Transient measurement of near-field thermal radiation between macroscopic objects

Zhang, Sen; Dang, Yongdi; Li, Xinran; Li, Yuxuan; Jin, Yi; Choudhury, Pankaj K.; Xu, Jianbing; Ma, Yungui

doi:10.1039/d3nr04938h

Electromagnetic Materials

Choudhury

2024

Encyclopedia of RF and Microwave Engineering

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This article describes the electromagnetic properties of certain types of mediums or materials in which the process of electromagnetics takes place. The introductory part discusses the evolution of electromagnetics based on theories and experiments by the pioneering scientists in the past. The following portions of the article deal with the different types of mediums, including isotropic and anisotropic dielectrics, conductors, semiconductors, superconductors, electrooptic, and optically active mediums. The fundamentals of magnetic materials are described in greater detail, explaining the mechanisms of magnetization and special materials such as ferrites. Bianisotropic materials and their constitutive equations are also discussed. Here, the focus is on some of the fundamental aspects of the constitutive characterization of bianisotropic mediums. The last three sections describe the basics and important applications of the phenomena of magnetostriction, piezoelectricity, and metamaterials.

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Electromagnetic Materials

Choudhury

2024

Encyclopedia of RF and Microwave Engineering

0

View full text Add to dashboard Cite

This article describes the electromagnetic properties of certain types of mediums or materials in which the process of electromagnetics takes place. The introductory part discusses the evolution of electromagnetics based on theories and experiments by the pioneering scientists in the past. The following portions of the article deal with the different types of mediums, including isotropic and anisotropic dielectrics, conductors, semiconductors, superconductors, electrooptic, and optically active mediums. The fundamentals of magnetic materials are described in greater detail, explaining the mechanisms of magnetization and special materials such as ferrites. Bianisotropic materials and their constitutive equations are also discussed. Here, the focus is on some of the fundamental aspects of the constitutive characterization of bianisotropic mediums. The last three sections describe the basics and important applications of the phenomena of magnetostriction, piezoelectricity, and metamaterials.

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Observation of enhanced heat transfer between a nanotip and substrate at nanoscale distances via direct temperature probing with Raman spectroscopy

Huang,

Sun,

Xu

et al. 2024

Applied Physics Letters

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Nanoscale heat transfer between two nanostructured surfaces holds paramount significance in the realms of extreme manufacturing and high-density data storage. However, experimental probing of heat transfer encounters significant challenges, primarily due to limitations in current instrumentation. Here, we report a method based on Raman spectroscopy to directly probe the temperature difference between a Si nanotip and SiC substrate. Results indicate a decrease in substrate temperature, while the temperature of the nanotip remains relatively stable as the nanotip moves away from the substrate from approximately 82.5 to 1320 nm. We trace this enhanced heat transfer to a significant augmentation, by one order of magnitude, in air conduction and thermal radiation energy exchange theoretically, with air conduction being the dominant mode over thermal radiation. This work advances the direct observation of surface temperatures with gaps smaller than 1 μm, utilizing a noncontact and nondestructive Raman technique, which can be extended to studying near-field heat transfer across various Raman-active surfaces.

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Transient measurement of near-field thermal radiation between macroscopic objects

Abstract: Utilizing the first law of thermodynamics, a transient all-optical method is proposed to quickly characterize near-field radiative heat transfer (NFRHT) between macroscopic objects of different material systems.

Cited by 4 publications

References 55 publications

Electromagnetic Materials

Electromagnetic Materials

Electromagnetic Materials

Observation of enhanced heat transfer between a nanotip and substrate at nanoscale distances via direct temperature probing with Raman spectroscopy

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