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Article

Black Metals: Optical Absorbers

1
Optical Sciences Centre and ARC Training Centre in Surface Engineering for Advanced Materials (SEAM), School of Science, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
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Melbourne Centre for Nanofabrication, the Victorian Node of the Australian National Fabrication Facility, 151 Wellington Rd., Clayton, 3168 VIC, Australia
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Department of Electrical and Computer Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
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Institute of Advanced Sciences, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
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SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, UK
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Tokyo Tech World Research Hub Initiative (WRHI), School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
*
Authors to whom correspondence should be addressed.
Micromachines 2020, 11(3), 256; https://doi.org/10.3390/mi11030256
Received: 10 February 2020 / Revised: 26 February 2020 / Accepted: 26 February 2020 / Published: 28 February 2020
(This article belongs to the Special Issue Micro/Nano-surfaces: Fabrication and Applications)
We demonstrate a concept and fabrication of lithography-free layered metal-SiO2 thin-film structures which have reduced reflectivity (black appearance), to as low as 0.9%, with 4.9% broadband reflectance (8.9% for soda lime) in the 500–1400 nm range. The multi-layered (four layers) thin-film metamaterial is designed so that optical impedance matching produces minimal reflectance and transmittance within the visible and infra-red (IR) spectral region for a range of incident angles. The structure has enhanced absorbance and is easily tuned for reduced minimal transmission and reflection. This approach should allow for novel anti-reflection surfaces by impedance matching to be realized. View Full-Text
Keywords: metamaterial; optical absorber; thin-film optics metamaterial; optical absorber; thin-film optics
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MDPI and ACS Style

Lundgaard, S.; Ng, S.H.; Nishijima, Y.; Mazilu, M.; Juodkazis, S. Black Metals: Optical Absorbers. Micromachines 2020, 11, 256. https://doi.org/10.3390/mi11030256

AMA Style

Lundgaard S, Ng SH, Nishijima Y, Mazilu M, Juodkazis S. Black Metals: Optical Absorbers. Micromachines. 2020; 11(3):256. https://doi.org/10.3390/mi11030256

Chicago/Turabian Style

Lundgaard, Stefan, Soon H. Ng, Yoshiaki Nishijima, Michael Mazilu, and Saulius Juodkazis. 2020. "Black Metals: Optical Absorbers" Micromachines 11, no. 3: 256. https://doi.org/10.3390/mi11030256

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