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Area of Science:

  • Condensed Matter Physics
  • Nanophotonics
  • Thermal Engineering

Background:

  • Far-field thermal radiation is crucial for energy transfer and thermal management.
  • Controlling thermal radiation at the nanoscale is challenging but offers significant potential.
  • Surface phonon polaritons enable manipulation of thermal radiation.

Purpose of the Study:

  • To experimentally demonstrate enhanced far-field thermal radiation between silicon microplates.
  • To investigate the role of silicon dioxide nanolayers in enhancing thermal radiation.
  • To understand the underlying physics of polariton hybridization for improved thermal conductance.

Main Methods:

  • Fabrication of nonabsorbent silicon microplates coated with silicon dioxide nanolayers.
  • Measurement of radiative thermal conductance between coated and uncoated microplates.
  • Theoretical analysis using fluctuational electrodynamics and a polariton states model.

Main Results:

  • A twofold enhancement in radiative thermal conductance was observed with silicon dioxide coatings.
  • The enhancement is attributed to the hybridization of surface phonon polaritons with guided modes in silicon.
  • Experimental results were accurately predicted by theoretical models.

Conclusions:

  • Silicon dioxide nanolayers effectively enhance far-field thermal radiation via surface phonon polaritons.
  • This enhancement mechanism offers a promising route for advanced thermal management solutions.
  • The findings have implications for microelectronics, silicon photonics, and energy conversion.