Black Metals: Optical Absorbers

Stefan Lundgaard; Soon Hock Ng; Yoshiaki Nishijima; Michael Mazilu; Saulius Juodkazis

Working Paper Article Version 1 This version is not peer-reviewed

Version 1 : Received: 10 February 2020 / Approved: 11 February 2020 / Online: 11 February 2020 (09:26:01 CET)

We demonstrate a concept and fabrication of lithography-free layered metal-\ce{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.

metalmaterial; optical absorber; thin-film optics

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Black Metals: Optical Absorbers

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