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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 14 — Jul. 5, 2010
  • pp: 14802–14811

Demonstration of scattering suppression in retardation-based plasmonic nanoantennas

Michael G. Nielsen, Anders Pors, Rasmus B. Nielsen, Alexandra Boltasseva, Ole Albrektsen, and Sergey I. Bozhevolnyi  »View Author Affiliations


Optics Express, Vol. 18, Issue 14, pp. 14802-14811 (2010)
http://dx.doi.org/10.1364/OE.18.014802


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Abstract

Modifications in scattering strength of and local field enhancement by retardation-based plasmonic nanoantennas when being transformed from straight nanorods to split-ring resonators are investigated experimentally. Scattering properties are characterized with linear reflection and extinction spectroscopy of nanoantenna arrays, whereas local field enhancements are evaluated for individual nanoantennas using two-photon-excited photoluminescence (TPL) microscopy. The linear and nonlinear optical characterizations reveal that the optical response of nanoantennas is determined by the interference of counter-propagating short-range surface plasmon polaritons (SR-SPP) and that the transformation of nanorods into split-rings by bending significantly influences the scattering strength. Importantly, strong suppression of scattering for the fundamental SR-SPP resonance is observed when the bend radius is decreased, a feature that is attributed to the decrease in the nanoantenna electric-dipole response when bending the nanorods. The experimental observations are corroborated with numerical simulations using the finite-element method.

© 2010 OSA

OCIS Codes
(190.0190) Nonlinear optics : Nonlinear optics
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(290.0290) Scattering : Scattering
(220.4241) Optical design and fabrication : Nanostructure fabrication
(070.5753) Fourier optics and signal processing : Resonators

ToC Category:
Optics at Surfaces

History
Original Manuscript: June 3, 2010
Manuscript Accepted: June 20, 2010
Published: June 25, 2010

Citation
Michael G. Nielsen, Anders Pors, Rasmus B. Nielsen, Alexandra Boltasseva, Ole Albrektsen, and Sergey I. Bozhevolnyi, "Demonstration of scattering suppression in retardation-based plasmonic nanoantennas," Opt. Express 18, 14802-14811 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-14-14802


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