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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 17 — Aug. 16, 2010
  • pp: 17684–17698

Tuning of narrow geometric resonances in Ag/Au binary nanoparticle arrays

Jia Li, Ying Gu, and Qihuang Gong  »View Author Affiliations

Optics Express, Vol. 18, Issue 17, pp. 17684-17698 (2010)

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We extend the coupled dipole method to a semianalytical method that can be applied with high efficiency and accuracy to metallic heterogeneous binary particle arrays. The spectrum of the binary structure that we propose, which is composed of alternating silver and gold spherical nanoparticles, is characterized by additional geometric resonances near diffraction orders that originate from the real periodicity (i.e., twice the interparticle distance). The new diffraction orders can force the induced polarization of the heterogeneous particles out of phase, so that light scattered from them interferes destructively, which leads to geometric resonances imposed by destructive interference. By varying the constituent particle sizes, both the width and intensity of the additional geometric resonances can be effectively tuned. In particular, the Fano profiles of the geometric resonances can be tuned and are inverted when the contrast in scattering capabilities of the two types of constituent particles changes. The extensive tunability of the binary structure makes itself highly desirable for design of plasmon-based chemical and biological sensors.

© 2010 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(230.4555) Optical devices : Coupled resonators

ToC Category:
Optics at Surfaces

Original Manuscript: June 18, 2010
Revised Manuscript: July 8, 2010
Manuscript Accepted: July 10, 2010
Published: August 2, 2010

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

Ying GU, Jia Li, and Qihuang Gong, "Tuning of narrow geometric resonances in Ag/Au binary nanoparticle arrays," Opt. Express 18, 17684-17698 (2010)

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