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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 12 — Jun. 6, 2011
  • pp: 11034–11051

Dark and bright localized surface plasmons in nanocrosses

Niels Verellen, Pol Van Dorpe, Dries Vercruysse, Guy A. E. Vandenbosch, and Victor V. Moshchalkov  »View Author Affiliations


Optics Express, Vol. 19, Issue 12, pp. 11034-11051 (2011)
http://dx.doi.org/10.1364/OE.19.011034


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Abstract

A metallic nanocross geometry sustaining broad dipole and sharp higher order localized surface plasmon resonances is investigated. Spectral tunability is achieved by changing the cross arm length and the angle between the arms. The degree of rotational symmetry of the nanocross is varied by adding extra arms, changing the arm angle and shifting the arm intersection point. The particle’s symmetry is shown to have a crucial influence on the plasmon coupling to incident radiation. Pronounced dipole, quadrupole, octupole and Fano resonances are observed in individual cross structures. Furthermore, the nanocross geometry proves to be a useful building block for coherently coupled plasmonic dimers and trimers where the reduced symmetry results in hybridized subradiant and superradiant modes and multiple Fano interferences. Finite difference time domain calculations of absorption and scattering cross-sections as well as charge density profiles are used to reveal the nature of the different plasmon modes. Experimental spectra for the discussed geometries support the calculations.

© 2011 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.3160) Physical optics : Interference
(290.5850) Scattering : Scattering, particles
(300.3700) Spectroscopy : Linewidth
(250.5403) Optoelectronics : Plasmonics
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optics at Surfaces

History
Original Manuscript: March 2, 2011
Revised Manuscript: April 2, 2011
Manuscript Accepted: April 4, 2011
Published: May 23, 2011

Citation
Niels Verellen, Pol Van Dorpe, Dries Vercruysse, Guy A. E. Vandenbosch, and Victor V. Moshchalkov, "Dark and bright localized surface plasmons in nanocrosses," Opt. Express 19, 11034-11051 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-12-11034


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