Ultrabroadband light absorption by a sawtooth anisotropic metamaterial slab

Yanxia Cui, Kin Hung Fung, Jun Xu, Hyungjin Ma, Yi Jin, Sailing He, Nicholas X. Fang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

776 Citations (Scopus)


We present an ultrabroadband thin-film infrared absorber made of sawtoothed anisotropic metamaterial. Absorptivity of higher than 95% at normal incidence is supported in a wide range of frequencies, where the full absorption width at half-maximum is about 86%. Such property is retained well at a very wide range of incident angles too. Light of shorter wavelengths are harvested at upper parts of the sawteeth of smaller widths, while light of longer wavelengths are trapped at lower parts of larger tooth widths. This phenomenon is explained by the slowlight modes in anisotropic metamaterial waveguide. Our study can be applied in the field of designing photovoltaic devices and thermal emitters.
Original languageEnglish
Pages (from-to)1443-1447
Number of pages5
JournalNano Letters
Issue number3
Publication statusPublished - 14 Mar 2012
Externally publishedYes


  • absorber
  • anisotropic
  • metamaterials
  • Slow light
  • thin film
  • ultrabroadband

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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