Extremely broadband ultralight thermally-emissive optical coatings
| Autor: | Dennis M. Callahan, Ali Naqavi, Emily C. Warmann, Tatiana G. Vinogradova, Nina Vaidya, Jing-Shun Huang, Samuel P. Loke, Harry A. Atwater, Tom Tiwald, Tatiana A. Roy, Pilar Espinet-Gonzalez, Michael D. Kelzenberg |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
business.industry Infrared 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Flexible electronics Outgassing Optics Optical coating Thermal radiation Thermal insulation 0103 physical sciences Emissivity Thin film 010306 general physics 0210 nano-technology business |
| Popis: | We report the design, fabrication, and characterization of ultralight highly emissive structures with a record-low mass per area that emit thermal radiation efficiently over a broad spectral (2 to 30 microns) and angular (0-60°) range. The structures comprise one to three pairs of alternating metallic and dielectric thin films and have measured effective 300 K hemispherical emissivity of 0.7 to 0.9 (inferred from angular measurements which cover a bandwidth corresponding to 88% of 300K blackbody power). To our knowledge, these micron-scale-thickness structures, are the lightest reported optical coatings with comparable infrared emissivity. The superior optical properties, together with their mechanical flexibility, low outgassing, and low areal mass, suggest that these coatings are candidates for thermal management in applications demanding of ultralight flexible structures, including aerospace applications, ultralight photovoltaics, lightweight flexible electronics, and textiles for thermal insulation. |
| Databáze: | OpenAIRE |
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