Sub-picowatt/kelvin resistive thermometry for probing nanoscale thermal transport.
Sub-picowatt/kelvin resistive thermometry for probing nanoscale thermal transport.
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DOI：
10.1063/1.4826493
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发表时间：
2013-11
期刊：
影响因子：
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通讯作者：
Jianlin Zheng;M. Wingert;Edward Dechaumphai;Renkun Chen
中科院分区：
文献类型：
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作者：
Jianlin Zheng;M. Wingert;Edward Dechaumphai;Renkun Chen
先进的测温仪器是从实验上探索基础热传递物理的关键。然而，同时具有高测温分辨率和低寄生热传导的仪器至今仍不可用。本文报道了一种温度分辨率为50μK、热导分辨率为0.25pW/K的电阻测温方案，该方案采用了调制加热和共模噪声抑制相结合的方案。这里使用的悬浮装置被特别设计为具有与调制的加热电流相关的较短的热时间常数和最小的衰减效应。此外，我们还系统地表征了寄生背景热导，结果表明，使用新的器件设计可以显著降低寄生背景热导，并且可以使用“抵消”方案有效地消除寄生背景热导。我们的结果为使用基于电阻测温的一般方案来探测基本的纳米尺度的热传输过程铺平了道路。
Advanced instrumentation in thermometry holds the key for experimentally probing fundamental heat transfer physics. However, instrumentation with simultaneously high thermometry resolution and low parasitic heat conduction is still not available today. Here we report a resistive thermometry scheme with ~50 μK temperature resolution and ~0.25 pW/K thermal conductance resolution, which is achieved through schemes using both modulated heating and common mode noise rejection. The suspended devices used herein have been specifically designed to possess short thermal time constants and minimal attenuation effects associated with the modulated heating current. Furthermore, we have systematically characterized the parasitic background heat conductance, which is shown to be significantly reduced using the new device design and can be effectively eliminated using a "canceling" scheme. Our results pave the way for probing fundamental nanoscale thermal transport processes using a general scheme based on resistive thermometry.