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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 15 — Jul. 29, 2013
  • pp: 17435–17446

Broadband subwavelength focusing of light using a passive sink

Heeso Noh, Sébastien M. Popoff, and Hui Cao  »View Author Affiliations

Optics Express, Vol. 21, Issue 15, pp. 17435-17446 (2013)

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Optical absorption is usually considered deleterious, something to avoid if at all possible. We propose a broadband nanoabsorber that completely eliminates the diffracting wave, resulting in a subwavelength enhancement of the field. Broadband operation is made possible by engineering the dispersion of the complex dielectric function. The local enhancement can be significantly improved compared to the standard plane wave illumination of a metallic nanoparticle. Our numerical simulation shows that an optical pulse as short as 6 fs can be focused to a 11 nm region. Not only the local field, but also its gradient are greatly enhanced, pointing to applications in ultrafast nonlinear spectroscopy, sensing and communication with deep-subwavelength resolution.

© 2013 OSA

OCIS Codes
(030.0030) Coherence and statistical optics : Coherence and statistical optics
(240.0240) Optics at surfaces : Optics at surfaces

ToC Category:
Optics at Surfaces

Original Manuscript: March 21, 2013
Revised Manuscript: June 11, 2013
Manuscript Accepted: June 27, 2013
Published: July 15, 2013

Heeso Noh, Sébastien M. Popoff, and Hui Cao, "Broadband subwavelength focusing of light using a passive sink," Opt. Express 21, 17435-17446 (2013)

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