Quasiballistic Thermal Transport from Nanoscale Heaters and the Role of the Spatial Frequency

被引：14

作者：

Chen, Xiangwen ^{[1
]}

Hua, Chengyun ^{[2
]}

Zhang, Hang ^{[3
]}

Ravichandran, Navaneetha K. ^{[4
]}

Minnich, Austin J. ^{[1
]}

机构：

[1] CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA

[2] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[3] Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China

[4] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

来源：

PHYSICAL REVIEW APPLIED | 2018年 / 10卷 / 05期

基金：

美国国家科学基金会;

关键词：

THERMOELECTRICS; CONDUCTIVITY; PERFORMANCE; DISSIPATION;

D O I：

10.1103/PhysRevApplied.10.054068

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Quasiballistic heat conduction from nanoscale heat sources of size comparable to phonon mean free paths has recently become of intense interest both scientifically and for its applications. Prior work has established that, in the quasiballistic regime, the apparent thermal properties of materials depend both on intrinsic mechanisms and the characteristics of the applied thermal gradient. However, many aspects of this regime remain poorly understood. Here, we experimentally study the thermal response of crystals to large thermal gradients generated by optical heating of nanoline arrays. Our experiments reveal the key role of the spatial frequencies and Fourier series amplitudes of the heating profile for thermal transport in the quasiballistic regime, in contrast to the conventional picture that focuses on the geometric dimensions of the individual heaters. Our work provides the insight needed to rationally mitigate local hot spots in modern applications by manipulating the spatial frequencies of the heater patterns.

引用

页数：11

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