Abstract
We present a broadband plasmonic metamaterial absorber in the infrared region based on localized surface plasmon polaritons (LSPPs). The unit cell of the proposed metamaterial absorber consists of a multi-cavity structure, in which absorption resonances can be tuned independently through the modification of the width and shift of metallic walls. In order to avoid the degeneration between two contiguous resonances, which dramatically reduces the bandwidth, we introduce a zigzag design rule to arrange the cavities within a compact unit. Thus, the possible number of resonances is greatly increased, enabling an ultrabroadband absorption. A broadband absorber is demonstrated with only a few-layer structure and it also has an incident-angle-insensitive feature. Our results have potential applications in photovoltaic devices, emitters, sensors, and camouflage systems.
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Acknowledgments
The authors thank Dr. Natesan Yogesh for carefully reading through this article and good suggestions. This work was supported by the Chinese Natural Science Foundation (Grant Nos. 61107049, 61275043), the Open Fund of Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology (Grant No. MN201112, Grant No. 201406), Shenzhen Kexin Ju funds (Grant No. JCYJ20140828163633988), and the Natural Science Foundation of SZU (Grant No. 201456).
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Xiao, D., Tao, K. & Wang, Q. Ultrabroadband Mid-infrared Light Absorption Based on a Multi-cavity Plasmonic Metamaterial Array. Plasmonics 11, 389–394 (2016). https://doi.org/10.1007/s11468-015-0062-8
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DOI: https://doi.org/10.1007/s11468-015-0062-8