Measurement of quasi-ballistic heat transport across nanoscale interfaces using ultrafast coherent soft x-ray beams [electronic resource].

Published:: Berkeley, Calif. : Lawrence Berkeley National Laboratory, 2009.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: 16 : digital, PDF file
Additional Creators:: Lawrence Berkeley National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information

Access Online

www.osti.gov

Availability

Finding items...

Restrictions on Access:

Free-to-read Unrestricted online access

Summary:

Understanding heat transport on nanoscale dimensions is important for fundamental advances in nanoscience, as well as for practical applications such as thermal management in nano-electronics, thermoelectric devices, photovoltaics, nanomanufacturing, as well as nanoparticle thermal therapy. Here we report the first time-resolved measurements of heat transport across nanostructured interfaces. We observe the transition from a diffusive to a ballistic thermal transport regime, with a corresponding increase in the interface resistivity for line widths smaller than the phonon mean free path in the substrate. Resistivities more than three times higher than the bulk value are measured for the smallest line widths of 65 nm. Our findings are relevant to the modeling and design of heat transport in nanoscale engineered systems, including nanoelectronics, photovoltaics and thermoelectric devices.

Report Numbers:

E 1.99:lbnl-1605e
lbnl-1605e

Other Subject(s):

Note:

Published through SciTech Connect.
03/02/2009.
"lbnl-1605e"
Science ISSN 0193-4511; SCEHDK FT
Anderson, E.; Nelson, K.; Li, Q.; Kapteyn, H.; Murnane, M.; Yang, R.; Siemens, M.
Materials Sciences Division

Funding Information:

DE-AC02-05CH11231

View MARC record | catkey: 14445034