Precision Measurement of Phonon-Polaritonic Near-Field Energy Transfer between Macroscale Planar Structures Under Large Thermal Gradients

Physical Review Letters
Mohammad GhashamiKeunhan Park

Abstract

Despite its strong potentials in emerging energy applications, near-field thermal radiation between large planar structures has not been fully explored in experiments. Particularly, it is extremely challenging to control a subwavelength gap distance with good parallelism under large thermal gradients. This article reports the precision measurement of near-field radiative energy transfer between two macroscale single-crystalline quartz plates that support surface phonon polaritons. Our measurement scheme allows the precise control of a gap distance down to 200 nm in a highly reproducible manner for a surface area of 5×5  mm^{2}. We have measured near-field thermal radiation as a function of the gap distance for a broad range of thermal gradients up to ∼156  K, observing more than 40 times enhancement of thermal radiation compared to the blackbody limit. By comparing with theoretical prediction based on fluctuational electrodynamics, we demonstrate that such remarkable enhancement is owing to phonon-polaritonic energy transfer across a nanoscale vacuum gap.

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Citations

Jul 3, 2019·Nature Nanotechnology·John DeSutterMathieu Francoeur
May 23, 2020·Nature Communications·Gaurang R BhattMichal Lipson
Jan 4, 2019·Nature Communications·F J Alfaro-MozazA Y Nikitin
Feb 4, 2021·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Christophe LucchesiPierre-Olivier Chapuis
Feb 11, 2021·Reports on Progress in Physics·Jinlin SongRun Hu
Aug 5, 2021·Nature Communications·Bo ZhaoShanhui Fan

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