Journal
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
Volume 200, Issue -, Pages 100-107Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jqsrt.2017.06.010
Keywords
Thermal modulator; Van der Waals materials; Hexagonal Boron Nitride; Hyperbolic surface phonon polaritons; Near-field radiative transfer
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Funding
- National Natural Science Foundation of China [51590901]
- Foundation of Key Laboratory of Thermo Fluid Science and Engineering (Xi'an Jiaotong University) [KLTFSE2016KF03]
- Foundation of Key Laboratory of Thermo Fluid Science and Engineering (Ministry of Education) [KLTFSE2016KF03]
- Fundamental Research Funds for the Central Universities [56XIA17001]
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Modulating heat flux provides a platform for a plethora of emerging devices such as thermal diodes, thermal transistors, and thermal memories. Here, a pattern-free noncontact thermal modulator is proposed based on the mechanical rotation between two Van der Waals films with optical axes parallel to the surfaces. A modulation contrast can reach a value higher than 5 for hexagonal Boron Nitride (hBN) films separated by a nanoscale gap distance. The dominant radiative heat exchange comes from the excitation of both Type I and Type II hyperbolic surface phonon polaritons (HSPhPs) at the vacuum-hBN interface for different orientations, while the large modulation contrast is mainly attributed to the mismatching Type I HSPhPs induced by rotation. This work opens the possibility to design cheap thermal modulators without relying on nanofabrication techniques, and paves the way to apply natural Van der Waals materials in manipulating heat currents in an active way. (C) 2017 Elsevier Ltd. All rights reserved.
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