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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 21 — Oct. 10, 2011
  • pp: 20865–20875

Nanoscale subsurface- and material-specific identification of single nanoparticles

Zachary Nuño, Brandon Hessler, Jerry Ochoa, Young-Seok Shon, Codi Bonney, and Yohannes Abate  »View Author Affiliations

Optics Express, Vol. 19, Issue 21, pp. 20865-20875 (2011)

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We report on high resolution subsurface and material specific differentiation of silica, Au and silica-capped Au nanoparticles using scattering-type scanning near-field optical microscopy (s-SNOM) in the visible (λ=633 nm) and mid-infrared (λ=10.7 μm) frequencies. Strong optical contrast is observed in the visible wavelength, mainly because of the dipolar plasmon resonance of the embedded Au nanoparticles which is absent in the infrared. We show that the use of small tapping amplitude improves the apparent image contrast in nanoparticles by causing increased tip-particle and reduced tip-substrate interactions. Experimental results are in excellent agreement with extended dipole model calculations modified to include the capping layer characterized by its refractive index.

© 2011 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(160.4236) Materials : Nanomaterials
(180.4243) Microscopy : Near-field microscopy

ToC Category:
Optics at Surfaces

Original Manuscript: June 22, 2011
Revised Manuscript: August 21, 2011
Manuscript Accepted: August 28, 2011
Published: October 5, 2011

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

Zachary Nuño, Brandon Hessler, Jerry Ochoa, Young-Seok Shon, Codi Bonney, and Yohannes Abate, "Nanoscale subsurface- and material-specific identification of single nanoparticles," Opt. Express 19, 20865-20875 (2011)

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