Thermal transport in phononic crystals and the observation of coherent phonon scattering at room temperature

Seyedhamidreza Alaie, Drew F. Goettler, Mehmet Su, Zayd C. Leseman, Charles M. Reinke and Ihab El-Kady ()
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Seyedhamidreza Alaie: University of New Mexico
Drew F. Goettler: University of New Mexico
Mehmet Su: University of New Mexico
Zayd C. Leseman: University of New Mexico
Charles M. Reinke: University of New Mexico
Ihab El-Kady: University of New Mexico

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Large reductions in the thermal conductivity of thin silicon membranes have been demonstrated in various porous structures. However, the role of coherent boundary scattering in such structures has become a matter of some debate. Here we report on the first experimental observation of coherent phonon boundary scattering at room temperature in 2D phononic crystals formed by the introduction of air holes in a silicon matrix with minimum feature sizes >100 nm. To delaminate incoherent from coherent boundary scattering, phononic crystals with a fixed minimum feature size, differing only in unit cell geometry, were fabricated. A suspended island technique was used to measure the thermal conductivity. We introduce a hybrid thermal conductivity model that accounts for partially coherent and partially incoherent phonon boundary scattering. We observe excellent agreement between this model and experimental data, and the results suggest that significant room temperature coherent phonon boundary scattering occurs.

Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8228

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DOI: 10.1038/ncomms8228

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