Metamaterial filter for the near-visible spectrum

Research output: Contribution to journalArticlepeer-review


  • Haider Butt
  • Qing Dai
  • Niraj N. Lal
  • Timothy D. Wilkinson
  • Jeremy J. Baumberg
  • Gehan A J Amaratunga

Colleges, School and Institutes

External organisations

  • Lot 14, Zone A, EPZ
  • University of Cambridge
  • Department of Chemical Engineering
  • Sri Lanka Institute of Nanotechnology (SLINTEC)
  • Nanophotonics Centre
  • Cavendish Laboratory
  • EPZ


We demonstrate metamaterials operating in the near-visible regime based on two-dimensional arrays of gold-coated silicon nanopillars. The nanopillar arrays demonstrate a cutoff response at the metamaterial plasma frequency in accordance with theory and can be utilized for filtering applications. A plasma frequency in the near visible region of λ = 1 μm is calculated numerically for an array with a lattice constant of 300 nm and wire radius of 50 nm, with reflection measurements in agreement with numerical calculations. Such structures can be utilized for achieving negative-index based metamaterials for the visible spectrum. © 2012 American Institute of Physics.


Original languageEnglish
Article number083106
JournalApplied Physics Letters
Issue number8
Publication statusPublished - 20 Aug 2012

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