Heat conduction engineering in pillar-based phononic crystals
Heat conduction engineering in pillar-based phononic crystals
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DOI：
10.1103/physrevb.95.155432
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发表时间：
2017-04-20
影响因子：
3.7
通讯作者：
Nomura, Masahiro
中科院分区：
文献类型：
--
作者：
Anufriev, Roman;Nomura, Masahiro
柱状声子晶体是一类基于结构设计可以控制热传导的声学超材料。在这项工作中，我们系统地研究了柱基声子晶体的各种参数如何影响低温下的导热性。我们发现，当柱体较短、半径较大、周期较长且材料局部共振较少时，热导率最低，而局部共振较多的柱体反而会增加热导率。我们认为，适当设计的基于柱的声子晶体可以作为传统基于孔的声子晶体的替代品，因为柱中的局部共振引入了额外的自由度，这不仅可以抑制热传导，还可以增强热传导。此外，我们提出了基于孔/柱的混合声子晶体，可以进一步降低热导率。
Pillar-based phononic crystals belong to a class of acoustic metamaterials that can control heat conduction based on the design of the structure. In this work, we systematically investigate how various parameters of pillar-based phononic crystals affect thermal conductance at low temperatures. We find that the lowest thermal conductance is achieved when the pillars are short, have a large radius, a long period, and are made of materials with few local resonances, whereas pillars with many local resonances can, on the contrary, increase thermal conductance. We argue that properly designed pillar-based phononic crystals can serve as an alternative to conventional hole-based phononic crystals because local resonances in pillars introduce additional degrees of freedom, which allows not only suppressing but also enhancing heat conduction. Moreover, we propose hybrid hole/pillar-based phononic crystals that can further reduce thermal conductance.