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Verlagslink DOI: 10.1038/ncomms11809
Titel: Controlling thermal emission with refractory epsilon-near-zero metamaterials via topological transitions
Sprache: English
Autor/Autorin: Dyachenko, Pavel N. 
Molesky, Sean 
Petrov, Alexander 
Störmer, Michael 
Krekeler, Tobias 
Lang, Slawa 
Ritter, Martin 
Jacob, Zubin 
Eich, Manfred 
Erscheinungsdatum: 6-Jun-2016
Verlag: Nature Publishing Group UK
Quellenangabe: Nature communications 7: 11809 (2016)
Zeitschrift oder Schriftenreihe: Nature communications 
Zusammenfassung (englisch): Control of thermal radiation at high temperatures is vital for waste heat recovery and for high-efficiency thermophotovoltaic (TPV) conversion. Previously, structural resonances utilizing gratings, thin film resonances, metasurfaces and photonic crystals were used to spectrally control thermal emission, often requiring lithographic structuring of the surface and causing significant angle dependence. In contrast, here, we demonstrate a refractory W-HfO2 metamaterial, which controls thermal emission through an engineered dielectric response function. The epsilon-near-zero frequency of a metamaterial and the connected optical topological transition (OTT) are adjusted to selectively enhance and suppress the thermal emission in the near-infrared spectrum, crucial for improved TPV efficiency. The near-omnidirectional and spectrally selective emitter is obtained as the emission changes due to material properties and not due to resonances or interference effects, marking a paradigm shift in thermal engineering approaches. We experimentally demonstrate the OTT in a thermally stable metamaterial at high temperatures of 1,000 °C.
URI: http://tubdok.tub.tuhh.de/handle/11420/1623
DOI: 10.15480/882.1620
ISSN: 2041-1723
Institut: Optische und Elektronische Materialien E-12 
Dokumenttyp: (wissenschaftlicher) Artikel
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