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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 21 — Oct. 10, 2011
  • pp: 21081–21090

Plasmon-enhanced depolarization of reflected light from arrays of nanoparticle dimers

Gary F. Walsh, Carlo Forestiere, and Luca Dal Negro  »View Author Affiliations

Optics Express, Vol. 19, Issue 21, pp. 21081-21090 (2011)

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Using spectroscopic ellipsometry and analytical multiple scattering theory, we demonstrate significant depolarization of far-field reflected light due to plasmonic near-field concentration in dimer arrays of metallic nanoparticles fabricated by electron beam lithography. By systematically investigating dimer arrays with varying sub-wavelength interparticle separations, we show that the measured depolarization presents a sharp peak at the Rayleigh cutoff condition for efficient in-plane diffraction. Moreover, by investigating the depolarization of reflected light as a function of the excitation angle, we demonstrate that maximum depolarization occurs in the spectral regions of plasmon-enhanced near-fields. Our results demonstrate that far-field reflection measurements encode information on the near-field spectra of complex nanoparticle arrays, and can be utilized to experimentally determine the optimal conditions for the excitation of sub-wavelength plasmonic resonances. The proposed approach opens novel opportunities for the engineering of nanoparticle arrays with optimized enhancement of optical cross sections for spectroscopic and sensing applications.

© 2011 OSA

OCIS Codes
(240.5770) Optics at surfaces : Roughness
(240.6680) Optics at surfaces : Surface plasmons
(240.6690) Optics at surfaces : Surface waves
(290.5855) Scattering : Scattering, polarization
(050.6624) Diffraction and gratings : Subwavelength structures
(240.2130) Optics at surfaces : Ellipsometry and polarimetry

ToC Category:
Optics at Surfaces

Original Manuscript: August 16, 2011
Revised Manuscript: September 20, 2011
Manuscript Accepted: September 20, 2011
Published: October 7, 2011

Virtual Issues
Vol. 6, Iss. 11 Virtual Journal for Biomedical Optics

Gary F. Walsh, Carlo Forestiere, and Luca Dal Negro, "Plasmon-enhanced depolarization of reflected light from arrays of nanoparticle dimers," Opt. Express 19, 21081-21090 (2011)

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