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• W4384346260 abstract "A classical thermal source, such as an incandescent filament, radiates according to Planck's law. The feasibility of super-Planckian radiation has been investigated with sub-wavelength-sized sources in the last decade. In such sources, a crystal-dependent coupling of photons and optical phonons is possible at thermal energies corresponding to that at room temperature. This interaction can be used to tailor the far-field thermal emission in a coherent manner; however, understanding heat transfer during this process is still nascent. Here, we used a novel measurement platform to quantify thermal signals in a Ge2Sb2Te5/SiO2 nanoribbon structure. We were able to separate and quantify the radiated and conducted heat transfer mechanisms. The thermal emission from the Ge2Sb2Te5/SiO2 nanoribbons was enhanced by 3.5× compared to that of a bare SiO2 nanoribbon. Our model revealed that this enhancement was directly due to polaritonic heat transfer, which was possible due to the large and lossless dielectric permittivity of Ge2Sb2Te5 at mid-IR frequencies. This study directly probes the far-field emission with a thermal gradient stimulated by Joule heating in temperature ranges from 100 to 400 K, which bridges the gap between mid-IR optics and thermal engineering." @default.
• W4384346260 created "2023-07-15" @default.
• W4384346260 creator A5022209577 @default.
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• W4384346260 date "2023-01-01" @default.
• W4384346260 modified "2023-10-13" @default.
• W4384346260 title "Enhanced far-field coherent thermal emission using mid-infrared bilayer metasurfaces" @default.
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• W4384346260 doi "https://doi.org/10.1039/d3nr02079g" @default.
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• W4384346260 hasPublicationYear "2023" @default.
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