Scale-Dependent Heat Transport in Dissipative Media via Electromagnetic Fluctuations

Physical Review Letters, Journal Year: 2024, Volume and Issue: 132(10)

Published: March 7, 2024

We develop a theory for heat transport via electromagnetic waves inside media, and use it to derive spatially nonlocal thermal conductivity tensor, in terms of the Green's function potential, any given system. While typically negligible optically dense bulk component can be significant dilute shows regimes Fourier as well unhindered transport. Moreover, contribution is relevant even when presence interfaces, exemplified in-plane nanosheet, which variety phenomena, including absence regime.

Language: Английский

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Thermal switching performance of surface plasmon polaritons in Ag2Se quantum-Dot/Polymer composite film

International Journal of Heat and Mass Transfer, Journal Year: 2025, Volume and Issue: 244, P. 126943 - 126943

Published: March 13, 2025

Language: Английский

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Superior Thermal Dissipation Performance in Diamond on Chip Structure Established under Minor Pressure at low temperature

Surfaces and Interfaces, Journal Year: 2025, Volume and Issue: unknown, P. 106317 - 106317

Published: March 1, 2025

Language: Английский

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Tunable Thermal Conductivity of Surface Phonon Polarizations in SiC Thin Film

Physica Scripta, Journal Year: 2024, Volume and Issue: 99(10), P. 105968 - 105968

Published: Aug. 28, 2024

Abstract As an additional heat carrier besides phonons and electrons, the surface phonon polariton (SPhPs) possesses a large potential to increase thermal conductivity. In this work, influences of SPhP frequency, film thickness permittivity on SPhP-contributed conductivity SiC thin films were probed. Results show that: there are two frequency zones which could lead much high conductivity, i. e. approaching zero in singularity zone. The decreases with thickness, following power-function relationship, 10-nm have higher than 1 × 0 4 W·m −1 ·K . However, experimental observation is still difficult because size effect length. will decrease imaginary part and/or real permittivity, approximately reciprocal dependence permittivity. be tuned by several times tailoring its through adding fillers it or dopant it. This work provides some methods tune film, help application microscale dissipation.

Language: Английский

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Maximum plasmon thermal conductivity of a thin metal film

Physical review. B./Physical review. B, Journal Year: 2024, Volume and Issue: 109(16)

Published: April 8, 2024

Due to their extremely long propagation lengths compared the wavelengths, surface plasmon polaritons (SPPs) have been considered as a key in enhancing thermal conductivity thin metal films. This study explores conditions at which is maximized, considering thickness-dependent permittivity. We derived analytical solutions for both thin-film and thick-film limits analyze effect of permittivities metals substrates. From conductivity, we deduced that proportional electron based on Wiedemann-Franz law. Additionally, analyzed where enhancement ratio via SPPs maximized. Metals with high plasma frequency low damping coefficient are desirable achieving maximum well among metals. Significantly, 10-cm-long 14-nm-thick Al film demonstrates most superior in-plane heat transfer SPPs, showing 53.5% its counterpart lossless glass substrate.

Language: Английский

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