Black metals: optical absorbers

Stefan Lundgaard*, Soon Hock Ng, Yoshiaki Nishijima, Michael Mazilu*, Saulius Juodkazis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

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.
Original languageEnglish
Article number256
Number of pages10
JournalMicromachines
Volume11
Issue number3
DOIs
Publication statusPublished - 28 Feb 2020

Keywords

  • Metamaterial
  • Optical absorber
  • Thin-film optics

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