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Colossal Near-Field Radiative Heat Transfer Mediated by Coupled Polaritons with an Ultrahigh Dynamic Range.

Wenbin Zhang1, Boxiang Wang1,2, Shenghao Jin1

  • 1Institute of Engineering Thermophysics, School of Mechanical Engineering, MOE Key Laboratory for Power Machinery and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.

Advanced Materials (Deerfield Beach, Fla.)
|July 31, 2024
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Summary

This study experimentally demonstrates that coupled polaritons significantly enhance near-field radiative heat transfer (NFRHT), exceeding the blackbody limit by over 300-fold. Dynamic control of NFRHT was achieved using bias voltage, opening avenues for thermal computing.

Keywords:
dynamic regulationnear‐field radiative heat transferstrong coupling effectsurface polaritons

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Area of Science:

  • Condensed Matter Physics
  • Nanoscale Heat Transfer
  • Quantum Electrodynamics

Background:

  • Near-field radiative heat transfer (NFRHT) can surpass blackbody limits due to evanescent waves.
  • Coupled polaritons are theoretically predicted to dramatically enhance NFRHT.
  • Experimental verification of polariton-mediated NFRHT enhancement is lacking.

Purpose of the Study:

  • To experimentally demonstrate and quantify the enhancement of NFRHT mediated by coupled polaritons.
  • To investigate the dynamic tunability of NFRHT in such systems.
  • To provide experimental evidence for coupled polaritonic effects in NFRHT.

Main Methods:

  • Fabrication of millimeter-size graphene/SiC/SiO2 composite devices in a planar configuration.
  • Measurement of NFRHT at nanoscale gaps (87 nm).
  • Utilized scattering-type scanning near-field optical microscopy (s-SNOM) and full-wave numerical simulations.

Main Results:

  • Achieved a 302.8 ± 35.2-fold enhancement of NFRHT over the blackbody limit.
  • Reached record radiative thermal conductance (0.136 WK⁻¹) and effective gap heat transfer coefficient (5440 Wm⁻²K⁻¹).
  • Demonstrated dynamic regulation of NFRHT with a bias voltage, achieving a dynamic range of ≈4.115.

Conclusions:

  • Coupled polaritons play a crucial role in significantly enhancing NFRHT.
  • The demonstrated dynamic control of NFRHT opens possibilities for advanced thermal management.
  • This work paves the way for applications in nanoscale heat transport, energy conversion, and thermal computing.