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Time-modulated near-field radiative heat transfer

Yu, Renwen, Fan, Shanhui·2024·Proceedings of the National Academy of Sciences
DOI 10.1073/pnas.2401514121PMC PMC11046637
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Abstract

Near-field radiative heat transfer has recently attracted increasing interests for its applications in energy technologies, such as thermophotovoltaics. Existing works, however, are restricted to time-independent systems. Here, we explore near-field radiative heat transfer between two bodies under time modulation by developing a rigorous fluctuational electrodynamics formalism. We demonstrate that time modulation can result in the enhancement, suppression, elimination, or reversal of radiative heat flow between the two bodies, and can be used to create a radiative thermal diode with an infinite contrast ratio, as well as a near-field radiative heat engine that pumps heat from the cold to the hot bodies. The formalism reveals a fundamental symmetry relation in the radiative heat transfer coefficients that underlies these effects. Our results indicate the significant capabilities of time modulation for managing nanoscale radiative heat flow.

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  • The utilization of emerging systems such as phase-change materials, two-dimensional materials (such as graphene, hexagonal boron nitride), and metamaterials facilitates dynamic regulation of material emissivity under external stimulant (such as temperature changes, electric field control) at cryogenic temperatures.

    “The utilization of emerging systems, such as phase-change materials, two-dimensional materials (such as graphene, hexagonal boron nitride), and metamaterials, facilitates dynamic regulation of material emissivity under external stimulant (such as temperature changes, electric field control) at cryogenic temperatures.”

    From Thermal Radiation Testing Methods at Cryogenic Temperatures: A Review (2026) · cites this paper as [64]

    The Discussion and Conclusion (page unavailable) says electro-optical time modulation can be used to regulate near-field radiative heat flow. It does not establish that the listed material classes dynamically regulate emissivity at cryogenic temperatures; it instead describes radiation sourced around ambient conditions. References to graphene, hBN, metamaterials, and phase-change materials do not establish that more specific claim. (LLM, conf=0.82)

    Experimental — accuracy not yet measured

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Metadata

Authors
Yu, R., & Fan, S.
Affiliations
Department of Electrical Engineering, Ginzton Laboratory, Stanford University, Stanford, CA 94305
ORCID
Yu, Renwen
Venue
Proceedings of the National Academy of Sciences
Publisher
National Academy of Sciences
Published
2024-04-19
Volume
121
Issue
17
ISSN
  • 0027-8424
  • 1091-6490
DOI
10.1073/pnas.2401514121
PMC
PMC11046637
Cited by
35
References
0
Language
en
Licence
creativecommons.org/licenses/by-nc-nd/4.0/ (vor)
Funders
DOD | USA | AFC | CCDC | Army Research Office (W911NF-19-1-0279)

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