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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 15 — Jul. 19, 2010
  • pp: 16120–16132

Light scattering, field localization and local density of states in co-axial plasmonic nanowires

Nate Lawrence and Luca Dal Negro  »View Author Affiliations

Optics Express, Vol. 18, Issue 15, pp. 16120-16132 (2010)

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Based on analytical scattering theory, we develop a multipolar expansion method to investigate systematically the near-field enhancement, far-field scattering and Local Density of States (LDOS) spectra in concentric metal-insulator-metal (MIM) cylindrical nanostructures, or coaxial plasmonic nanowires (CPNs). We demonstrate that these structures support distinctive plasmonic resonances with strongly reduced scattering in the far-field zone and significant electric field enhancement in deep sub-wavelength dielectric regions. Additionally, we study systematically the effects of geometrical parameters and dielectric index on the near-field and far-field plasmonic response of CPNs in the visible and near infrared spectral range. Finally, we demonstrate that CPNs provide a convenient approach for engineering strong (almost three orders of magnitude) LDOS enhancement in sub-wavelength dielectric gaps at multiple frequencies. These results enable the engineering of multiband optical detectors and CPNs-based light emitters with simultaneously enhanced excitation and emission rates for nanoplasmonics.

© 2010 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(290.4020) Scattering : Mie theory
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Optics at Surfaces

Original Manuscript: May 26, 2010
Revised Manuscript: June 17, 2010
Manuscript Accepted: June 17, 2010
Published: July 15, 2010

Nate Lawrence and Luca Dal Negro, "Light scattering, field localization and local density of states in co-axial plasmonic nanowires," Opt. Express 18, 16120-16132 (2010)

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