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Focusing surface phonon-polaritons for tunable thermal radiation
Jose Ordonez-Miranda1,2,3, Masahiro Nomura4,5, Sebastian Volz4,5
1LIMMS, CNRS-IIS IRL 2820, The University of Tokyo, Tokyo, 153-8505, Japan. jose.ordonez@cnrs.fr.
Discover Nano
|January 23, 2025
Summary
Researchers enhanced thermal radiation using silicon nitride conical membranes. This method boosts thermal conductance by 1000x the blackbody limit, offering new possibilities for nanoscale energy harvesting and thermal management.
Area of Science:
- Nanophotonics
- Thermal Engineering
- Materials Science
Background:
- Controlling thermal radiation is crucial for energy applications.
- Subwavelength structures offer pathways to manipulate heat transfer.
- Silicon nitride is a versatile material for optical and thermal applications.
Purpose of the Study:
- To demonstrate enhanced thermal radiation control using subwavelength conical membranes.
- To investigate the role of surface phonon-polaritons in thermal conductance.
- To explore the impact of conical geometry on radiative properties.
Main Methods:
- Utilized fluctuational electrodynamics to model thermal radiation.
- Simulated heat transfer through silicon nitride conical membranes.
- Analyzed the focusing of surface phonon-polaritons.
Main Results:
- Achieved a three-order-of-magnitude enhancement in thermal conductance over the blackbody limit.
- Observed a non-monotonic dependence of thermal conductance on membrane geometry.
- Identified a radiation plateau due to competing polariton focusing and radiative area effects.
Conclusions:
- Conical geometry provides unprecedented control over thermal radiation.
- The findings have significant implications for nanoscale energy harvesting.
- This work opens new avenues for advanced thermal management solutions.
