Journal
INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING
Volume 4, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/2631-7990/ac3bb1
Keywords
mid-infrared; wideband; perfect thermal radiation; surface plasmon resonance; metasurface; nanocavity
Funding
- National Key Research and Development Program of China [2019YFA0709100, 2020YFA0714504]
- Fundamental Research Funds for the Central Universities [DUT20GF108, DUT20RC(3)007, DUT20RC(3)062, DUT19RC(3)010]
- Program for Liaoning excellent Talents in University [LJQ2015021]
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Researchers have developed a broadband mid-infrared thermal emitter using stacked nanocavity metasurfaces, which can absorb a wide range of polarized light and achieve high thermal radiation in the 8-14 μm atmospheric window.
Efficient thermal radiation in the mid-infrared (M-IR) region is of supreme importance for many applications including thermal imaging and sensing, thermal infrared light sources, infrared spectroscopy, emissivity coatings, and camouflage. The ability to control light makes metasurfaces an attractive platform for infrared applications. Recently, different metamaterials have been proposed to achieve high thermal radiation. To date, broadening the radiation bandwidth of a metasurface emitter (meta-emitter) has become a key goal to enable extensive applications. We experimentally demonstrate a broadband M-IR thermal emitter using stacked nanocavity metasurface consisting of two pairs of circular-shaped dielectric (Si3N4)-metal (Au) stacks. A high thermal radiation can be obtained by engineering the geometry of nanocavity metasurfaces. Such a meta-emitter provides wideband and broad angular absorptance of both p- and s-polarized light, offering a wideband thermal radiation with an average emissivity of more than 80% in the M-IR atmospheric window of 8-14 mu m. The experimental illustration together with the theoretical framework establishes a basis for designing broadband thermal emitters, which, as anticipated, will initiate a promising avenue to M-IR sources.
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