Near-ideal optical metamaterial absorbers with super-octave bandwidth

Jeremy A. Bossard, Lan Lin, Seokho Yun, Liu Liu, Douglas H. Werner, Theresa S. Mayer

Research output: Contribution to journalArticle

109 Scopus citations

Abstract

Nanostructured optical coatings with tailored spectral absorption properties are of interest for a wide range of applications such as spectroscopy, emissivity control, and solar energy harvesting. Optical metamaterial absorbers have been demonstrated with a variety of customized single band, multiple band, polarization, and angular configurations. However, metamaterials that provide near unity absorptivity with super-octave bandwidth over a specified optical wavelength range have not yet been demonstrated experimentally. Here, we show a broadband, polarization-insensitive metamaterial with greater than 98% measured average absorptivity that is maintained over a wide ±45 field-of-view for mid-infrared wavelengths between 1.77 and 4.81 μm. The nearly ideal absorption is realized by using a genetic algorithm to identify the geometry of a single-layer metal nanostructure array that excites multiple overlapping electric resonances with high optical loss across greater than an octave bandwidth. The response is optimized by substituting palladium for gold to increase the infrared metallic loss and by introducing a dielectric superstrate to suppress reflection over the entire band. This demonstration advances the state-of-the-art in high-performance broadband metamaterial absorbers that can be reliably fabricated using a single patterned layer of metal nanostructures.

Original languageEnglish (US)
Pages (from-to)1517-1524
Number of pages8
JournalACS nano
Volume8
Issue number2
DOIs
StatePublished - Feb 25 2014

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Near-ideal optical metamaterial absorbers with super-octave bandwidth'. Together they form a unique fingerprint.

  • Cite this

    Bossard, J. A., Lin, L., Yun, S., Liu, L., Werner, D. H., & Mayer, T. S. (2014). Near-ideal optical metamaterial absorbers with super-octave bandwidth. ACS nano, 8(2), 1517-1524. https://doi.org/10.1021/nn4057148