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首页> 外文期刊>Review of Scientific Instruments >Examining thermal transport through a frequency-domain representation of time-domain thermoreflectance data
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Examining thermal transport through a frequency-domain representation of time-domain thermoreflectance data

机译：通过时域热反射数据的频域表示检查热传输

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摘要

Laser-based time-domain thermoreflectance (TDTR) and frequency-domain thermoreflectance (FDTR) techniques are widely used for investigating thermal transport at micro- and nano-scales. We demonstrate that data obtained in TDTR measurements can be represented in a frequency-domain form equivalent to FDTR, i.e., in the form of a surface temperature amplitude and phase response to time-harmonic heating. Such a representation is made possible by using a large TDTR delay time window covering the entire pulse repetition interval. We demonstrate the extraction of frequency-domain data up to 1 GHz from TDTR measurements on a sapphire sample coated with a thin layer of aluminum, and show that the frequency dependencies of both the amplitude and phase responses agree well with theory. The proposed method not only allows a direct comparison of TDTR and FDTR data, but also enables measurements at high frequencies currently not accessible to FDTR. The frequency-domain representation helps uncover aspects of the measurement physics which remain obscured in a traditional TDTR measurement, such as the importance of modeling the details of the heat transport in the metal transducer film for analyzing high frequency responses.
机译：基于激光的时域热反射（TDTR）和频域热反射（FDTR）技术被广泛用于研究微米级和纳米级的热传输。我们证明了在TDTR测量中获得的数据可以以与FDTR等效的频域形式表示，即以表面温度幅度和对时间谐波加热的相位响应的形式表示。通过使用覆盖整个脉冲重复间隔的大TDTR延迟时间窗口，可以实现这种表示。我们演示了在涂有铝薄层的蓝宝石样品上从TDTR测量中提取高达1 GHz的频域数据，并表明幅度和相位响应的频率相关性与理论非常吻合。所提出的方法不仅可以直接比较TDTR和FDTR数据，还可以在FDTR当前无法访问的高频下进行测量。频域表示有助于揭示传统TDTR测量中仍然模糊的测量物理方面，例如，对金属换能器薄膜中的热传输细节进行建模以分析高频响应的重要性。

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