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. 2019 Jan 10;10:109. doi: 10.1038/s41467-018-08047-3

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Thermal radiation properties. a Current–voltage (blue) curve of the hBN/graphene/hBN emitter. The red curve corresponds to the electrical power that is applied to the graphene emitter. b Emission spectra of the graphene emitter at different V_DS voltages. The dashed reference blackbody emission spectra at 2000 K (blue), 1930 K (red), 1640 K (yellow), 1510 K (purple) serves to compare with the emission of the graphene emitter. c The emission spectra of the graphene emitter at polarization angles of ϕ = 0° (red) and ϕ = 90° (blue) with applied V_DS = 13 V. Inset shows the emission intensity with respect to ϕ at wavelengths of 1585 nm (cyan) and 1500 nm (purple)