Journal
NANO LETTERS
Volume 17, Issue 7, Pages 4347-4353Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b01422
Keywords
Near-field radiative heat transfer; dynamic thermal modulator; metal-insulator transition; vanadium dioxide; uniform nanogap
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Funding
- JSPS KAKENHI [JP16K17538]
- Grants-in-Aid for Scientific Research [16K17538] Funding Source: KAKEN
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Dynamic control of electromagnetic heat transfer without changing mechanical configuration opens possibilities in intelligent thermal management in nanoscale systems. We confirmed by experiment that the radiative heat transfer is dynamically modulated beyond the blackbody limit. The near field electromagnetic heat exchange mediated by phonon-polariton is controlled by the metal insulator transition of tungsten-doped vanadium dioxide. The functionalized heat flux is transferred over an area of 1.6 cm(2) across a 370 nm gap, which is maintained by the microfabricated spacers and applied pressure. The uniformity of the gap is validated by optical interferometry, and the measured heat transfer is well modeled as the sum of the radiative and the parasitic conductive components. The presented methodology to form a nanometric gap with functional heat flux paves the way to the smart thermal management in various scenes ranging from highly integrated systems to macroscopic apparatus.
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