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

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Alaie S,Goettler DF,Su M,Leseman ZC,Reinke CM,El-Kady I

doi

10.1038/ncomms8228

subject

Has Abstract

pub_date

2015-06-24 00:00:00

pages

7228

issn

2041-1723

pii

ncomms8228

journal_volume

6

pub_type

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