Heat guiding and focusing using ballistic phonon transport in phononic nanostructures

Nature Communications
Roman AnufrievMasahiro Nomura

Abstract

Unlike classical heat diffusion at macroscale, nanoscale heat conduction can occur without energy dissipation because phonons can ballistically travel in straight lines for hundreds of nanometres. Nevertheless, despite recent experimental evidence of such ballistic phonon transport, control over its directionality, and thus its practical use, remains a challenge, as the directions of individual phonons are chaotic. Here, we show a method to control the directionality of ballistic phonon transport using silicon membranes with arrays of holes. First, we demonstrate that the arrays of holes form fluxes of phonons oriented in the same direction. Next, we use these nanostructures as directional sources of ballistic phonons and couple the emitted phonons into nanowires. Finally, we introduce thermal lens nanostructures, in which the emitted phonons converge at the focal point, thus focusing heat into a spot of a few hundred nanometres. These results motivate the concept of ray-like heat manipulations at the nanoscale.

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Citations

Feb 1, 2018·Scientific Reports·Abhinav MalhotraMartin Maldovan
Mar 15, 2018·Scientific Reports·Jeremie MaireMasahiro Nomura
Mar 13, 2019·Nanotechnology·Marianna SledzinskaClivia M Sotomayor Torres
Jul 6, 2019·Nanoscale·Roman AnufrievMasahiro Nomura
Apr 3, 2020·Nanotechnology·Chun Yu HuangAlexander A Balandin
Feb 14, 2019·Scientific Reports·Ziqi YuJaeho Lee
May 14, 2020·Proceedings. Mathematical, Physical, and Engineering Sciences·Gaurav Maurya, Basant Lal Sharma
Aug 12, 2017·Science Advances·Jeremie MaireMasahiro Nomura
Oct 6, 2020·Physical Review Letters·Robinjeet Singh, Thomas P Purdy
Jul 8, 2020·Micromachines·Haque Mayeesha MasruraHiroshi Mizuta
Jan 17, 2021·Nanomaterials·Alexandros El SachatEmigdio Chavez-Angel
Dec 9, 2020·Entropy·Dario Tamascelli
Feb 25, 2020·Nano Letters·Daniel VakulovErik P A M Bakkers
Aug 21, 2019·Accounts of Chemical Research·Julian GargiuloEmiliano Cortés
Mar 15, 2019·ACS Applied Materials & Interfaces·Anthony GeorgeMasahiro Nomura
Jul 1, 2020·The Journal of Physical Chemistry Letters·Liyuan DongXian-He Bu

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Methods Mentioned

BETA
electron-beam lithography
scanning electron microscopy

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