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Low-dimensional heat conduction in surface phonon polariton waveguide.

ABSTRACT: Heat conduction in solids is typically governed by the Fourier's law describing a diffusion process due to the short wavelength and mean free path for phonons and electrons. Surface phonon polaritons couple thermal photons and optical phonons at the surface of polar dielectrics, possessing much longer wavelength and propagation length, representing an excellent candidate to support extraordinary heat transfer. Here, we realize clear observation of thermal conductivity mediated by surface phonon polaritons in SiO₂ nanoribbon waveguides of 20-50 nm thick and 1-10 μm wide and also show non-Fourier behavior in over 50-100 μm distance at room and high temperature. This is enabled by rational design of the waveguide to control the mode size of the surface phonon polaritons and its efficient coupling to thermal reservoirs. Our work laid the foundation for manipulating heat conduction beyond the traditional limit via surface phonon polaritons waves in solids.

SUBMITTER: Pei Y

PROVIDER: S-EPMC10716141 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature

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Low-dimensional heat conduction in surface phonon polariton waveguide.

Pei Yu Y Chen Li L Jeon Wonjae W Liu Zhaowei Z Chen Renkun R

Nature communications 20231212 1

Heat conduction in solids is typically governed by the Fourier's law describing a diffusion process due to the short wavelength and mean free path for phonons and electrons. Surface phonon polaritons couple thermal photons and optical phonons at the surface of polar dielectrics, possessing much longer wavelength and propagation length, representing an excellent candidate to support extraordinary heat transfer. Here, we realize clear observation of thermal conductivity mediated by surface phonon ...[more]

PMID: 38086822

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