title: Automatically acquired broadband plasmonic-metamaterial black absorber during the metallic film-formation.
abstract: Broadband electromagnetic wave absorbers are highly desirable in numerous applications such as solar-energy harvesting, thermo-photovoltaics, and photon detection. The aim to efficiently achieve ultrathin broadband absorbers with high-yield and low-cost fabrication process has long been pursued. Here, we theoretically propose and experimentally demonstrate a unique broadband plasmonic-metamaterial absorber by utilizing a sub-10 nm meta-surface film structure to replace the precisely designed metamaterial crystal in the common metal-dielectric-metal absorbers. The unique ultrathin meta-surface can be automatically obtained during the metal film formation process. Spectral bandwidth with absorbance above 80% is up to 396 nm, where the full absorption width at half-maximum is about 92%. The average value of absorbance across the whole spectral range of 370-880 nm reaches 83%. These super absorption properties can be attributed to the particle plasmon resonances and plasmon near-field coupling by the automatically formed metallic nanoparticles as well as the plasmon polaritons of the metal film with the induced plasmonic magnetic resonances occurring between the top meta-surface and the bottom metal mirror. This method is quite simple, cost-effective for large-area fabrication, and compatible with current industrial methods for microelectro-mechanical systems, which makes it an outstanding candidate for advanced high-efficiency absorber materials.
authors: Laboratory of Nanomaterials and Sensors, College of Physics and Communication Electronics, Provincial Key Laboratory of Optoelectronic and Telecommunication, Jiangxi Normal University , Nanchang 330022, China.
authors: Zhengqi
authors: Z
authors: Liu
authors: Xiaoshan
authors: X
authors: Liu
authors: Shan
authors: S
authors: Huang
authors: Pingping
authors: P
authors: Pan
authors: Jing
authors: J
authors: Chen
authors: Guiqiang
authors: G
authors: Liu
authors: Gang
authors: G
authors: Gu
keywords: deposition; metal film formation; particle plasmon resonances; plasmon near-field coupling; plasmonic-metamaterial absorber