Fundamental Efficiency of Nanothermophones: Modeling and Experiments

被引：97

作者：

Vesterinen, V. ^{[1
]}

Niskanen, A. O. ^{[1
]}

Hassel, J. ^{[1
]}

Helisto, P. ^{[1
]}

机构：

[1] VTT Tech Res Ctr Finland, Espoo 02044, Finland

来源：

NANO LETTERS | 2010年 / 10卷 / 12期

基金：

芬兰科学院;

关键词：

Thermoacoustic; sound generation; suspended metal wire; frequency response; acoustic efficiency; ultrasound;

D O I：

10.1021/nl1031869

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Scaling down the dimensions of thermoacoustic sound sources (thermophones) Improves efficiency by means of reducing speaker heat capacity. Recent experiments with nanoscale thermophones have revealed properties which are not fully understood theoretically. We develop a Green's function formalism which quantitatively explains some observed discrepancies, e.g., the effect of a heat-absorbing substrate in the proximity of the sound source. We also find a generic ultimate limit for thermophone efficiency. We verify the theory with experiments and finite difference method simulations which deal with thermoacoustically operated suspended arrays of nanowires. The efficiency of our devices is measured to be I order of magnitude below the ultimate bound. At low frequencies this mainly results from the presence of a substrate. At high frequencies, on the other hand, the efficiency is limited by the heat capacity of the nanowires. Measured sound pressure level and efficiency are in good agreement with simulations. We discuss the feasibility of reaching the ultimate limit in practice.

引用

页码：5020 / 5024

页数：5

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