"Digitally" addressable focusing of light into a subwavelength hot spot

Tsung-Sheng Kao, E. T.F. Rogers, J. Y. Ou, N. I. Zheludev*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


We show that a plasmonic metamaterial can act as a far-field to near-field transformer that focuses a free-space beam of light into a subwavelength energy hot spot at a prescribed location with a spot size only a small fraction of the wavelength. The hot spot position on the metamaterial can be prescribed and moved at will from one metamolecule of the array to another in a "digital" fashion simply by modulating the input phase profile, thus providing new opportunities for imaging and optical data processing.

Original languageEnglish
Pages (from-to)2728-2731
Number of pages4
JournalNano Letters
Issue number6
StatePublished - 13 Jun 2012


  • Light localization
  • coherent control
  • metamaterials
  • nanophotonics


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