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Black Metals: Optical Absorbers

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
Melbourne Centre for Nanofabrication, the Victorian Node of the Australian National Fabrication Facility, 151 Wellington Rd., Clayton, 3168 VIC, Australia
Department of Electrical and Computer Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
Institute of Advanced Sciences, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, UK
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;
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.

AMA Style

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

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.

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