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论文类型：期刊论文

发表时间：2019-02-06

发表刊物：ACS APPLIED MATERIALS & INTERFACES

收录刊物：PubMed、EI、SCIE

卷号：11

期号：5

页面范围：5176-5182

ISSN号：1944-8244

关键字：perfect absorption; chalcogenide; surface plasmon resonance; phase change material; metamaterials

摘要：Perfect absorbers that can efficiently absorb electromagnetic waves over a broad spectral range are crucial for energy harvesting, light detection, and optical camouflage. Recently, perfect absorbers based on a metasurface have attracted intensive attention. However, high-performance metasurface absorbers in the visible spectra require strict fabrication tolerances, and this is a formidable challenge. Moreover, fabricating subwavelength meta-atoms requires a top-down approach, thus limiting their scalability and spectral applicability. Here, we introduce a plasmonic nearly perfect absorber that exhibits a measured polarization-insensitive absorptance of similar to 92% across the spectral region from 400 to 1000 nm. The absorber is realized via a one-step self-assembly deposition of SO nm gold (Au) nanoparticle (NP) clusters onto a 35 nm-thick Ge2Sb2Te5 (GST225) chalcogenide film. An excellent agreement between the measured and theoretically simulated absorptance was found. The coalescence of the lossy GST225 dielectric layer and high density of localized surface plasmon resonance modes induced by the randomly distributed Au NPs play a vital role in obtaining the nearly perfect absorptance. The exceptionally high absorptance together with large-area high-throughput self-assembly fabrication demonstrates their potential for industrial-scale manufacturability and consequential widespread applications in thermophotovoltaics, photodetection, and sensing.