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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 27, Iss. 9 — Sep. 1, 2010
  • pp: 1819–1827

Metallic nanorod arrays: negative refraction and optical properties explained by retarded dipolar interactions

René Kullock, Stefan Grafström, Paul R. Evans, Robert J. Pollard, and Lukas M. Eng  »View Author Affiliations


JOSA B, Vol. 27, Issue 9, pp. 1819-1827 (2010)
http://dx.doi.org/10.1364/JOSAB.27.001819


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Abstract

We show that the optical properties of arrays of parallel-aligned metallic nanorods can be understood by means of a retarded dipolar interaction model. Exemplarily, arrays of gold nanorods having various lengths and diameters are investigated experimentally. A strong diameter dependence of the long-axis surface plasmon resonance (LSPR) as well as a lower energy limit of this mode for varying length was found. The model also shows that, for small nanorod distances ( d < λ / 2 ) , the optical properties are independent of the azimuthal angle of the incoming plane wave and of the detailed arrangement of the nanorods. Furthermore, the model was used to explain the dependence of the LSPR on the angle of incidence and to find the conditions for which negative and extraordinary positive refractions occur in these structures.

© 2010 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(290.2200) Scattering : Extinction
(160.3918) Materials : Metamaterials

ToC Category:
Physical Optics

History
Original Manuscript: May 5, 2010
Manuscript Accepted: June 27, 2010
Published: August 13, 2010

Virtual Issues
Vol. 5, Iss. 13 Virtual Journal for Biomedical Optics

Citation
René Kullock, Stefan Grafström, Paul R. Evans, Robert J. Pollard, and Lukas M. Eng, "Metallic nanorod arrays: negative refraction and optical properties explained by retarded dipolar interactions," J. Opt. Soc. Am. B 27, 1819-1827 (2010)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-27-9-1819

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