Near-infrared broadband absorber with film-coupled multilayer nanorods
2013; Optica Publishing Group; Volume: 38; Issue: 13 Linguagem: Inglês
10.1364/ol.38.002247
ISSN1539-4794
AutoresXingxing Chen, Hanmo Gong, Shuowei Dai, Ding Zhao, Yuanqing Yang, Qiang Li, Min Qiu,
Tópico(s)Advanced Antenna and Metasurface Technologies
ResumoTurning the surfaces of noble metals (metasurfaces) into black (highly absorptive) surfaces can be potentially applied in thermophotovoltaics, sensing, tailoring thermal emissivity, etc. Here we demonstrate an extremely broadband absorber for the 900–1600 nm wavelength range with robust high absorption efficiency. The inexpensive droplet evaporation method is implemented to create patterns of nanoparticles dispersed on a gold film spaced by a thin dielectric layer. The diversity of the complicated random stacking of the chemically synthesized gold nanorods is the major factor for the broad absorption band. Such a metamaterial absorber may pave the way for cost-effective manufacture of large-area black metasurfaces.
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