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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 4 — Feb. 14, 2011
  • pp: 3612–3618

Fractal plasmonics: subdiffraction focusing and broadband spectral response by a Sierpinski nanocarpet

Giorgio Volpe, Giovanni Volpe, and Romain Quidant  »View Author Affiliations

Optics Express, Vol. 19, Issue 4, pp. 3612-3618 (2011)

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Plasmonic nanostructures offer a great potential to enhance light-matter interaction at the nanometer scale. The response upon illumination at a given wavelength and polarization is governed by the characteristic lengths associated to the shape and size of the nanostructure. Here, we propose the use of engineered fractal plasmonic structures to extend the degrees of freedom and the parameters available for their design. In particular, we focus on a paradigmatic fractal geometry, namely the Sierpinski carpet. We explore the possibility of using it to achieve a controlled broadband spectral response by controlling the degree of its fractal complexity. Furthermore, we investigate some other arising properties, such as subdiffraction limited focusing and its potential use for optical trapping of nano-objects. An attractive advantage of the focusing over more standard geometries, such as gap antennas, is that it occurs away from the metal surface (≈ 80nm) at the center of the nanostructure, leaving an open space accessible to objects for enhanced light-matter interaction.

© 2011 Optical Society of America

OCIS Codes
(240.0240) Optics at surfaces : Optics at surfaces
(240.6690) Optics at surfaces : Surface waves
(260.6970) Physical optics : Total internal reflection

ToC Category:
Optics at Surfaces

Original Manuscript: January 10, 2011
Revised Manuscript: February 3, 2011
Manuscript Accepted: February 3, 2011
Published: February 9, 2011

Virtual Issues
Vol. 6, Iss. 3 Virtual Journal for Biomedical Optics

Giorgio Volpe, Giovanni Volpe, and Romain Quidant, "Fractal plasmonics: subdiffraction focusing and broadband spectral response by a Sierpinski nanocarpet," Opt. Express 19, 3612-3618 (2011)

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