Controlling thermal conductance using three-dimensional phononic crystals
Heiskanen, S., Puurtinen, T. A., & Maasilta, I. J. (2021). Controlling thermal conductance using three-dimensional phononic crystals. APL Materials, 9(8), Article 081108. https://doi.org/10.1063/5.0057385
Published inAPL Materials
© 2021 the Authors
Controlling thermal transport at the nanoscale is vital for many applications. Previously, it has been shown that this control can be achieved with periodically nanostructured two-dimensional phononic crystals for the case of suspended devices. Here, we show that thermal conductance can also be controlled with three-dimensional phononic crystals, allowing the engineering of the thermal contact of more varied devices without the need for suspension in the future. We show the experimental results obtained at sub-Kelvin temperatures for two different period three-dimensional crystals and for a bulk control structure. The results show that the conductance can be enhanced with the phononic crystal structures in our geometry. This result cannot be fully explained by the simplest theory taking into account the coherent modification of the phonon band structure, calculated by finite element method simulations.
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Related funder(s)Academy of Finland
Funding program(s)Academy Project, AoF
Additional information about fundingThis study was supported by the Academy of Finland (Project Nos. 298667 and 341823).
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