Near-field heat transfer refers to the enhanced thermal energy exchange between two objects separated by subwavelength gaps, where the dominant mechanisms of heat transfer differ fundamentally from those in the far-field (Liu et al., Nanoscale and Nanoscale Microscale Thermophys Eng. 19:98–126, 2015). This chapter focuses on Raman-based characterization of near-field thermal transport. Section 9.1 provides an introduction to the principles and significance of near-field heat transfer. Section 9.2 outlines the experimental challenges and limitations associated with thermal measurements in the near-field regime. Section 9.3 discusses the implementation of Raman thermometry for probing near-field heat transfer. Section 9.4 examines heat transfer between a nanotip and a substrate, highlighting the heat transfer enhancement in tip-substrate system. Section 9.5 considers the influence of air molecules on heat conduction in the near-field, emphasizing the complex interplay between gaseous and radiative contributions at the nanoscale. Together, these discussions demonstrate the potential of Raman thermometry as an effective tool for investigating near-field thermal phenomena and guiding the design of nanoscale thermal devices.

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Raman Characterization of Near-field Heat Transfer

  • Yanan Yue

摘要

Near-field heat transfer refers to the enhanced thermal energy exchange between two objects separated by subwavelength gaps, where the dominant mechanisms of heat transfer differ fundamentally from those in the far-field (Liu et al., Nanoscale and Nanoscale Microscale Thermophys Eng. 19:98–126, 2015). This chapter focuses on Raman-based characterization of near-field thermal transport. Section 9.1 provides an introduction to the principles and significance of near-field heat transfer. Section 9.2 outlines the experimental challenges and limitations associated with thermal measurements in the near-field regime. Section 9.3 discusses the implementation of Raman thermometry for probing near-field heat transfer. Section 9.4 examines heat transfer between a nanotip and a substrate, highlighting the heat transfer enhancement in tip-substrate system. Section 9.5 considers the influence of air molecules on heat conduction in the near-field, emphasizing the complex interplay between gaseous and radiative contributions at the nanoscale. Together, these discussions demonstrate the potential of Raman thermometry as an effective tool for investigating near-field thermal phenomena and guiding the design of nanoscale thermal devices.