78653 |
| _version_ | 1811073770833575936 |
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| author | Cuffe, John Ristow, O. Chavez, E. Shchepetov, A. Chapuis, P. O. Alzina, F. Hettich, M. Prunnila, M. Ahopelto, Jouni Dekorsy, T. Torres, C. M. Sotomayor |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Cuffe, John Ristow, O. Chavez, E. Shchepetov, A. Chapuis, P. O. Alzina, F. Hettich, M. Prunnila, M. Ahopelto, Jouni Dekorsy, T. Torres, C. M. Sotomayor |
| author_sort | Cuffe, John |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T09:38:20Z |
| format | Article |
| id | mit-1721.1/78653 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T09:38:20Z |
| publishDate | 2013 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/786532022-09-26T12:47:40Z Lifetimes of Confined Acoustic Phonons in Ultrathin Silicon Membranes Cuffe, John Ristow, O. Chavez, E. Shchepetov, A. Chapuis, P. O. Alzina, F. Hettich, M. Prunnila, M. Ahopelto, Jouni Dekorsy, T. Torres, C. M. Sotomayor Massachusetts Institute of Technology. Department of Mechanical Engineering Cuffe, John 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. 2013-05-01T17:04:48Z 2013-05-01T17:04:48Z 2013-02 2012-08 Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/78653 Cuffe, J. et al. “Lifetimes of Confined Acoustic Phonons in Ultrathin Silicon Membranes.” Physical Review Letters 110.9 (2013). ©2013 American Physical Society en_US http://dx.doi.org/10.1103/PhysRevLett.110.095503 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Cuffe, John Ristow, O. Chavez, E. Shchepetov, A. Chapuis, P. O. Alzina, F. Hettich, M. Prunnila, M. Ahopelto, Jouni Dekorsy, T. Torres, C. M. Sotomayor Lifetimes of Confined Acoustic Phonons in Ultrathin Silicon Membranes |
| title | Lifetimes of Confined Acoustic Phonons in Ultrathin Silicon Membranes |
| title_full | Lifetimes of Confined Acoustic Phonons in Ultrathin Silicon Membranes |
| title_fullStr | Lifetimes of Confined Acoustic Phonons in Ultrathin Silicon Membranes |
| title_full_unstemmed | Lifetimes of Confined Acoustic Phonons in Ultrathin Silicon Membranes |
| title_short | Lifetimes of Confined Acoustic Phonons in Ultrathin Silicon Membranes |
| title_sort | lifetimes of confined acoustic phonons in ultrathin silicon membranes |
| url | http://hdl.handle.net/1721.1/78653 |
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